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DiBattista JD, Fowler AM, Riley IJ, Reader S, Hay A, Parkinson K, Hobbs JPA. The use of environmental DNA to monitor impacted coastal estuaries. MARINE POLLUTION BULLETIN 2022; 181:113860. [PMID: 35779383 DOI: 10.1016/j.marpolbul.2022.113860] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 06/13/2022] [Accepted: 06/14/2022] [Indexed: 06/15/2023]
Abstract
Environmental DNA (eDNA) metabarcoding is increasingly being used to assess community composition in coastal ecosystems. In this study, we chose to examine temporal and spatial changes in the aquatic community of Manly Lagoon - one of the most heavily developed and polluted estuaries in eastern Australia. Based on metabarcoding of the 16S mitochondrial gene (for fish) and the 18S nuclear gene (for macroinvertebrates), we identified seasonal differences in fish and macroinvertebrate community composition as well as species richness, which correlated, in some cases, with the environmental parameters of sea surface temperature and freshwater input. Moreover, given the greater taxonomic resolution of fish versus macroinvertebrate assignments, we identified several known migratory fish species of management importance that contributed significantly to the overall patterns observed. Overall, our data support the use of eDNA metabarcoding to track fish assemblages shifting in response to environmental drivers in polluted estuaries with increased sampling and consultation with historical data.
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Affiliation(s)
- Joseph D DiBattista
- Australian Museum Research Institute, Australian Museum, Sydney, NSW 2010, Australia.
| | - Ashley M Fowler
- New South Wales Department of Primary Industries, Sydney Institute of Marine Science, Mosman, NSW 2088, Australia
| | - Indiana J Riley
- School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia; Sydney Institute of Marine Science, Mosman, NSW 2088, Australia
| | - Sally Reader
- Australian Museum Research Institute, Australian Museum, Sydney, NSW 2010, Australia
| | - Amanda Hay
- Australian Museum Research Institute, Australian Museum, Sydney, NSW 2010, Australia
| | - Kerryn Parkinson
- Australian Museum Research Institute, Australian Museum, Sydney, NSW 2010, Australia
| | - Jean-Paul A Hobbs
- School of Biological Sciences, University of Queensland, Brisbane, QLD 4069, Australia
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Hammer MP, Adams M, Unmack PJ, Hassell KL, Bertozzi T. Surprising Pseudogobius: Molecular systematics of benthic gobies reveals new insights into estuarine biodiversity (Teleostei: Gobiiformes). Mol Phylogenet Evol 2021; 160:107140. [PMID: 33711446 DOI: 10.1016/j.ympev.2021.107140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 02/22/2021] [Accepted: 03/01/2021] [Indexed: 10/21/2022]
Abstract
Snubnose gobies (genus Pseudogobius: Gobionellinae) are ubiquitous to, and important components of, estuarine ecosystems of the Indo-west Pacific. These small benthic fishes occur in freshwater, brackish and marine habitats such as mangroves, sheltered tide pools and lowland streams, and represent a model group for understanding the biodiversity and biogeography of estuarine fauna. To develop the species-level framework required for a concurrent morphological taxonomic appraisal, we undertook thorough sampling around the extensive Australian coastline, referenced to international locations, as part of a molecular systematic review using both nuclear and mitochondrial markers. The results indicate that while there are currently eight recognised species, the true diversity is close to double this, with a hotspot of endemism located in Australia. Complicated patterns were observed in southern Australia owing to two differing zones of introgression/admixture. Key drivers of diversity in the group appear to include plate tectonics, latitude, and historic barriers under glacial maxima, where an interplay between ready dispersal and habitat specialisation has led to regional panmixia but frequent geographic compartmentalisation within past and present landscapes. The findings have significant implications for biodiversity conservation, coastal and estuarine development, the basic foundations of field ecology, and for applied use such as in biomonitoring.
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Affiliation(s)
- Michael P Hammer
- Museum and Art Gallery of the Northern Territory, Darwin, Northern Territory 0801, Australia; Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia.
| | - Mark Adams
- Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia; School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Peter J Unmack
- Centre for Applied Water Science, Institute for Applied Ecology, University of Canberra, ACT 2601, Australia
| | - Kathryn L Hassell
- Centre for Aquatic Pollution Identification and Management, School of Biosciences, The University of Melbourne, Parkville, Victoria 3010, Australia; Aquatic Environmental Stress Research Group, School of Science, Royal Melbourne Institute of Technology University, Melbourne, Victoria 3083, Australia
| | - Terry Bertozzi
- Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia; School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
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McColl-Gausden EF, Weeks AR, Coleman RA, Robinson KL, Song S, Raadik TA, Tingley R. Multispecies models reveal that eDNA metabarcoding is more sensitive than backpack electrofishing for conducting fish surveys in freshwater streams. Mol Ecol 2020; 30:3111-3126. [PMID: 32966639 DOI: 10.1111/mec.15644] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 08/20/2020] [Accepted: 08/26/2020] [Indexed: 12/26/2022]
Abstract
Environmental DNA (eDNA) sampling can provide accurate, cost-effective, landscape-level data on species distributions. Previous studies have compared the sensitivity of eDNA sampling to traditional sampling methods for single species, but similar comparative studies on multispecies eDNA metabarcoding are rare. Using hierarchical site occupancy detection models, we examined whether key choices associated with eDNA metabarcoding (primer selection, low-abundance read filtering and the number of positive water samples used to classify a species as present at a site) affect the sensitivity of metabarcoding, relative to backpack electrofishing for fish in freshwater streams. Under all scenarios (teleostei and vertebrate primers; 0%, 0.1% and 1% read filtering thresholds; one or two positive samples required to classify species as present), we found that eDNA metabarcoding is, on average, more sensitive than electrofishing. Combining vertebrate and teleostei markers resulted in higher detection probabilities relative to the use of either marker in isolation. Increasing the threshold used to filter low-abundance reads decreased species detection probabilities but did not change our overall finding that eDNA metabarcoding was more sensitive than electrofishing. Using a threshold of two positive water samples (out of five) to classify a species as present typically had negligible effects on detection probabilities compared to using one positive water sample. Our findings demonstrate that eDNA metabarcoding is generally more sensitive than electrofishing for conducting fish surveys in freshwater streams, and that this outcome is not sensitive to methodological decisions associated with metabarcoding.
