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Zimmer EA, Berg JA, Dudash MR. Genetic diversity and population structure among native, naturalized, and invasive populations of the common yellow monkeyflower, Mimulus guttatus (Phrymaceae). Ecol Evol 2023; 13:e9596. [PMID: 37038527 PMCID: PMC10082173 DOI: 10.1002/ece3.9596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 03/01/2022] [Accepted: 03/28/2022] [Indexed: 04/12/2023] Open
Abstract
An ongoing controversy in invasion biology is the prevalence of colonizing plant populations that are able to establish and spread, while maintaining limited amounts of genetic variation. Invasive populations can be established through several routes including from a single source or from multiple introductions. The aim of this study was to examine genetic diversity in populations of Mimulus guttatus in the United Kingdom, where the species is considered invasive, and compare this diversity to that in native populations on the west coast of North America. Additionally, we looked at diversity in non-native populations that have not yet become invasive (naturalized populations) in eastern North America. We investigated population structure among populations in these three regions and attempted to uncover the sources for populations that have established in the naturalized and invasive regions. We found that genetic diversity was, on average, relatively high in populations from the invasive UK region and comparable to native populations. Contrastingly, two naturalized M. guttatus populations were low in both genetic and genotypic diversity, indicating a history of asexual reproduction and self-fertilization. A third naturalized population was found to be a polyploid Mimulus hybrid of unknown origin. Our results demonstrate that M. guttatus has likely achieved colonization success outside of its native western North America distribution by a variety of establishment pathways, including those with genetic and demographic benefits resulting from multiple introductions in the UK, reproductive assurance through selfing, and asexual reproduction in eastern North America, and possible polyploidization in one Canadian population.
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Affiliation(s)
- Elizabeth A. Zimmer
- Department of Botany and Laboratories of Analytical Biology, National Museum of Natural HistorySmithsonian InstitutionWashingtonDistrict of ColumbiaUSA
| | - Jason A. Berg
- Department of Biological SciencesUniversity of MarylandCollege ParkMarylandUSA
| | - Michele R. Dudash
- Department of Biological SciencesUniversity of MarylandCollege ParkMarylandUSA
- Department of Natural Resource ManagementSouth Dakota State UniversityBrookingsSouth DakotaUSA
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2
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Development and characterization of 165 SNP markers in Mimosa bimucronata (Candolle) O. Kuntze. CONSERV GENET RESOUR 2023. [DOI: 10.1007/s12686-023-01297-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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3
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Vicente S, Máguas C, Richardson DM, Trindade H, Wilson JRU, Le Roux JJ. Highly diverse and highly successful: invasive Australian acacias have not experienced genetic bottlenecks globally. ANNALS OF BOTANY 2021; 128:149-157. [PMID: 33876193 PMCID: PMC8324033 DOI: 10.1093/aob/mcab053] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 04/15/2021] [Indexed: 05/04/2023]
Abstract
BACKGROUND AND AIMS Invasive species may undergo rapid evolution despite very limited standing genetic diversity. This so-called genetic paradox of biological invasions assumes that an invasive species has experienced (and survived) a genetic bottleneck and then underwent local adaptation in the new range. In this study, we test how often Australian acacias (genus Acacia), one of the world's most problematic invasive tree groups, have experienced genetic bottlenecks and inbreeding. METHODS We collated genetic data from 51 different genetic studies on Acacia species to compare genetic diversity between native and invasive populations. These studies analysed 37 different Acacia species, with genetic data from the invasive ranges of 11 species, and data from the native range for 36 species (14 of these 36 species are known to be invasive somewhere in the world, and the other 22 are not known to be invasive). KEY RESULTS Levels of genetic diversity are similar in native and invasive populations, and there is little evidence of invasive populations being extensively inbred. Levels of genetic diversity in native range populations also did not differ significantly between species that have and that do not have invasive populations. CONCLUSION We attribute our findings to the impressive movement, introduction effort and human usage of Australian acacias around the world.
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Affiliation(s)
- Sara Vicente
- Centro de Estudos do Ambiente e do Mar (CESAM), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Lisboa, Portugal
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Lisboa, Portugal
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
| | - Cristina Máguas
- Centre for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Lisboa, Portugal
| | - David M Richardson
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Stellenbosch, South Africa
| | - Helena Trindade
- Centro de Estudos do Ambiente e do Mar (CESAM), Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Lisboa, Portugal
| | - John R U Wilson
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Stellenbosch, South Africa
- South African National Biodiversity Institute, Kirstenbosch Research Centre, Cape Town, South Africa
| | - Johannes J Le Roux
- Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
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4
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Mairal M, Chown SL, Shaw J, Chala D, Chau JH, Hui C, Kalwij JM, Münzbergová Z, Jansen van Vuuren B, Le Roux JJ. Human activity strongly influences genetic dynamics of the most widespread invasive plant in the sub-Antarctic. Mol Ecol 2021; 31:1649-1665. [PMID: 34181792 DOI: 10.1111/mec.16045] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/14/2021] [Accepted: 06/21/2021] [Indexed: 11/26/2022]
Abstract
The link between the successful establishment of alien species and propagule pressure is well-documented. Less known is how humans influence the post-introduction dynamics of invasive alien populations. The latter requires studying parallel invasions by the same species in habitats that are differently impacted by humans. We analysed microsatellite and genome size variation, and then compared the genetic diversity and structure of invasive Poa annua L. on two sub-Antarctic islands: human-occupied Marion Island and unoccupied Prince Edward Island. We also carried out niche modelling to map the potential distribution of the species on both islands. We found high levels of genetic diversity and evidence for extensive admixture between genetically distinct lineages of P. annua on Marion Island. By contrast, the Prince Edward Island populations showed low genetic diversity, no apparent admixture, and had smaller genomes. On both islands, high genetic diversity was apparent at human landing sites, and on Marion Island, also around human settlements, suggesting that these areas received multiple introductions and/or acted as initial introduction sites and secondary sources (bridgeheads) for invasive populations. More than 70 years of continuous human activity associated with a meteorological station on Marion Island led to a distribution of this species around human settlements and along footpaths, which facilitates ongoing gene flow among geographically separated populations. By contrast, this was not the case for Prince Edward Island, where P. annua populations showed high genetic structure. The high levels of genetic variation and admixture in P. annua facilitated by human activity, coupled with high habitat suitability on both islands, suggest that P. annua is likely to increase its distribution and abundance in the future.
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Affiliation(s)
- Mario Mairal
- Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa.,Departamento de Biodiversidad, Ecología y Evolución, Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, Ciudad Universitaria, Madrid, Spain
| | - Steven L Chown
- Securing Antarctica's Environmental Future, School of Biological Sciences, Monash University, Victoria, Australia
| | - Justine Shaw
- School of Biological Sciences, The University of Queensland, St Lucia, Queensland, Australia
| | - Desalegn Chala
- Natural History Museum, University of Oslo, Oslo, Norway
| | - John H Chau
- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, University of Johannesburg, Auckland Park, South Africa
| | - Cang Hui
- Centre for Invasion Biology, Department of Mathematical Sciences, Stellenbosch University, Stellenbosch, South Africa.,Biodiversity Informatics Unit, African Institute for Mathematical Sciences, Cape Town, South Africa
| | - Jesse M Kalwij
- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, University of Johannesburg, Auckland Park, South Africa.,Institute of Geography and Geoecology, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Zuzana Münzbergová
- Department of Botany, Charles University, Prague, Czech Republic.,Department of Population Ecology, Czech Academy of Science, Průhonice, Czech Republic
| | - Bettine Jansen van Vuuren
- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, University of Johannesburg, Auckland Park, South Africa
| | - Johannes J Le Roux
- Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa.,Department of Biological Sciences, Macquarie University, Sydney, New South Wales, Australia
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5
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Mérel V, Gibert P, Buch I, Rada VR, Estoup A, Gautier M, Fablet M, Boulesteix M, Vieira C. The worldwide invasion of Drosophila suzukii is accompanied by a large increase of transposable element load and a small number of putatively adaptive insertions. Mol Biol Evol 2021; 38:4252-4267. [PMID: 34021759 PMCID: PMC8476158 DOI: 10.1093/molbev/msab155] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Transposable Elements (TEs) are ubiquitous and mobile repeated sequences. They are major determinants of host fitness. Here, we characterized the TE content of the spotted wing fly Drosophila suzukii. Using a recently improved genome assembly, we reconstructed TE sequences de novo, and found that TEs occupy 47% of the genome and are mostly located in gene poor regions. The majority of TE insertions segregate at low frequencies, indicating a recent and probably ongoing TE activity. To explore TE dynamics in the context of biological invasions, we studied variation of TE abundance in genomic data from 16 invasive and six native populations of D. suzukii. We found a large increase of the TE load in invasive populations correlated with a reduced Watterson estimate of genetic diversity θ̂w a proxy of effective population size. We did not find any correlation between TE contents and bioclimatic variables, indicating a minor effect of environmentally induced TE activity. A genome-wide association study revealed that ca. 2,000 genomic regions are associated with TE abundance. We did not find, however, any evidence in such regions of an enrichment for genes known to interact with TE activity (e.g. transcription factor encoding genes or genes of the piRNA pathway). Finally, the study of TE insertion frequencies revealed 15 putatively adaptive TE insertions, six of them being likely associated with the recent invasion history of the species.
