1
|
Jense C, Adams M, Raadik TA, Waters JM, Morgan DL, Barmuta LA, Hardie SA, Deagle BE, Burridge CP. Cryptic diversity within two widespread diadromous freshwater fishes (Teleostei: Galaxiidae). Ecol Evol 2024; 14:e11201. [PMID: 38799386 PMCID: PMC11116845 DOI: 10.1002/ece3.11201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 03/03/2024] [Accepted: 03/19/2024] [Indexed: 05/29/2024] Open
Abstract
Identification of taxonomically cryptic species is essential for the effective conservation of biodiversity. Freshwater-limited organisms tend to be genetically isolated by drainage boundaries, and thus may be expected to show substantial cryptic phylogenetic and taxonomic diversity. By comparison, populations of diadromous taxa, that migrate between freshwater and marine environments, are expected to show less genetic differentiation. Here we test for cryptic diversity in Australasian populations (both diadromous and non-diadromous) of two widespread Southern Hemisphere fish species, Galaxias brevipinnis and Galaxias maculatus. Both mtDNA and nuclear markers reveal putative cryptic species within these taxa. The substantial diversity detected within G. brevipinnis may be explained by its strong climbing ability which allows it to form isolated inland populations. In island populations, G. brevipinnis similarly show deeper genetic divergence than those of G. maculatus, which may be explained by the greater abundance of G. maculatus larvae in the sea allowing more ongoing dispersal. Our study highlights that even widespread, 'high-dispersal' species can harbour substantial cryptic diversity and therefore warrant increased taxonomic and conservation attention.
Collapse
Affiliation(s)
- Charlotte Jense
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Mark Adams
- Evolutionary Biology UnitSouth Australian MuseumAdelaideSouth AustraliaAustralia
- School of Biological SciencesThe University of AdelaideAdelaideSouth AustraliaAustralia
| | - Tarmo A. Raadik
- Department of Energy, Environment and Climate ActionArthur Rylah Institute for Environmental ResearchHeidelbergVictoriaAustralia
| | | | - David L. Morgan
- Centre for Sustainable Aquatic Ecosystems, Harry Butler InstituteMurdoch UniversityMurdochWestern AustraliaAustralia
| | - Leon A. Barmuta
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Scott A. Hardie
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| | - Bruce E. Deagle
- Australian National Fish CollectionCSIRO National Research Collections AustraliaHobartTasmaniaAustralia
| | - Christopher P. Burridge
- Discipline of Biological Sciences, School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| |
Collapse
|
2
|
Waters JM, King TM, Craw D. Gorges partition diversity within New Zealand flathead Galaxias populations. JOURNAL OF FISH BIOLOGY 2024; 104:950-956. [PMID: 38018507 DOI: 10.1111/jfb.15635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 11/23/2023] [Accepted: 11/27/2023] [Indexed: 11/30/2023]
Abstract
Understanding the landscape factors governing population connectivity in riverine ecosystems represents an ongoing challenge for freshwater biologists. We used DNA sequence analysis to test the hypothesis that major geomorphological features underpin freshwater-limited fish diversity in a tectonically dynamic region of New Zealand. Phylogeographic analysis of 101 Galaxias depressiceps cytochrome b sequences, incorporating 55 localities from southern New Zealand, revealed 26 haplotypes, with only one shared among rivers. We detect strong hierarchical genetic differentiation both among and within river systems. Genetic structuring is particularly pronounced across the Taieri River system (63 individuals from 35 sites, 18 haplotypes), with 92% of variation partitioned among locations. Distinctive within-river genetic clusters are invariably associated with major subcatchment units, typically isolated by substantial gorges. The anomalous distribution of a single lineage across a major drainage divide is consistent with local, tectonically driven headwater capture. We conclude that major landscape features such as gorges can strongly partition riverine fish diversity and constrain freshwater biodiversity.