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Affiliation(s)
| | - Andrew R Weeks
- School of BioSciences, University of Melbourne, Parkville, VIC, Australia.,cesar Pty Ltd, Parkville, VIC, Australia
| | | | - Katie L Robinson
- School of BioSciences, University of Melbourne, Parkville, VIC, Australia
| | - Sue Song
- cesar Pty Ltd, Parkville, VIC, Australia
| | - Tarmo A Raadik
- Department of Environment, Land, Water and Planning, Arthur Rylah Institute for Environmental Research, Heidelberg, VIC, Australia
| | - Reid Tingley
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
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Yuan N, Sun Y, Comes HP, Fu CX, Qiu YX. Understanding population structure and historical demography in a conservation context: population genetics of the endangered Kirengeshoma palmata (Hydrangeaceae). AMERICAN JOURNAL OF BOTANY 2014; 101:521-529. [PMID: 24650862 DOI: 10.3732/ajb.1400043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PREMISE OF THE STUDY Both historical and contemporary microevolutionary processes greatly influence the genetic patterns of East Asian plant endemics, but the spatial and temporal contexts of these processes remain poorly understood. Here, we investigate the relative influences of historical and contemporary gene flow and drift on the population genetic structure of Kirengeshoma palmata, a perennial herb from East China and South Japan. METHODS We used data from nine polymorphic microsatellite loci to assess the levels of genetic diversity, effective population size, and contemporary and historical gene flow for six of the seven known populations. KEY RESULTS We found high levels of inbreeding and allelic diversity within populations. Both contemporary and historical migration rates among populations were low, and a test of alternate models of population history strongly favored a model of long-term drift-migration equilibrium. We inferred declines in population size ca. 10,000-100,000 yr ago, but failed to detect recent declines. Bayesian clustering divided K. palmata populations into three genetic clusters, two of which were consistent with a glacial refugium hypothesis for two mountain ranges in East China. CONCLUSIONS These results suggest that anthropogenic fragmentation has had little effect on the genetic characteristics of Chinese K. palmata. Rather, past decline in population size due to Late Pleistocene climate change as well as restricted pollen and seed dispersal may have contributed to low levels of both historical and contemporary gene flow, resulting in high genetic differentiation between adjacent mountain ranges due to genetic drift and inbreeding.
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Affiliation(s)
- Na Yuan
- Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education, and College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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Miller AD, Versace VL, Matthews TG, Montgomery S, Bowie KC. Ocean currents influence the genetic structure of an intertidal mollusc in southeastern Australia - implications for predicting the movement of passive dispersers across a marine biogeographic barrier. Ecol Evol 2013; 3:1248-61. [PMID: 23762511 PMCID: PMC3678479 DOI: 10.1002/ece3.535] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 02/14/2013] [Indexed: 12/04/2022] Open
Abstract
Major disjunctions among marine communities in southeastern Australia have been well documented, although explanations for biogeographic structuring remain uncertain. Converging ocean currents, environmental gradients, and habitat discontinuities have been hypothesized as likely drivers of structuring in many species, although the extent to which species are affected appears largely dependent on specific life histories and ecologies. Understanding these relationships is critical to the management of native and invasive species, and the preservation of evolutionary processes that shape biodiversity in this region. In this study we test the direct influence of ocean currents on the genetic structure of a passive disperser across a major biogeographic barrier. Donax deltoides (Veneroida: Donacidae) is an intertidal, soft-sediment mollusc and an ideal surrogate for testing this relationship, given its lack of habitat constraints in this region, and its immense dispersal potential driven by year-long spawning and long-lived planktonic larvae. We assessed allele frequencies at 10 polymorphic microsatellite loci across 11 sample locations spanning the barrier region and identified genetic structure consistent with the major ocean currents of southeastern Australia. Analysis of mitochondrial DNA sequence data indicated no evidence of genetic structuring, but signatures of a species range expansion corresponding with historical inundations of the Bassian Isthmus. Our results indicate that ocean currents are likely to be the most influential factor affecting the genetic structure of D. deltoides and a likely physical barrier for passive dispersing marine fauna generally in southeastern Australia.
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Affiliation(s)
- Adam D Miller
- Department of Zoology, The University of Melbourne Parkville, Melbourne, Victoria, 3010, Australia ; School of Life and Environmental Sciences, Deakin University Warrnambool, Victoria, 3280, Australia
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Testing for hybridization and assessing genetic diversity in Morelet’s crocodile (Crocodylus moreletii) populations from central Veracruz. CONSERV GENET 2012. [DOI: 10.1007/s10592-012-0406-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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