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Affiliation(s)
- Vincent Mérel
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Patricia Gibert
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Inessa Buch
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Valentina Rodriguez Rada
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Arnaud Estoup
- CBGP, Univ Montpellier, CIRAD, INRAE, Institut Agro, IRD, Montpellier, France
| | - Mathieu Gautier
- CBGP, Univ Montpellier, CIRAD, INRAE, Institut Agro, IRD, Montpellier, France
| | - Marie Fablet
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Matthieu Boulesteix
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
| | - Cristina Vieira
- Université de Lyon, Université Lyon 1, CNRS, Laboratoire de Biométrie et Biologie Evolutive UMR 5558, F-69622 Villeurbanne, France
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Dispersal history of a globally introduced carnivore, the small Indian mongoose Urva auropunctata, with an emphasis on the Caribbean region. Biol Invasions 2021. [DOI: 10.1007/s10530-021-02523-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Castillo ML, Schaffner U, van Wilgen BW, Montaño NM, Bustamante RO, Cosacov A, Mathese MJ, Le Roux JJ. Genetic insights into the globally invasive and taxonomically problematic tree genus Prosopis. AOB PLANTS 2021; 13:plaa069. [PMID: 33542801 PMCID: PMC7846124 DOI: 10.1093/aobpla/plaa069] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 12/07/2020] [Indexed: 05/25/2023]
Abstract
Accurate taxonomic identification of alien species is crucial to detect new incursions, prevent or reduce the arrival of new invaders and implement management options such as biological control. Globally, the taxonomy of non-native Prosopis species is problematic due to misidentification and extensive hybridization. We performed a genetic analysis on several Prosopis species, and their putative hybrids, including both native and non-native populations, with a special focus on Prosopis invasions in Eastern Africa (Ethiopia, Kenya and Tanzania). We aimed to clarify the taxonomic placement of non-native populations and to infer the introduction histories of Prosopis in Eastern Africa. DNA sequencing data from nuclear and chloroplast markers showed high homology (almost 100 %) between most species analysed. Analyses based on seven nuclear microsatellites confirmed weak population genetic structure among Prosopis species. Hybrids and polyploid individuals were recorded in both native and non-native populations. Invasive genotypes of Prosopis juliflora in Kenya and Ethiopia could have a similar native Mexican origin, while Tanzanian genotypes likely are from a different source. Native Peruvian Prosopis pallida genotypes showed high similarity with non-invasive genotypes from Kenya. Levels of introduced genetic diversity, relative to native populations, suggest that multiple introductions of P. juliflora and P. pallida occurred in Eastern Africa. Polyploidy may explain the successful invasion of P. juliflora in Eastern Africa. The polyploid P. juliflora was highly differentiated from the rest of the (diploid) species within the genus. The lack of genetic differentiation between most diploid species in their native ranges supports the notion that hybridization between allopatric species may occur frequently when they are co-introduced into non-native areas. For regulatory purposes, we propose to treat diploid Prosopis taxa from the Americas as a single taxonomic unit in non-native ranges.
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Affiliation(s)
- María L Castillo
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | | | - Brian W van Wilgen
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Noé Manuel Montaño
- Departamento de Biología, División de Ciencias Biológicas y de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, CP, Mexico City, Mexico
| | - Ramiro O Bustamante
- Departamento de Ciencias Ecológicas, Instituto de Ecología y Biodiversidad, Facultad de Ciencias, Universidad de Chile, CP, Santiago, Chile
| | - Andrea Cosacov
- Laboratorio de Ecología Evolutiva - Biología Floral, Instituto Multidisciplinario de Biología Vegetal IMBIV, CONICET-Universidad Nacional de Córdoba, Argentina, CP, Córdoba, Argentina
| | - Megan J Mathese
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
| | - Johannes J Le Roux
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Matieland, South Africa
- Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia
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8
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Hirsch H, Richardson DM, Pauchard A, Le Roux JJ. Genetic analyses reveal complex introduction histories for the invasive tree
Acacia dealbata
Link around the world. DIVERS DISTRIB 2020. [DOI: 10.1111/ddi.13186] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Affiliation(s)
- Heidi Hirsch
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
| | - David M. Richardson
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
| | - Aníbal Pauchard
- Laboratorio de Invasiones Biológicas Facultad de Ciencias Forestales Universidad de Concepción Concepción Chile
- Institute of Ecology and Biodiversity (IEB) Santiago Chile
| | - Johannes J. Le Roux
- Centre for Invasion Biology Department of Botany and Zoology Stellenbosch University Matieland South Africa
- Department of Biological Sciences Macquarie University Sydney NSW Australia
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9
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Wan J, Oduor AMO, Pouteau R, Wang B, Chen L, Yang B, Yu F, Li J. Can polyploidy confer invasive plants with a wider climatic tolerance? A test using Solidago canadensis. Ecol Evol 2020; 10:5617-5630. [PMID: 32607178 PMCID: PMC7319170 DOI: 10.1002/ece3.6303] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 03/25/2020] [Accepted: 03/30/2020] [Indexed: 02/05/2023] Open
Abstract
Polyploidy can cause variation in plant functional traits and thereby generate individuals that can adapt to fluctuating environments and exploit new environments. However, few empirical studies have tested for an association between ploidy level and climatic tolerance of invasive cytotypes relative to conspecific native-range cytotypes. Here, we used an invasive plant Solidago canadensis to test whether invasive populations had a higher proportion of polyploids, greater height and stem-base diameter, and occupied a wider range of climatic conditions than conspecific native-range populations. We also tested whether the invasive populations had overcome genetic founder effects. We sampled a total of 80 populations in parts of the invaded range in China and native range in North America for in situ measurements of plant height and stem-base diameter in the field and for population genetic and cytotype analyses. To examine climatic correlates, we augmented our field-sampled data with occurrence records obtained from Global Biodiversity Information Facility. All, except one, of the populations that we sampled in China occurred in a humid subtropical climate. In contrast, the North American populations occurred in humid continental, humid subtropical, and semi-arid climatic zones. All populations of S. canadensis in China were purely hexaploid, while the North American populations were diploid, tetraploid, and hexaploid. The invasive hexaploids were significantly taller and had a larger stem-base diameter than native hexaploids. Native hexaploids were significantly taller and had larger stem-base diameter than native diploids. Climatic correlate assessment found that invasive and native populations occupied different climatic envelopes, with invasive populations occurring in warmer and less seasonal climates than native populations. However, there was no significant correlation between ploidy level and climatic envelope of S. canadensis. Molecular phylogeography data suggest reduced genetic founder effects in the invaded range. Overall, these results suggest that polyploidy does not influence S. canadensis climatic tolerance.
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Affiliation(s)
- Jizhong Wan
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
- State Key Laboratory of Plateau Ecology and AgricultureQinghai UniversityXiningP.R. China
| | - Ayub M. O. Oduor
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
- Department of Applied BiologyTechnical University of KenyaNairobiKenya
| | - Robin Pouteau
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
| | - Beilei Wang
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
| | - Luxi Chen
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
| | - Beifen Yang
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
| | - Feihai Yu
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
| | - Junmin Li
- Zhejing Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhouP.R. China
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10
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Millar MA, Coates DJ, Byrne M, Krauss SL, Jonson J, Hopper SD. Assessment of genetic diversity and mating system of
Acacia cyclops
restoration and remnant populations. Restor Ecol 2019. [DOI: 10.1111/rec.13007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Melissa A. Millar
- Department of Biodiversity Conservation and AttractionsBiodiversity and Conservation Science, Locked Bag 104, Bentley Delivery Centre Bentley WA 6983 Australia
- School of Biological SciencesThe University of Western Australia, 35 Stirling Highway Crawley WA 6009 Australia
| | - David J. Coates
- Department of Biodiversity Conservation and AttractionsBiodiversity and Conservation Science, Locked Bag 104, Bentley Delivery Centre Bentley WA 6983 Australia
| | - Margaret Byrne
- Department of Biodiversity Conservation and AttractionsBiodiversity and Conservation Science, Locked Bag 104, Bentley Delivery Centre Bentley WA 6983 Australia
- School of Biological SciencesThe University of Western Australia, 35 Stirling Highway Crawley WA 6009 Australia
| | - Siegfried L. Krauss
- School of Biological SciencesThe University of Western Australia, 35 Stirling Highway Crawley WA 6009 Australia
- Department of Biodiversity, Conservation and AttractionsKings Park Science, Kattidj Close Kings Park WA 6005 Australia
| | - Justin Jonson
- Centre of Excellence in Natural Resource Management, School of Agriculture and EnvironmentThe University of Western Australia, 1 Foreshore House Albany WA 6330 Australia
| | - Stephen D. Hopper
- Centre of Excellence in Natural Resource ManagementThe University of Western Australia, 35 Stirling Terrace Albany WA 6330 Australia
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Hirsch H, Castillo ML, Impson FAC, Kleinjan C, Richardson DM, Le Roux JJ. Ghosts from the past: even comprehensive sampling of the native range may not be enough to unravel the introduction history of invasive species-the case of Acacia dealbata invasions in South Africa. AMERICAN JOURNAL OF BOTANY 2019; 106:352-362. [PMID: 30816998 DOI: 10.1002/ajb2.1244] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 12/19/2018] [Indexed: 06/09/2023]
Abstract
PREMISE OF THE STUDY Knowledge about the introduction history (source(s), number and size of introduction events) of an invasive species is a crucial prerequisite to understand invasion success and to facilitate effective and sustainable management approaches, especially for effective biological control. We investigated the introduction history of the Australian legume tree Acacia dealbata in South Africa. Results of this study will not only provide critical information for the management of this species in South Africa, but will also broaden our overall knowledge on the invasion ecology of this globally important invasive tree. METHODS We used nuclear microsatellite markers to compare the genetic diversity and structure between 42 native Australian and 18 invasive South African populations and to test different and competing introduction scenarios using Approximate Bayesian Computation analyses. KEY RESULTS Australian populations were characterized by two distinct genetic clusters, while South African populations lacked any clear genetic structure and showed significantly lower levels of genetic diversity compared to native range populations. South African populations were also genetically divergent from native populations and the most likely introduction scenario indicated an unknown source population. CONCLUSIONS Although we cannot definitely prove the cause of the observed genetic novelty/diversification in South African Acacia dealbata populations, it cannot be attributable to insufficient sampling of native populations. Our study highlights the complexity of unravelling the introduction histories of commercially important alien species.