Collapse
Affiliation(s)
| | - Tania M King
- Department of Zoology, University of Otago, Dunedin, New Zealand
| | - Dave Craw
- Department of Geology, University of Otago, Dunedin, New Zealand
| |
Collapse
|
3
|
Campbell CSM, Dutoit L, King TM, Craw D, Burridge CP, Wallis GP, Waters JM. Genome‐wide analysis resolves the radiation of New Zealand's freshwater
Galaxias vulgaris
complex and reveals a candidate species obscured by mitochondrial capture. DIVERS DISTRIB 2022. [DOI: 10.1111/ddi.13629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
| | - Ludovic Dutoit
- Department of Zoology University of Otago Dunedin New Zealand
| | - Tania M. King
- Department of Zoology University of Otago Dunedin New Zealand
| | - Dave Craw
- Department of Geology University of Otago Dunedin New Zealand
| | - Christopher P. Burridge
- Discipline of Biological Sciences, School of Natural Sciences University of Tasmania Hobart Australia
| | | | | |
Collapse
|
4
|
Fenker J, Tedeschi LG, Melville J, Moritz C. Predictors of phylogeographic structure among codistributed taxa across the complex Australian monsoonal tropics. Mol Ecol 2021; 30:4276-4291. [PMID: 34216506 DOI: 10.1111/mec.16057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 06/16/2021] [Accepted: 06/28/2021] [Indexed: 11/28/2022]
Abstract
Differences in the geographic scale and depth of phylogeographic structure across codistributed taxa can reveal how microevolutionary processes such as population isolation and persistence drive diversification. In turn, environmental heterogeneity, species' traits, and historical biogeographic barriers may influence the potential for isolation and persistence. Using extensive SNP data and a combination of population genetic summary statistics and landscape genomic analyses, we explored predictors of the scale and depth of phylogeographic structure in codistributed lizard taxa from the topographically and climatically complex monsoonal tropics (AMT) of Australia. We first resolved intraspecific lineages and then tested whether genetic divergence across space within lineages is related to isolation by distance, resistance and/or environment and whether these factors differ across genera or between rock-related versus habitat generalist taxa. We then tested whether microevolutionary processes within lineages explain differences in the geographic scale and depth of intraspecific phylogeographic lineages. The results indicated that landscape predictors of phylogeographic structure differ between taxa. Within lineages, there was prevalent isolation by distance, but the strength of isolation by distance is independent of the taxonomic family, habitat specialization, and climate. Isolation by environment is the strongest predictor of landscape-scale genetic divergence for all taxa, with both temperature and precipitation acting as limiting factors. The strength of isolation by distance does not predict the geographic scale of the phylogeographic structure. However, more localized lineages had higher mean individual heterozygosity and less negative Tajima's D. This result implies that finer-scale phylogeographic structuring within species is associated with larger and more stable populations and, hence, persistence.
Collapse
Affiliation(s)
- Jessica Fenker
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Leonardo G Tedeschi
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Jane Melville
- Department of Sciences, Museums Victoria, Melbourne, VIC, Australia.,School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Craig Moritz
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
| |
Collapse
|
5
|
Hammer MP, Taillebois L, King AJ, Crook DA, Wedd D, Adams M, Unmack PJ, Hoese DF, Bertozzi T. Unravelling the taxonomy and identification of a problematic group of benthic fishes from tropical rivers (Gobiidae: Glossogobius). JOURNAL OF FISH BIOLOGY 2021; 99:87-100. [PMID: 33583039 DOI: 10.1111/jfb.14701] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/01/2021] [Accepted: 02/13/2021] [Indexed: 06/12/2023]
Abstract
Flathead gobies (genus Glossogobius) include c. 40 small- to medium-sized benthic fishes found primarily in freshwater habitats across the Indo-Pacific, having biodiversity value as well as cultural and economic value as food fishes, especially in developing countries. To help resolve considerable confusion regarding the identification of some of the larger-growing Glossogobius species, a systematic framework was established using nuclear genetic markers, mitochondrial DNA barcoding and phenotypic evidence for a geographically widespread collection of individuals from the waterways of tropical northern Australia. Species boundaries and distribution patterns were discordant with those previously reported, most notably for the tank goby Glossogobius giuris, which included a cryptic species. Genetic divergence was matched with accompanying unique visual characters that aid field identification. Additional taxonomic complexity was also evident, by comparison with DNA barcodes from international locations, suggesting that the specific names applicable for two of the candidate species in Australia remain unresolved due to confusion surrounding type specimens. Although flathead gobies are assumed to be widespread and common, this study demonstrates that unrealised taxonomic and ecological complexity is evident, and this will influence assessments of tropical biodiversity and species conservation. This study supports the need for taxonomic studies of freshwater fishes to underpin management in areas subject to significant environmental change.