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Affiliation(s)
- Heidi Hirsch
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Maria L Castillo
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Fiona A C Impson
- Plant Protection Research Institute, Private Bag X5017, Stellenbosch, 7599, South Africa
- Plant Conservation Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
| | - Catharina Kleinjan
- Plant Conservation Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa
| | - David M Richardson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
| | - Johannes J Le Roux
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland, 7602, South Africa
- Department of Biological Sciences, Macquarie University, Sydney, New South Wales, 2109, Australia
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12
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Magona N, Richardson DM, Le Roux JJ, Kritzinger-Klopper S, Wilson JRU. Even well-studied groups of alien species might be poorly inventoried: Australian Acacia species in South Africa as a case study. NEOBIOTA 2018. [DOI: 10.3897/neobiota.39.23135] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Understanding the status and extent of spread of alien plants is crucial for effective management. We explore this issue using Australian Acacia species (wattles) in South Africa (a global hotspot for wattle introductions and tree invasions). The last detailed inventory of wattles in South Africa was based on data collated forty years ago. This paper aimed to determine: 1) how many Australian Acacia species have been introduced to South Africa; 2) which species are still present; and 3) the status of naturalised taxa that might be viable targets for eradication. All herbaria in South Africa with specimens of introduced Australian Acacia species were visited and locality records were compared with records from literature sources, various databases, and expert knowledge. For taxa not already known to be widespread invaders, field surveys were conducted to determine whether plants are still present, and detailed surveys were undertaken of all naturalised populations. To confirm the putative identities of the naturalised taxa, we also sequenced one nuclear and one chloroplast gene. We found evidence that 141 Australian Acacia species have been introduced to South Africa (approximately double the estimate from previous work), but we could only confirm the current presence of 33 species. Fifteen wattle species are invasive (13 are in category E and two in category D2 in the Unified Framework for Biological Invasions); five have naturalised (C3); and 13 are present but there was no evidence that they had produced reproductive offspring (B2 or C1). DNA barcoding provided strong support for only 23 taxa (including two species not previously recorded from South Africa), the current name ascribed was not supported for three species and, for a further three species, there was no voucher specimen on GenBank against which their identity could be checked. Given the omissions and errors found during this systematic re-evaluation of historical records, it is clear that analyses of the type conducted here are crucial if the status of even well-studied groups of alien taxa is to be accurately determined.
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13
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Kamutando CN, Vikram S, Kamgan-Nkuekam G, Makhalanyane TP, Greve M, Roux JJL, Richardson DM, Cowan D, Valverde A. Soil nutritional status and biogeography influence rhizosphere microbial communities associated with the invasive tree Acacia dealbata. Sci Rep 2017; 7:6472. [PMID: 28747705 PMCID: PMC5529528 DOI: 10.1038/s41598-017-07018-w] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/20/2017] [Indexed: 01/08/2023] Open
Abstract
Invasiveness and the impacts of introduced plants are known to be mediated by plant-microbe interactions. Yet, the microbial communities associated with invasive plants are generally poorly understood. Here we report on the first comprehensive investigation of the bacterial and fungal communities inhabiting the rhizosphere and the surrounding bulk soil of a widespread invasive tree, Acacia dealbata. Amplicon sequencing data indicated that rhizospheric microbial communities differed significantly in structure and composition from those of the bulk soil. Two bacterial (Alphaproteobacteria and Gammaproteobacteria) and two fungal (Pezizomycetes and Agaricomycetes) classes were enriched in the rhizosphere compared with bulk soils. Changes in nutritional status, possibly induced by A. dealbata, primarily shaped rhizosphere soil communities. Despite a high degree of geographic variability in the diversity and composition of microbial communities, invasive A. dealbata populations shared a core of bacterial and fungal taxa, some of which are known to be involved in N and P cycling, while others are regarded as plant pathogens. Shotgun metagenomic analysis also showed that several functional genes related to plant growth promotion were overrepresented in the rhizospheres of A. dealbata. Overall, results suggest that rhizosphere microbes may contribute to the widespread success of this invader in novel environments.
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Affiliation(s)
- Casper N Kamutando
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Surendra Vikram
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Gilbert Kamgan-Nkuekam
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Thulani P Makhalanyane
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Michelle Greve
- Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa
| | - Johannes J Le Roux
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Stellenbosch, South Africa
| | - David M Richardson
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Stellenbosch, South Africa
| | - Don Cowan
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa
| | - Angel Valverde
- Centre for Microbial Ecology and Genomics, Department of Genetics, University of Pretoria, Pretoria, South Africa.
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Hirsch H, Richardson DM, Le Roux JJ. Introduction to the special issue: Tree invasions: towards a better understanding of their complex evolutionary dynamics. AOB PLANTS 2017; 9:plx014. [PMID: 28533897 PMCID: PMC5420828 DOI: 10.1093/aobpla/plx014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 04/03/2017] [Indexed: 06/07/2023]
Abstract
Many invasive plants show evidence of trait-based evolutionary change, but these remain largely unexplored for invasive trees. The increasing number of invasive trees and their tremendous impacts worldwide, however, illustrates the urgent need to bridge this knowledge gap to apply efficient management. Consequently, an interdisciplinary workshop, held in 2015 at Stellenbosch University in Stellenbosch, South Africa, brought together international researchers to discuss our understanding of evolutionary dynamics in invasive trees. The main outcome of this workshop is this Special Issue of AoB PLANTS. The collection of papers in this issue has helped to identify and assess the evolutionary mechanisms that are likely to influence tree invasions. It also facilitated expansion of the unified framework for biological invasions to incorporate key evolutionary processes. The papers cover a wide range of evolutionary mechanisms in tree genomes (adaptation), epigenomes (phenotypic plasticity) and their second genomes (mutualists), and show how such mechanisms can impact tree invasion processes and management. The special issue provides a comprehensive overview of the factors that promote and mitigate the invasive success of tree species in many parts of the world. It also shows that incorporating evolutionary concepts is crucial for understanding the complex drivers of tree invasions and has much potential to improve management. The contributions of the special issue also highlight many priorities for further work in the face of ever-increasing tree invasions; the complexity of this research needs calls for expanded interdisciplinary research collaborations.
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Affiliation(s)
- Heidi Hirsch
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland 7602, South Africa
| | - David M. Richardson
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland 7602, South Africa
| | - Johannes J. Le Roux
- Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland 7602, South Africa
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Wood LE, De Grave S, Daniels SR. Phylogeographic patterning among two codistributed shrimp species (Crustacea: Decapoda: Palaemonidae) reveals high levels of connectivity across biogeographic regions along the South African coast. PLoS One 2017; 12:e0173356. [PMID: 28282399 PMCID: PMC5345795 DOI: 10.1371/journal.pone.0173356] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 02/19/2017] [Indexed: 12/04/2022] Open
Abstract
We compare the genetic structuring and demographic history of two sympatric caridean shrimp species with distinct life history traits, one amphidromous species Palaemon capensis and one marine/estuarine species Palaemon peringueyi, in the historical biogeographical context of South Africa. A total of 103 specimens of P. capensis collected from 12 localities and 217 specimens of P. peringueyi collected from 24 localities were sequenced for the mitochondrial cytochrome oxidase one (CO1) locus. Results from analyses of molecular variance (AMOVA), pairwise ΦST comparisons and haplotype networks demonstrate weak to moderate genetic differentiation in P. capensis and P. peringueyi respectively. P. peringueyi exhibits partial isolation between populations associated with distinct biogeographic regions, likely driven by the region’s oceanography. However, there is minimal evidence for the occurrence of discrete regional evolutionary lineages. This demonstrated lack of genetic differentiation is consistent with a marine, highly dispersive planktonic phase in both the amphidromous P. capensis and the marine/estuarine P. peringueyi. Bayesian skyline plots, mismatch expansions and time since expansion indicate that both species maintained stable populations during the Last Glacial Maximum (LGM), unlike other southern African aquatic species.
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Affiliation(s)
- Louisa E. Wood
- Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, South Africa
- * E-mail:
| | - Sammy De Grave
- Oxford University Museum of Natural History, Parks Road, Oxford, United Kingdom
| | - Savel R. Daniels
- Department of Botany and Zoology, University of Stellenbosch, Private Bag X1, Matieland, South Africa
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Hirsch H, Gallien L, Impson FAC, Kleinjan C, Richardson DM, Le Roux JJ. Unresolved native range taxonomy complicates inferences in invasion ecology: Acacia dealbata Link as an example. Biol Invasions 2017. [DOI: 10.1007/s10530-017-1381-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hirsch H, Hensen I, Wesche K, Renison D, Wypior C, Hartmann M, von Wehrden H. Non-native populations of an invasive tree outperform their native conspecifics. AOB PLANTS 2017; 8:plw071. [PMID: 27742647 PMCID: PMC5206335 DOI: 10.1093/aobpla/plw071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 09/20/2016] [Indexed: 05/31/2023]
Abstract
Introduced plants often face new environmental conditions in their non-native ranges. To become invasive, they need to overcome several biotic and abiotic filters that may trigger adaptive changes in life-history traits, like post-germination processes. Such early life cycle traits may play a crucial role in the colonization and establishment success of invasive plants. As a previous study revealed that seeds of non-native populations of the woody Siberian elm, Ulmus pumila, germinated faster than those of native populations, we expected growth performance of seedlings to mirror this finding. Here, we conducted a common garden greenhouse experiment using different temperature and watering treatments to compare the biomass production of U. pumila seedlings derived from 7 native and 13 populations from two non-native ranges. Our results showed that under all treatments, non-native populations were characterized by higher biomass production and enhanced resource allocation to aboveground biomass compared to the native populations. The observed enhanced growth performance of non-native populations might be one of the contributing factors for the invasion success of U. pumila due to competitive advantages during the colonization of new sites.
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Affiliation(s)
- Heidi Hirsch
- Department of Botany and Zoology, Centre for Invasion Biology, Stellenbosch University, Matieland, South Africa
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Isabell Hensen
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Karsten Wesche
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Senckenberg Museum of Natural History Goerlitz, Am Museum 1, 02826 Goerlitz, Germany
| | - Daniel Renison
- Centro de Ecología y Recursos Naturales Renovables - Dr. Ricardo Luti (CERNAR - FCEFyN - UNC) and Instituto de Investigaciones Biológicas y Tecnológicas (IIByT - CONICET - UNC), Av. Vélez Sarsfield 1611, Córdoba X5016GCA, Argentina
| | - Catherina Wypior
- Institute of Biology/Geobotany and Botanical Garden, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Matthias Hartmann
- Herbarium PRC & Department of Botany, Charles University in Prague, Benátská 2, 12801 Praha, Czech Republic
| | - Henrik von Wehrden
- Institute of Ecology/Faculty of Sustainability, Centre of Methods, Leuphana University, Scharnhorststraße 1, 21335 Lueneburg, Germany
- Research Institute of Wildlife Ecology, Savoyen Strasse 1, 1160 Vienna, Austria
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De Kort H, Mergeay J, Jacquemyn H, Honnay O. Transatlantic invasion routes and adaptive potential in North American populations of the invasive glossy buckthorn, Frangula alnus. ANNALS OF BOTANY 2016; 118:1089-1099. [PMID: 27539599 PMCID: PMC5091722 DOI: 10.1093/aob/mcw157] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 05/02/2016] [Accepted: 06/17/2016] [Indexed: 05/31/2023]
Abstract
BACKGROUND AND AIMS Many invasive species severely threaten native biodiversity and ecosystem functioning. One of the most prominent questions in invasion genetics is how invasive populations can overcome genetic founder effects to establish stable populations after colonization of new habitats. High native genetic diversity and multiple introductions are expected to increase genetic diversity and adaptive potential in the invasive range. Our aim was to identify the European source populations of Frangula alnus (glossy buckthorn), an ornamental and highly invasive woody species that was deliberately introduced into North America at the end of the 18th century. A second aim of this study was to assess the adaptive potential as an explanation for the invasion success of this species. METHODS Using a set of annotated single-nucleotide polymorphisms (SNPs) that were assigned a putative function based on sequence comparison with model species, a total of 38 native European and 21 invasive North American populations were subjected to distance-based structure and assignment analyses combined with population genomic tools. Genetic diversity at SNPs with ecologically relevant functions was considered as a proxy for adaptive potential. KEY RESULTS Patterns of invasion coincided with early modern transatlantic trading routes. Multiple introductions through transatlantic trade from a limited number of European port regions to American urban areas led to the establishment of bridgehead populations with high allelic richness and expected heterozygosity, allowing continuous secondary migration to natural areas. CONCLUSIONS Targeted eradication of the urban populations, where the highest genetic diversity and adaptive potential were observed, offers a promising strategy to arrest further invasion of native American prairies and forests.
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Affiliation(s)
- Hanne De Kort
- Plant Conservation and Population Biology, Biology Department, University of Leuven, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium Station d'Ecologie Théorique et Expérimentale du CNRS, Centre National de la Recherche Scientifique, 2 Route du CNRS, FR-09200 Moulis, France
| | - Joachim Mergeay
- Research Institute for Nature and Forest, Gaverstraat 4, B-9500 Geraardsbergen, Belgium
| | - Hans Jacquemyn
- Plant Conservation and Population Biology, Biology Department, University of Leuven, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium
| | - Olivier Honnay
- Plant Conservation and Population Biology, Biology Department, University of Leuven, Kasteelpark Arenberg 31, B-3001 Heverlee, Belgium
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Besnard G, Cuneo P. An ecological and evolutionary perspective on the parallel invasion of two cross-compatible trees. AOB PLANTS 2016; 8:plw056. [PMID: 27519914 PMCID: PMC5018386 DOI: 10.1093/aobpla/plw056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 08/01/2016] [Indexed: 05/29/2023]
Abstract
Invasive trees are generally seen as ecosystem-transforming plants that can have significant impacts on native vegetation, and often require management and control. Understanding their history and biology is essential to guide actions of land managers. Here, we present a summary of recent research into the ecology, phylogeography and management of invasive olives, which are now established outside of their native range as high ecological impact invasive trees. The parallel invasion of European and African olive in different climatic zones of Australia provides an interesting case study of invasion, characterized by early genetic admixture between domesticated and wild taxa. Today, the impact of the invasive olives on native vegetation and ecosystem function is of conservation concern, with European olive a declared weed in areas of South Australia, and African olive a declared weed in New South Wales and Pacific islands. Population genetics was used to trace the origins and invasion of both subspecies in Australia, indicating that both olive subspecies have hybridized early after introduction. Research also indicates that African olive populations can establish from a low number of founder individuals even after successive bottlenecks. Modelling based on distributional data from the native and invasive range identified a shift of the realized ecological niche in the Australian invasive range for both olive subspecies, which was particularly marked for African olive. As highly successful and long-lived invaders, olives offer further opportunities to understand the genetic basis of invasion, and we propose that future research examines the history of introduction and admixture, the genetic basis of adaptability and the role of biotic interactions during invasion. Advances on these questions will ultimately improve predictions on the future olive expansion and provide a solid basis for better management of invasive populations.
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Affiliation(s)
- Guillaume Besnard
- CNRS, UPS, ENFA, Laboratoire Evolution & Diversité Biologique, UMR 5174, 31062 Toulouse 4, France
| | - Peter Cuneo
- The Australian PlantBank, Royal Botanic Gardens and Domain Trust, The Australian Botanic Garden, Mount Annan, NSW 2567, Australia
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20
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Shaik RS, Zhu X, Clements DR, Weston LA. Understanding invasion history and predicting invasive niches using genetic sequencing technology in Australia: case studies from Cucurbitaceae and Boraginaceae. CONSERVATION PHYSIOLOGY 2016; 4:cow030. [PMID: 27766152 PMCID: PMC5069847 DOI: 10.1093/conphys/cow030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 06/20/2016] [Accepted: 06/27/2016] [Indexed: 05/07/2023]
Abstract
Part of the challenge in dealing with invasive plant species is that they seldom represent a uniform, static entity. Often, an accurate understanding of the history of plant introduction and knowledge of the real levels of genetic diversity present in species and populations of importance is lacking. Currently, the role of genetic diversity in promoting the successful establishment of invasive plants is not well defined. Genetic profiling of invasive plants should enhance our understanding of the dynamics of colonization in the invaded range. Recent advances in DNA sequencing technology have greatly facilitated the rapid and complete assessment of plant population genetics. Here, we apply our current understanding of the genetics and ecophysiology of plant invasions to recent work on Australian plant invaders from the Cucurbitaceae and Boraginaceae. The Cucurbitaceae study showed that both prickly paddy melon (Cucumis myriocarpus) and camel melon (Citrullus lanatus) were represented by only a single genotype in Australia, implying that each was probably introduced as a single introduction event. In contrast, a third invasive melon, Citrullus colocynthis, possessed a moderate level of genetic diversity in Australia and was potentially introduced to the continent at least twice. The Boraginaceae study demonstrated the value of comparing two similar congeneric species; one, Echium plantagineum, is highly invasive and genetically diverse, whereas the other, Echium vulgare, exhibits less genetic diversity and occupies a more limited ecological niche. Sequence analysis provided precise identification of invasive plant species, as well as information on genetic diversity and phylogeographic history. Improved sequencing technologies will continue to allow greater resolution of genetic relationships among invasive plant populations, thereby potentially improving our ability to predict the impact of these relationships upon future spread and better manage invaders possessing potentially diverse biotypes and exhibiting diverse breeding systems, life histories and invasion histories.