Collapse
Affiliation(s)
- Michael P Hammer
- Museum and Art Gallery of the Northern Territory, Darwin, Northern Territory, Australia
| | - Laura Taillebois
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Alison J King
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - David A Crook
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Dion Wedd
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Mark Adams
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
- Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
| | - Peter J Unmack
- Centre of Applied Water Science, Institute for Applied Ecology, University of Canberra, Canberra, Australian Capital Territory, Australia
| | - Doug F Hoese
- Australian Museum, Sydney, New South Wales, Australia
| | - Terry Bertozzi
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
- Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
| |
Collapse
|
6
|
Kotsanopoulos KV, Exadactylos A, Gkafas GA, Martsikalis PV, Parlapani FF, Boziaris IS, Arvanitoyannis IS. The use of molecular markers in the verification of fish and seafood authenticity and the detection of adulteration. Compr Rev Food Sci Food Saf 2021; 20:1584-1654. [PMID: 33586855 DOI: 10.1111/1541-4337.12719] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 12/17/2020] [Accepted: 01/10/2021] [Indexed: 12/11/2022]
Abstract
The verification of authenticity and detection of food mislabeling are elements that have been of high importance for centuries. During the last few decades there has been an increasing consumer demand for the verification of food identity and the implementation of stricter controls around these matters. Fish and seafood are among the most easily adulterated foodstuffs mainly due to the significant alterations of the species' morphological characteristics that occur during the different types of processing, which render the visual identification of the animals impossible. Even simple processes, such as filleting remove very important morphological elements and suffice to prevent the visual identification of species in marketed products. Novel techniques have therefore been developed that allow identification of species, the differentiation between species and also the differentiation of individuals that belong to the same species but grow in different populations and regions. Molecular markers have been used during the last few decades to fulfill this purpose and several improvements have been implemented rendering their use applicable to a commercial scale. The reliability, accuracy, reproducibility, and time-and cost-effectiveness of these techniques allowed them to be established as routine methods in the industry and research institutes. This review article aims at presenting the most important molecular markers used for the authentication of fish and seafood. The most important techniques are described, and the results of numerous studies are outlined and discussed, allowing interested parties to easily access and compare information about several techniques and fish/seafood species.
Collapse
Affiliation(s)
- Konstantinos V Kotsanopoulos
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - Athanasios Exadactylos
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - George A Gkafas
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - Petros V Martsikalis
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - Foteini F Parlapani
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - Ioannis S Boziaris
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| | - Ioannis S Arvanitoyannis
- Department of Ichthyology & Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece
| |
Collapse
|
7
|
ddRAD analyses reveal a credible phylogenetic relationship of the four main genera of Bambusa-Dendrocalamus-Gigantochloa complex (Poaceae: Bambusoideae). Mol Phylogenet Evol 2020; 146:106758. [DOI: 10.1016/j.ympev.2020.106758] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 01/24/2020] [Accepted: 01/29/2020] [Indexed: 11/19/2022]
|
8
|
Oliver PM, Prasetya AM, Tedeschi LG, Fenker J, Ellis RJ, Doughty P, Moritz C. Crypsis and convergence: integrative taxonomic revision of the Gehyra australis group (Squamata: Gekkonidae) from northern Australia. PeerJ 2020; 8:e7971. [PMID: 32025362 PMCID: PMC6991128 DOI: 10.7717/peerj.7971] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Accepted: 10/01/2019] [Indexed: 11/20/2022] Open
Abstract
For over two decades, assessments of geographic variation in mtDNA and small numbers of nuclear loci have revealed morphologically similar, but genetically divergent, intraspecific lineages in lizards from around the world. Subsequent morphological analyses often find subtle corresponding diagnostic characters to support the distinctiveness of lineages, but occasionally do not. In recent years it has become increasingly possible to survey geographic variation by sequencing thousands of loci, enabling more rigorous assessment of species boundaries across morphologically similar lineages. Here we take this approach, adding new, geographically extensive SNP data to existing mtDNA and exon capture datasets for the Gehyra australis and G. koira species complexes of gecko from northern Australia. The combination of exon-based phylogenetics with dense spatial sampling of mitochondrial DNA sequencing, SNP-based tests for introgression at lineage boundaries and newly-collected morphological evidence supports the recognition of nine species, six of which are newly described here. Detection of discrete genetic clusters using new SNP data was especially convincing where candidate taxa were continuously sampled across their distributions up to and across geographic boundaries with analyses revealing no admixture. Some species defined herein appear to be truly cryptic, showing little, if any, diagnostic morphological variation. As these SNP-based approaches are progressively applied, and with all due conservatism, we can expect to see a substantial improvement in our ability to delineate and name cryptic species, especially in taxa for which previous approaches have struggled to resolve taxonomic boundaries.