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Affiliation(s)
- Razia S. Shaik
- Graham Centre for Agricultural Innovation (Charles Sturt University and NSW Department of Primary Industries), Locked Bag 588, Wagga Wagga, NSW 2678, Australia
| | - Xiaocheng Zhu
- Graham Centre for Agricultural Innovation (Charles Sturt University and NSW Department of Primary Industries), Locked Bag 588, Wagga Wagga, NSW 2678, Australia
| | - David R. Clements
- Department of Biology, Trinity Western University, Langley, BC, CanadaV2Y 1Y1
| | - Leslie A. Weston
- Graham Centre for Agricultural Innovation (Charles Sturt University and NSW Department of Primary Industries), Locked Bag 588, Wagga Wagga, NSW 2678, Australia
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Moody ML, Palomino N, Weyl PSR, Coetzee JA, Newman RM, Harms NE, Liu X, Thum RA. Unraveling the biogeographic origins of the Eurasian watermilfoil (Myriophyllum spicatum) invasion in North America. AMERICAN JOURNAL OF BOTANY 2016; 103:709-718. [PMID: 27033316 DOI: 10.3732/ajb.1500476] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 02/17/2016] [Indexed: 06/05/2023]
Abstract
PREMISE OF THE STUDY Using phylogeographic analyses to determine the geographic origins of biological invaders is important for identifying environmental adaptations and genetic composition in their native range as well as biocontrol agents among indigenous herbivores. Eurasian watermilfoil (Myriophyllum spicatum) and its hybrid with northern watermilfoil (M. sibiricum) are found throughout the contiguous United States and southern Canada, forming one of the most economically costly aquatic plant invasions in North America, yet the geographic origin of the invasion remains unknown. The objectives of our study included determining the geographic origin of Eurasian watermilfoil in North America as well as the maternal lineage of the hybrids. METHODS DNA sequence data from a cpDNA intron and the nrDNA ITS region were compiled for accessions from 110 populations of Eurasian watermilfoil and hybrids from North America and the native range (including Europe, Asia, and Africa). Datasets were analyzed using statistical parsimony and Bayesian phylogenetics to assess the geographic origin of the invasion. KEY RESULTS The two Eurasian watermilfoil cpDNA haplotypes in North America are also found from China and Korea, but not elsewhere in the native range. These haplotypes did not overlap and were limited in native geographic range. The ovule parent for hybrids can come from either parental lineage, and multiple haplotypes from both parental species were found. CONCLUSIONS The geographic origin of this prolific aquatic plant invasion of North America is in Asia. This provides critical information to better understand the invasion pathway and inform management into the future.
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Affiliation(s)
- Michael L Moody
- Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas, USA
| | - Nayell Palomino
- Department of Biological Sciences, University of Texas at El Paso, El Paso, Texas, USA
| | - Philip S R Weyl
- Department of Zoology and Entomology, Rhodes University, Grahamstown, 6140, South Africa
| | - Julie A Coetzee
- Department of Zoology and Entomology, Rhodes University, Grahamstown, 6140, South Africa
| | - Raymond M Newman
- Department of Fisheries, Wildlife, and Conservation Biology, University of Minnesota, St. Paul, Minnesota, USA
| | - Nathan E Harms
- U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Rd., Vicksburg, Mississippi, USA
| | - Xing Liu
- Laboratory of Plant Systematics and Evolutionary Biology, College of Life Sciences, Wuhan University, Wuhan, Hubei, China
| | - Ryan A Thum
- Department of Plant Sciences & Plant Pathology, Montana State University, Bozeman, Montana, USA
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Kasprowicz AE, Statham MJ, Sacks BN. Fate of the other redcoat: remnants of colonial British foxes in the eastern United States. J Mammal 2015. [DOI: 10.1093/jmammal/gyv179] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Red foxes were absent or rare in the southeastern United States until the late 1800s. Their origins potentially include natural population increase/expansion, translocations from Europe, and, eventually, 20th century fur farming. Previous studies have found no European haplotypes in North America, but few samples were sourced from the Atlantic coastal plain, closer to the source of putative introductions. Through analysis of mitochondrial DNA in 584 red foxes from this region, we identified indigenous haplotypes in ≥ 35% of foxes, 1 of 2 European haplotypes in 17% of foxes and fur farm haplotypes in ≥ 13% of foxes; another 35% of foxes had haplotypes potentially indigenous or native. In contrast, only 3 of 135 (2%) male foxes carried a single European Y chromosome haplotype. Most European and fur farm haplotypes were found near the densely human-populated coastal plain and Hudson River lowlands; most red foxes of the Appalachians and Piedmont had native eastern haplotypes. Our findings suggest that the more remote, upland populations primarily reflect indigenous red fox matrilines, whereas urban-associated populations in and around the mid-Atlantic coastal plain and Hudson lowlands reflect an admixture of native and nonnative maternal sources. Autosomal markers are needed to further elucidate the extent of European and fur farm introgression in the Appalachians and further west.
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Kumar S, LeBrun EG, Stohlgren TJ, Stabach JA, McDonald DL, Oi DH, LaPolla JS. Evidence of niche shift and global invasion potential of the Tawny Crazy ant, Nylanderia fulva. Ecol Evol 2015; 5:4628-41. [PMID: 26668728 PMCID: PMC4670064 DOI: 10.1002/ece3.1737] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 07/24/2015] [Accepted: 08/22/2015] [Indexed: 11/05/2022] Open
Abstract
Analysis of an invasive species' niche shift between native and introduced ranges, along with potential distribution maps, can provide valuable information about its invasive potential. The tawny crazy ant, Nylanderia fulva, is a rapidly emerging and economically important invasive species in the southern United States. It is originally from east‐central South America and has also invaded Colombia and the Caribbean Islands. Our objectives were to generate a global potential distribution map for N. fulva, identify important climatic drivers associated with its current distribution, and test whether N. fulva's realized climatic niche has shifted across its invasive range. We used MaxEnt niche model to map the potential distribution of N. fulva using its native and invaded range occurrences and climatic variables. We used principal component analysis methods for investigating potential shifts in the realized climatic niche of N. fulva during invasion. We found strong evidence for a shift in the realized climatic niche of N. fulva across its invasive range. Our models predicted potentially suitable habitat for N. fulva in the United States and other parts of the world. Our analyses suggest that the majority of observed occurrences of N. fulva in the United States represent stabilizing populations. Mean diurnal range in temperature, degree days at ≥10°C, and precipitation of driest quarter were the most important variables associated with N. fulva distribution. The climatic niche expansion demonstrated in our study may suggest significant plasticity in the ability of N. fulva to survive in areas with diverse temperature ranges shown by its tolerance for environmental conditions in the southern United States, Caribbean Islands, and Colombia. The risk maps produced in this study can be useful in preventing N. fulva's future spread, and in managing and monitoring currently infested areas.
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Affiliation(s)
- Sunil Kumar
- Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523-1499 ; Department of Ecosystem Science and Sustainability Colorado State University Fort Collins Colorado 80523-1499
| | - Edward G LeBrun
- Brackenridge Field Laboratory Section of Integrative Biology University of Texas at Austin 2907 Lake Austin Blvd Austin Texas 78703
| | - Thomas J Stohlgren
- Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523-1499 ; Department of Ecosystem Science and Sustainability Colorado State University Fort Collins Colorado 80523-1499
| | - Jared A Stabach
- Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado 80523-1499
| | - Danny L McDonald
- Texas Research Institute for Environmental Studies Sam Houston State University Huntsville Texas 77341-2506
| | - David H Oi
- USDA-ARS Center for Medical, Agricultural & Veterinary Entomology Gainesville Florida 32608-1067
| | - John S LaPolla
- Department of Biological Sciences Towson University Towson Maryland 21252-0001
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Hagenblad J, Hülskötter J, Acharya KP, Brunet J, Chabrerie O, Cousins SAO, Dar PA, Diekmann M, De Frenne P, Hermy M, Jamoneau A, Kolb A, Lemke I, Plue J, Reshi ZA, Graae BJ. Low genetic diversity despite multiple introductions of the invasive plant species Impatiens glandulifera in Europe. BMC Genet 2015; 16:103. [PMID: 26289555 PMCID: PMC4546075 DOI: 10.1186/s12863-015-0242-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 06/29/2015] [Indexed: 11/12/2022] Open
Abstract
Background Invasive species can be a major threat to native biodiversity and the number of invasive plant species is increasing across the globe. Population genetic studies of invasive species can provide key insights into their invasion history and ensuing evolution, but also for their control. Here we genetically characterise populations of Impatiens glandulifera, an invasive plant in Europe that can have a major impact on native plant communities. We compared populations from the species’ native range in Kashmir, India, to those in its invaded range, along a latitudinal gradient in Europe. For comparison, the results from 39 other studies of genetic diversity in invasive species were collated. Results Our results suggest that I. glandulifera was established in the wild in Europe at least twice, from an area outside of our Kashmir study area. Our results further revealed that the genetic diversity in invasive populations of I. glandulifera is unusually low compared to native populations, in particular when compared to other invasive species. Genetic drift rather than mutation seems to have played a role in differentiating populations in Europe. We find evidence of limitations to local gene flow after introduction to Europe, but somewhat less restrictions in the native range. I. glandulifera populations with significant inbreeding were only found in the species’ native range and invasive species in general showed no increase in inbreeding upon leaving their native ranges. In Europe we detect cases of migration between distantly located populations. Human activities therefore seem to, at least partially, have facilitated not only introductions, but also further spread of I. glandulifera across Europe. Conclusions Although multiple introductions will facilitate the retention of genetic diversity in invasive ranges, widespread invasive species can remain genetically relatively invariant also after multiple introductions. Phenotypic plasticity may therefore be an important component of the successful spread of Impatiens glandulifera across Europe. Electronic supplementary material The online version of this article (doi:10.1186/s12863-015-0242-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jenny Hagenblad
- Norwegian University of Science and Technology, Department of Biology, NO-7491, Trondheim, Norway. .,IFM - Biology, Linköping University, SE-581 83, Linköping, Sweden.
| | - Jennifer Hülskötter
- Norwegian University of Science and Technology, Department of Biology, NO-7491, Trondheim, Norway. .,University of Applied Sciences Bremen, DE-28199, Bremen, Germany.
| | - Kamal Prasad Acharya
- Norwegian University of Science and Technology, Department of Biology, NO-7491, Trondheim, Norway.
| | - Jörg Brunet
- Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, SE-230 53, Alnarp, Sweden.
| | - Olivier Chabrerie
- Plant Biodiversity Lab, FRE 3498 CNRS, Université de Picardie Jules Verne, FR-80037, Amiens, Cedex, France.
| | - Sara A O Cousins
- Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91, Stockholm, Sweden.
| | - Pervaiz A Dar
- Department of Botany, University of Kashmir, Srinagar - 190006, Jammu & Kashmir, India.
| | - Martin Diekmann
- Vegetation Ecology and Conservation Biology, Institute of Ecology, University of Bremen, DE-28359, Bremen, Germany.
| | - Pieter De Frenne
- Forest & Nature Lab, Ghent University, BE-9090, Melle Gontrode, Belgium.
| | - Martin Hermy
- Division Forest, Nature and Landscape, University of Leuven, BE-3001, Leuven, Belgium.
| | - Aurélien Jamoneau
- Plant Biodiversity Lab, FRE 3498 CNRS, Université de Picardie Jules Verne, FR-80037, Amiens, Cedex, France.
| | - Annette Kolb
- Vegetation Ecology and Conservation Biology, Institute of Ecology, University of Bremen, DE-28359, Bremen, Germany.
| | - Isgard Lemke
- Vegetation Ecology and Conservation Biology, Institute of Ecology, University of Bremen, DE-28359, Bremen, Germany.
| | - Jan Plue
- Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91, Stockholm, Sweden.
| | - Zafar A Reshi
- Department of Botany, University of Kashmir, Srinagar - 190006, Jammu & Kashmir, India.
| | - Bente Jessen Graae
- Norwegian University of Science and Technology, Department of Biology, NO-7491, Trondheim, Norway.
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Invasion of Brassica nigra in North America: distributions and origins of chloroplast DNA haplotypes suggest multiple introductions. Biol Invasions 2015. [DOI: 10.1007/s10530-015-0888-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Population genetics of invasive Citrullus lanatus, Citrullus colocynthis and Cucumis myriocarpus (Cucurbitaceae) in Australia: inferences based on chloroplast and nuclear gene sequencing. Biol Invasions 2015. [DOI: 10.1007/s10530-015-0891-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Chown SL, Hodgins KA, Griffin PC, Oakeshott JG, Byrne M, Hoffmann AA. Biological invasions, climate change and genomics. Evol Appl 2015; 8:23-46. [PMID: 25667601 PMCID: PMC4310580 DOI: 10.1111/eva.12234] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 10/24/2014] [Indexed: 12/13/2022] Open
Abstract
The rate of biological invasions is expected to increase as the effects of climate change on biological communities become widespread. Climate change enhances habitat disturbance which facilitates the establishment of invasive species, which in turn provides opportunities for hybridization and introgression. These effects influence local biodiversity that can be tracked through genetic and genomic approaches. Metabarcoding and metagenomic approaches provide a way of monitoring some types of communities under climate change for the appearance of invasives. Introgression and hybridization can be followed by the analysis of entire genomes so that rapidly changing areas of the genome are identified and instances of genetic pollution monitored. Genomic markers enable accurate tracking of invasive species' geographic origin well beyond what was previously possible. New genomic tools are promoting fresh insights into classic questions about invading organisms under climate change, such as the role of genetic variation, local adaptation and climate pre-adaptation in successful invasions. These tools are providing managers with often more effective means to identify potential threats, improve surveillance and assess impacts on communities. We provide a framework for the application of genomic techniques within a management context and also indicate some important limitations in what can be achieved.
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Affiliation(s)
- Steven L Chown
- School of Biological Sciences, Monash UniversityClayton, Vic., Australia
| | - Kathryn A Hodgins
- School of Biological Sciences, Monash UniversityClayton, Vic., Australia
| | - Philippa C Griffin
- Department of Genetics, Bio21 Institute, The University of MelbourneParkville, Vic., Australia
| | - John G Oakeshott
- CSIRO Land and Water Flagship, Black Mountain LaboratoriesCanberra, ACT, Australia
| | - Margaret Byrne
- Science and Conservation Division, Department of Parks and Wildlife, Bentley Delivery CentreBentley, WA, Australia
| | - Ary A Hoffmann
- Departments of Zoology and Genetics, Bio21 Institute, The University of MelbourneParkville, Vic., Australia
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Le Roux JJ, Strasberg D, Rouget M, Morden CW, Koordom M, Richardson DM. Relatedness defies biogeography: the tale of two island endemics (Acacia heterophylla and A. koa). THE NEW PHYTOLOGIST 2014; 204:230-242. [PMID: 24942529 DOI: 10.1111/nph.12900] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 05/21/2014] [Indexed: 06/03/2023]
Abstract
Despite the normally strong link between geographic proximity and relatedness of recently diverged taxa, truly puzzling biogeographic anomalies to this expectation exist in nature. Using a dated phylogeny, population genetic structure and estimates of ecological niche overlap, we tested the hypothesis that two geographically very disjunct, but morphologically very similar, island endemics (Acacia heterophylla from Réunion Island and A. koa from the Hawaiian archipelago) are the result of dispersal between these two island groups, rather than independent colonization events from Australia followed by convergent evolution. Our genetic results indicated that A. heterophylla renders A. koa paraphyletic and that the former colonized the Mascarene archipelago directly from the Hawaiian Islands ≤ 1.4 million yr ago. This colonization sequence was corroborated by similar ecological niches between the two island taxa, but not between A. melanoxylon from Australia (a sister, and presumed ancestral, taxon to A. koa and A. heterophylla) and Hawaiian A. koa. It is widely accepted that the long-distance dispersal of plants occurs more frequently than previously thought. Here, however, we document one of the most exceptional examples of such dispersal. Despite c. 18 000 km separating A. heterophylla and A. koa, these two island endemics from two different oceans probably represent a single taxon as a result of recent extreme long-distance dispersal.