Collapse
Affiliation(s)
- Paul M Oliver
- Environmental Futures Research Institute and School of Environment and Science, Griffith University, South Brisbane, QLD, Australia.,Biodiversity and Geosciences Programme, Queensland Museum, Brisbane, QLD, Australia
| | - Audrey Miranda Prasetya
- Division of Ecology and Evolution, Research School of Biology, and Centre for Biodiversity Analysis, Australian National University, Acton, ACT, Australia
| | - Leonardo G Tedeschi
- Division of Ecology and Evolution, Research School of Biology, and Centre for Biodiversity Analysis, Australian National University, Acton, ACT, Australia
| | - Jessica Fenker
- Division of Ecology and Evolution, Research School of Biology, and Centre for Biodiversity Analysis, Australian National University, Acton, ACT, Australia
| | - Ryan J Ellis
- Terrestrial Zoology, Western Australian Museum, Welshpool, WA, Australia.,Biologic Environmental Survey, East Perth, WA, Australia
| | - Paul Doughty
- Terrestrial Zoology, Western Australian Museum, Welshpool, WA, Australia
| | - Craig Moritz
- Division of Ecology and Evolution, Research School of Biology, and Centre for Biodiversity Analysis, Australian National University, Acton, ACT, Australia
| |
Collapse
|
9
|
Hammer MP, Adams M, Thacker CE, Johnson JB, Unmack PJ. Comparison of genetic structure in co-occurring freshwater eleotrids (Actinopterygii: Philypnodon) reveals cryptic species, likely translocation and regional conservation hotspots. Mol Phylogenet Evol 2019; 139:106556. [DOI: 10.1016/j.ympev.2019.106556] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 06/20/2019] [Accepted: 07/04/2019] [Indexed: 11/25/2022]
|
10
|
Arratia G, Quezada-Romegialli C. The South American and Australian percichthyids and perciliids. What is new about them? NEOTROPICAL ICHTHYOLOGY 2019. [DOI: 10.1590/1982-0224-20180102] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT A study including morphological characters and mitogenomics of South American and Australian fishes previously assigned to Percichthyidae was conducted. Results generated from these different data sets reveal major disagreements concerning the content and interpretation of the so-called percichthyids. A phylogenetic analysis based on 54 morphological characters suggests the existence of two major clades: (1) Percichthyidae, including the South American Percichthys and the Australian taxa Macquaria australasica, Macquaria (= Plectroplites), and Maccullochella; (2) Perciliidae with the South American genus Percilia at the base plus more advanced Australian genera Nannoperca, Nannatherina, Bostockia, and Gadopsis. In contrast, molecular and mitogenomic evidence suggests only one clade (Percichthyidae), with the exclusion of species of Macquaria (= Percalates). Additionally, the results reveal the existence of various taxonomic problems, such as the current interpretation of only one species of Percichthys in Argentina, an interpretation that is not supported by the present study; the existence of cryptic species of Percilia as well as of Gadopsis, Nannoperca, and Macquaria that will increase the diversity of the genera; and the need for an extensive revision of species previously assigned to Percalates versus Macquaria. Disagreements point to the need to develop further research on the so-called percichthyids and perciliids.
Collapse
|
11
|
Austin CM, Tan MH, Harrisson KA, Lee YP, Croft LJ, Sunnucks P, Pavlova A, Gan HM. De novo genome assembly and annotation of Australia's largest freshwater fish, the Murray cod (Maccullochella peelii), from Illumina and Nanopore sequencing read. Gigascience 2018; 6:1-6. [PMID: 28873963 PMCID: PMC5597895 DOI: 10.1093/gigascience/gix063] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 07/11/2017] [Indexed: 12/02/2022] Open
Abstract
One of the most iconic Australian fish is the Murray cod, Maccullochella peelii (Mitchell 1838), a freshwater species that can grow to ∼1.8 metres in length and live to age ≥48 years. The Murray cod is of a conservation concern as a result of strong population contractions, but it is also popular for recreational fishing and is of growing aquaculture interest. In this study, we report the whole genome sequence of the Murray cod to support ongoing population genetics, conservation, and management research, as well as to better understand the evolutionary ecology and history of the species. A draft Murray cod genome of 633 Mbp (N50 = 109 974bp; BUSCO and CEGMA completeness of 94.2% and 91.9%, respectively) with an estimated 148 Mbp of putative repetitive sequences was assembled from the combined sequencing data of 2 fish individuals with an identical maternal lineage; 47.2 Gb of Illumina HiSeq data and 804 Mb of Nanopore data were generated from the first individual while 23.2 Gb of Illumina MiSeq data were generated from the second individual. The inclusion of Nanopore reads for scaffolding followed by subsequent gap-closing using Illumina data led to a 29% reduction in the number of scaffolds and a 55% and 54% increase in the scaffold and contig N50, respectively. We also report the first transcriptome of Murray cod that was subsequently used to annotate the Murray cod genome, leading to the identification of 26 539 protein-coding genes. We present the whole genome of the Murray cod and anticipate this will be a catalyst for a range of genetic, genomic, and phylogenetic studies of the Murray cod and more generally other fish species of the Percichthydae family.