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Affiliation(s)
- Johannes J Le Roux
- Department of Botany & Zoology, Centre for Invasion Biology, Stellenbosch University, Matieland, 7602, South Africa
| | - Dominique Strasberg
- UMR PVBMT, Peuplements Végétaux et Bioagresseurs en Milieu Tropical, Université de La Réunion, 15 avenue René Cassin, CS 93002, 97 744, Saint-Denis Messag. Cedex 9, France
| | - Mathieu Rouget
- Centre for Invasion Biology, Land Use Planning and Management, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Pietermaritzburg, 3209, South Africa
| | - Clifford W Morden
- Department of Botany, University of Hawai'i, 3190 Maile Way, Honolulu, HI, 96822, USA
| | - Megan Koordom
- Department of Botany & Zoology, Centre for Invasion Biology, Stellenbosch University, Matieland, 7602, South Africa
| | - David M Richardson
- Department of Botany & Zoology, Centre for Invasion Biology, Stellenbosch University, Matieland, 7602, South Africa
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Donaldson JE, Hui C, Richardson DM, Robertson MP, Webber BL, Wilson JRU. Invasion trajectory of alien trees: the role of introduction pathway and planting history. GLOBAL CHANGE BIOLOGY 2014; 20:1527-37. [PMID: 24343918 DOI: 10.1111/gcb.12486] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Accepted: 11/19/2013] [Indexed: 05/24/2023]
Abstract
Global change is driving a massive rearrangement of the world's biota. Trajectories of distributional shifts are shaped by species traits, the recipient environment and driving forces with many of the driving forces directly due to human activities. The relative importance of each in determining the distributions of introduced species is poorly understood. We consider 11 Australian Acacia species introduced to South Africa for different reasons (commercial forestry, dune stabilization and ornamentation) to determine how features of the introduction pathway have shaped their invasion history. Projections from species distribution models (SDMs) were developed to assess how the reason for introduction influences the similarity between climatic envelopes in native and alien ranges. A lattice model for an idealized invasion was developed to assess the relative contribution of intrinsic traits and introduction dynamics on the abundance and extent over the course of simulated invasions. SDMs show that alien populations of ornamental species in South Africa occupy substantially different climate space from their native ranges, whereas species introduced for forestry occupy a similar climate space in native and introduced ranges. This may partly explain the slow spread rates observed for some alien ornamental plants. Such mismatches are likely to become less pronounced with the current drive towards 'eco gardens' resulting in more introductions of ornamental species with a close climate match between native and newly introduced regions. The results from the lattice model showed that the conditions associated with the introduction pathway (especially introduction pressure) dominate early invasion dynamics. The placement of introduction foci in urban areas limited the extent and abundance of invasive populations. Features of introduction events appear to initially mask the influence of intrinsic species traits on invasions and help to explain the relative success of species introduced for different purposes. Introduction dynamics therefore can have long-lasting influences on the outcomes of species redistributions, and must be explicitly considered in management plans.
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Affiliation(s)
- Jason E Donaldson
- Department of Botany and Zoology, Centre for Invasion Biology, Stellenbosch University, Matieland, 7602, South Africa
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Donaldson JE, Richardson DM, Wilson JRU. Scale-area curves: a tool for understanding the ecology and distribution of invasive tree species. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0602-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Le Roux JJ, Richardson DM, Wilson JRU, Ndlovu J. Human usage in the native range may determine future genetic structure of an invasion: insights from Acacia pycnantha. BMC Ecol 2013; 13:37. [PMID: 24083397 PMCID: PMC3840604 DOI: 10.1186/1472-6785-13-37] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 09/19/2013] [Indexed: 11/10/2022] Open
Abstract
Background The influence of introduction history and post-introduction dynamics on genetic diversity and structure has been a major research focus in invasion biology. However, genetic diversity and structure in the invasive range can also be affected by human-mediated processes in the native range prior to species introductions, an aspect often neglected in invasion biology. Here we aim to trace the native provenance of the invasive tree Acacia pycnantha by comparing the genetic diversity and structure between populations in the native Australian range and the invasive range in South Africa. This approach also allowed us to explore how human actions altered genetic structure before and after the introduction of A. pycnantha into South Africa. We hypothesized that extensive movement and replanting in A. pycnantha’s Australian range prior to its introduction to South Africa might result in highly admixed genotypes in the introduced range, comparable genetic diversity in both ranges, and therefore preclude an accurate determination of native provenance(s) of invasive populations. Results In the native range Bayesian assignment tests identified three genetic clusters with substantial admixture and could not clearly differentiate previously identified genetic entities, corroborating admixture as a result of replantings within Australia. Assignment tests that included invasive populations from South Africa indicated similar levels of admixture compared to Australian populations and a lack of genetic structure. Invasive populations of A. pycnantha in South Africa are as genetically diverse as native populations, and could not be assigned to particular native range regions. Conclusions Our results indicate that the genetic structure of A. pycnantha in Australia has been greatly altered through various planting initiatives. Specifically, there is little geographic structure and high levels of admixture. While numerous introduction history scenarios may explain the levels of admixture observed in South Africa, planting records of A. pycnantha in Australia suggest that populations were probably already admixed before propagules were introduced to South Africa. These findings have important implications for the management of invasive A. pycnantha populations in South Africa, especially for classical biological control, and more broadly, for studies that aim to understand the evolutionary dynamics of the invasion process.
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Affiliation(s)
- Johannes J Le Roux
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa.
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Beauclerc KB, Bowman J, Schulte-Hostedde AI. Assessing the cryptic invasion of a domestic conspecific: American mink in their native range. Ecol Evol 2013; 3:2296-309. [PMID: 23919171 PMCID: PMC3728966 DOI: 10.1002/ece3.630] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 05/09/2013] [Accepted: 05/10/2013] [Indexed: 12/03/2022] Open
Abstract
Control of invasions is facilitated by their early detection, but this may be difficult when invasions are cryptic due to similarity between invaders and native species. Domesticated conspecifics offer an interesting example of cryptic invasions because they have the ability to hybridize with their native counterparts, and can thus facilitate the introgression of maladaptive genes. We assessed the cryptic invasion of escaped domestic American mink (Neovison vison) within their native range. Feral mink are a known alien invader in many parts of the world, but invasion of their native range is not well understood. We genetically profiled 233 captive domestic mink from different farms in Ontario, Canada and 299 free-ranging mink from Ontario, and used assignments tests to ascertain genetic ancestries of free-ranging animals. We found that 18% of free-ranging mink were either escaped domestic animals or hybrids, and a tree regression showed that these domestic genotypes were most likely to occur south of a latitude of 43.13°N, within the distribution of mink farms in Ontario. Thus, domestic mink appear not to have established populations in Ontario in locations without fur farms. We suspect that maladaptation of domestic mink and outbreeding depression of hybrid and introgressed mink have limited their spread. Mink farm density and proximity to mink farms were not important predictors of domestic genotypes but rather, certain mink farms appeared to be important sources of escaped domestic animals. Our results show that not all mink farms are equal with respect to biosecurity, and thus that the spread of domestic genotypes can be mitigated by improved biosecurity.
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Affiliation(s)
- Kaela B Beauclerc
- Wildlife Research and Development Section, Ontario Ministry of Natural Resources Trent University DNA Building, 2140 East Bank Drive, Peterborough, Ontario, K9J 7B8, Canada
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Ndlovu J, Richardson DM, Wilson JRU, O'Leary M, Le Roux JJ. Elucidating the native sources of an invasive tree species, Acacia pycnantha, reveals unexpected native range diversity and structure. ANNALS OF BOTANY 2013; 111:895-904. [PMID: 23482331 PMCID: PMC3631341 DOI: 10.1093/aob/mct057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 01/25/2013] [Indexed: 05/16/2023]
Abstract
BACKGROUND AND AIMS Understanding the introduction history of invasive plant species is important for their management and identifying effective host-specific biological control agents. However, uncertain taxonomy, intra- and interspecific hybridization, and cryptic speciation may obscure introduction histories, making it difficult to identify native regions to explore for host-specific agents. The overall aim of this study was to identify the native source populations of Acacia pycnantha, a tree native to south-eastern Australia and invasive in South Africa, Western Australia and Portugal. Using a phylogeographical approach also allowed an exploration of the historical processes that have shaped the genetic structure of A. pycnantha in its native range. METHODS Nuclear (nDNA) and plastid DNA sequence data were used in network and tree-building analyses to reconstruct phylogeographical relationships between native and invasive A. pycnantha populations. In addition, mismatch distributions, relative rates and Bayesian analyses were used to infer recent demographic processes and timing of events in Australia that led to population structure and diversification. KEY RESULTS The plastid network indicated that Australian populations of A. pycnantha are geographically structured into two informally recognized lineages, the wetland and dryland forms, whereas the nuclear phylogeny showed little geographical structure between these two forms. Moreover, the dryland form of A. pycnantha showed close genetic similarity to the wetland form based on nDNA sequence data. Hybrid zones may explain these findings, supported here by incongruent phylogenetic placement of some of these taxa between nuclear and plastid genealogies. CONCLUSIONS It is hypothesized that habitat fragmentation due to cycles of aridity inter-dispersed with periods of abundant rainfall during the Pleistocene (approx. 100 kya) probably gave rise to native dryland and wetland forms of A. pycnantha. Although the different lineages were confined to different ecological regions, we also found evidence for intraspecific hybridization in Victoria. The invasive populations in Portugal and South Africa represent wetland forms, whereas some South African populations resemble the Victorian dryland form. The success of the biological control programme for A. pycnantha in South Africa may therefore be attributed to the fact that the gall-forming wasp Trichilogaster signiventris was sourced from South Australian populations, which closely match most of the invasive populations in South Africa.
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Affiliation(s)
- Joice Ndlovu
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
| | - David M. Richardson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
| | - John R. U. Wilson
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
- South African National Biodiversity Institute, Kirstenbosch National Botanical Gardens, Claremont 7735, South Africa
| | - Martin O'Leary
- State Herbarium of South Australia, Hackney Road, Adelaide, SA 5000, Australia
| | - Johannes J. Le Roux
- Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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Plant-soil feedbacks do not explain invasion success of Acacia species in introduced range populations in Australia. Biol Invasions 2013. [DOI: 10.1007/s10530-013-0478-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Namyatova AA, Cassis G. Systematics, phylogeny and host associations of the Australian endemic monaloniine genus Rayieria Odhiambo (Insecta : Heteroptera : Miridae : Bryocorinae). INVERTEBR SYST 2013. [DOI: 10.1071/is13034] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The Australian endemic plant bug genus Rayieria Odhiambo (Heteroptera : Miridae : Bryocorinae : Monaloniina) is revised. Ten species are described as new to science: Rayieria acaciae, sp. nov., R. albaornata, sp. nov., R. decorata, sp. nov., R. frontalis, sp. nov., R. gearyi, sp. nov., R. grandiocula, sp. nov., R. kennedyi, sp. nov., R. minuta, sp. nov.. R. queenslandica, sp. nov., and R. rubranigra, sp. nov. Rayieria braconoides (Walker) and R. tumidiceps (Horváth) are synonymised with R. basifer (Walker), syn. nov. Diagnoses, descriptions, distribution records and host-plant information for all species are given. Digital habitus illustrations of males and females are provided for most species and sexes where available. Male and female genitalia are illustrated for each species. A key to all species is given. Phylogenetic analysis of the ingroup relationships of Rayieria is given, based on 11 ingroups, 16 outgroups and 56 morphological characters. The analysis supports monophyly of Rayieria and establishes a clade comprising all other elongate monaloniine genera, inclusive of Arthriticus Bergroth, Ragwelellus Odhiambo, Helopeltis Signoret and Monalonion Herrich-Schaeffer. Braconid-mimic species of Rayieria are reported. Host-plant associations for this genus and the subtribe Monaloniina are discussed.
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Guiller A, Martin MC, Hiraux C, Madec L. Tracing the invasion of the mediterranean land snail Cornu aspersum aspersum becoming an agricultural and garden pest in areas recently introduced. PLoS One 2012; 7:e49674. [PMID: 23227148 PMCID: PMC3515588 DOI: 10.1371/journal.pone.0049674] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 10/15/2012] [Indexed: 11/19/2022] Open
Abstract
This study is the first on the genetics of invasive populations of one of the most widely spread land mollusc species known in the world, the "Brown Snail" Cornu aspersum aspersum. Deliberately or accidentally imported, the species has become recently a notorious pest outside its native Mediterranean range. We compared the spatial structure and genetic variability of invasive (America, Oceania, South Africa) versus native populations using five microsatellite loci and mitochondrial (Cyt b and 16S rRNA) genes as a first step towards (i) the detection of potential source populations, and (ii) a better understanding of mechanisms governing evolutionary changes involved in the invasion process. Results based on multivariate analysis (Discriminant Analysis of Principal Components), Bayesian statistical inference (Clustering, Approximate Bayesian Computation) and demographic tests allowed a construction of the introduction pathways of the species over recent centuries. While emigrants originated from only one of the two native lineages, the West one, the most likely scenario involved several introduction events and "source switching" comprising (i) an early stage (around 1660) of simultaneous introductions from Europe (France, Spain) towards Oceania (New Zealand) and California, (ii) from the early 18(th) century, a second colonization wave from bridgehead populations successfully established in California, (iii) genetic admixture in invasive areas where highly divergent populations came into contact as in New Zealand. Although these man-made pathways are consistent with historical data, introduction time estimates suggest that the two putative waves of invasion would have occurred long before the first field observations recorded, both in America and in Oceania. A prolonged lag period as the use of an incorrect generation time could explain such 100-150 years discrepancy. Lastly, the contrasting patterns of neutral genetic signal left in invasive populations are discussed in light of possible ways of facing novel environments (standing genetic variation versus new mutation).
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Affiliation(s)
- Annie Guiller
- Centre Nationale de la Recherche Scientifique, UMR 6553, University of Rennes, Rennes, France.
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Riva Rossi CM, Pascual MA, Aedo Marchant E, Basso N, Ciancio JE, Mezga B, Fernández DA, Ernst-Elizalde B. The invasion of Patagonia by Chinook salmon (Oncorhynchus tshawytscha): inferences from mitochondrial DNA patterns. Genetica 2012. [PMID: 23188114 DOI: 10.1007/s10709-012-9692-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The Chinook salmon Oncorhynchus tshawytscha, which was introduced deliberately in Chile four decades ago for sport fishing and aquaculture, represents a rare example of a successful translocation of an anadromous Pacific salmon into the southern Hemisphere, offering a unique opportunity to examine the role of introduction history and genetic variability in invasion success. We used historical information and mitochondrial displacement loop sequences (D-loop) from seven colonized sites in Chile and Argentina and from native and naturalized Chinook salmon populations to determine population sources and to examine levels of genetic diversity associated with the invasion. The analysis revealed that the Chinook salmon invasion in Patagonia originated from multiple population sources from northwestern North America and New Zealand, and admixed in the invaded range generating genetically diverse populations. Genetic analyses further indicated that the colonization of new populations ahead of the invasion front appear to have occurred by noncontiguous dispersal. Dispersal patterns coincided with ocean circulation patterns dominated by the West Wind Drift and the Cape Horn Currents. We conclude that admixture following multiple introductions, as well as long-distance dispersal events may have facilitated the successful invasion and rapid dispersal of Chinook salmon into Patagonia.
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Affiliation(s)
- C M Riva Rossi
- Grupo de Estudios de Salmónidos Anádromos (GESA), Centro Nacional Patagónico (CENPAT-CONICET), Blvd. Brown 2915, 9120, Puerto Madryn, Chubut, Argentina.
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THOMPSON GENEVIEVED, BELLSTEDT DIRKU, BYRNE MARGARET, MILLAR MELISSAA, RICHARDSON DAVIDM, WILSON JOHNR, LE ROUX JOHANNESJ. Cultivation shapes genetic novelty in a globally important invader. Mol Ecol 2012; 21:3187-99. [DOI: 10.1111/j.1365-294x.2012.05601.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Harris CJ, Dormontt EE, Le Roux JJ, Lowe A, Leishman MR. No consistent association between changes in genetic diversity and adaptive responses of Australian acacias in novel ranges. Evol Ecol 2012. [DOI: 10.1007/s10682-012-9570-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hardesty BD, Le Roux JJ, Rocha OJ, Meyer JY, Westcott D, Wieczorek AM. Getting here from there: testing the genetic paradigm underpinning introduction histories and invasion success. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00832.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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Thompson GD, Robertson MP, Webber BL, Richardson DM, Le Roux JJ, Wilson JRU. Predicting the subspecific identity of invasive species using distribution models: Acacia saligna as an example. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00820.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Miller JT, Murphy DJ, Brown GK, Richardson DM, González-Orozco CE. The evolution and phylogenetic placement of invasive Australian Acacia species. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00780.x] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Kull CA, Shackleton CM, Cunningham PJ, Ducatillon C, Dufour-Dror JM, Esler KJ, Friday JB, Gouveia AC, Griffin AR, Marchante E, Midgley SJ, Pauchard A, Rangan H, Richardson DM, Rinaudo T, Tassin J, Urgenson LS, von Maltitz GP, Zenni RD, Zylstra MJ. Adoption, use and perception of Australian acacias around the world. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00783.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Richardson DM, Carruthers J, Hui C, Impson FAC, Miller JT, Robertson MP, Rouget M, Le Roux JJ, Wilson JRU. Human-mediated introductions of Australian acacias - a global experiment in biogeography. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00824.x] [Citation(s) in RCA: 191] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Webber BL, Yates CJ, Le Maitre DC, Scott JK, Kriticos DJ, Ota N, McNeill A, Le Roux JJ, Midgley GF. Modelling horses for novel climate courses: insights from projecting potential distributions of native and alien Australian acacias with correlative and mechanistic models. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00811.x] [Citation(s) in RCA: 162] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Carruthers J, Robin L, Hattingh JP, Kull CA, Rangan H, van Wilgen BW. A native at home and abroad: the history, politics, ethics and aesthetics of acacias. DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00779.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Gibson MR, Richardson DM, Marchante E, Marchante H, Rodger JG, Stone GN, Byrne M, Fuentes-Ramírez A, George N, Harris C, Johnson SD, Roux JJL, Miller JT, Murphy DJ, Pauw A, Prescott MN, Wandrag EM, Wilson JRU. Reproductive biology of Australian acacias: important mediator of invasiveness? DIVERS DISTRIB 2011. [DOI: 10.1111/j.1472-4642.2011.00808.x] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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