Collapse
Affiliation(s)
- Christopher M Austin
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3220, Australia.,Genomics Facility, Tropical Medicine and Biology Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia.,School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia
| | - Mun Hua Tan
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3220, Australia.,Genomics Facility, Tropical Medicine and Biology Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia.,School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia
| | - Katherine A Harrisson
- School of Biological Sciences, Monash University, Clayton Campus, Clayton, Victoria, Australia
| | - Yin Peng Lee
- Genomics Facility, Tropical Medicine and Biology Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia.,School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia
| | - Laurence J Croft
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia.,Malaysian Genomics Resource Centre Berhad, Boulevard Signature Office, Kuala Lumpur, Malaysia
| | - Paul Sunnucks
- School of Biological Sciences, Monash University, Clayton Campus, Clayton, Victoria, Australia
| | - Alexandra Pavlova
- School of Biological Sciences, Monash University, Clayton Campus, Clayton, Victoria, Australia
| | - Han Ming Gan
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Geelong, Victoria 3220, Australia.,Genomics Facility, Tropical Medicine and Biology Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia.,School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Petaling Jaya, Selangor, Malaysia
| |
Collapse
|
12
|
Gruber B, Unmack PJ, Berry OF, Georges A. dartr
: An r
package to facilitate analysis of SNP data generated from reduced representation genome sequencing. Mol Ecol Resour 2018; 18:691-699. [DOI: 10.1111/1755-0998.12745] [Citation(s) in RCA: 279] [Impact Index Per Article: 46.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 12/05/2017] [Accepted: 12/11/2017] [Indexed: 12/01/2022]
Affiliation(s)
- Bernd Gruber
- Institute for Applied Ecology; University of Canberra; Canberra ACT Australia
| | - Peter J. Unmack
- Institute for Applied Ecology; University of Canberra; Canberra ACT Australia
| | - Oliver F. Berry
- CSIRO Environomics Future Science Platform; Indian Ocean Marine Research Centre; The University of Western Australia (M097); Crawley WA Australia
| | - Arthur Georges
- Institute for Applied Ecology; University of Canberra; Canberra ACT Australia
| |
Collapse
|
13
|
Artificial barriers prevent genetic recovery of small isolated populations of a low-mobility freshwater fish. Heredity (Edinb) 2018; 120:515-532. [PMID: 29326479 PMCID: PMC5943333 DOI: 10.1038/s41437-017-0008-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/05/2017] [Accepted: 09/08/2017] [Indexed: 11/08/2022] Open
Abstract
Habitat loss and fragmentation often result in small, isolated populations vulnerable to environmental disturbance and loss of genetic diversity. Low genetic diversity can increase extinction risk of small populations by elevating inbreeding and inbreeding depression, and reducing adaptive potential. Due to their linear nature and extensive use by humans, freshwater ecosystems are especially vulnerable to habitat loss and fragmentation. Although the effects of fragmentation on genetic structure have been extensively studied in migratory fishes, they are less understood in low-mobility species. We estimated impacts of instream barriers on genetic structure and diversity of the low-mobility river blackfish (Gadopsis marmoratus) within five streams separated by weirs or dams constructed 45-120 years ago. We found evidence of small-scale (<13 km) genetic structure within reaches unimpeded by barriers, as expected for a fish with low mobility. Genetic diversity was lower above barriers in small streams only, regardless of barrier age. In particular, one isolated population showed evidence of a recent bottleneck and inbreeding. Differentiation above and below the barrier (FST = 0.13) was greatest in this stream, but in other streams did not differ from background levels. Spatially explicit simulations suggest that short-term barrier effects would not be detected with our data set unless effective population sizes were very small (<100). Our study highlights that, in structured populations, the ability to detect short-term genetic effects from barriers is reduced and requires more genetic markers compared to panmictic populations. We also demonstrate the importance of accounting for natural population genetic structure in fragmentation studies.
Collapse
|