Population Genetic Structure of the New Zealand Estuarine Clam Austrovenus stutchburyi (Bivalvia: Veneridae) Reveals Population Subdivision and Partial Congruence with Biogeographic Boundaries

Ross, Philip M.; Hogg, Ian D.; Pilditch, Conrad A.; Lundquist, Carolyn J.; Wilkins, Richard J.

doi:10.1007/s12237-011-9429-z

Cited by 40 publications

(38 citation statements)

References 78 publications

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“…For example, a similar pattern of low differentiation of the Chatham Islands from the mainland was observed among populations of the bivalve Austrovenus stutchburyi (Ross et al . ) and also blue mussels Mytilus galloprovincialis (Westfall ), both of which have larval duration periods similar to P. novaezelandiae . However, for Paphies subtriangulata , also with a similar pelagic larval duration, there is evidence of a strong genetic break between the Chatham Islands and mainland New Zealand (Hannan ), which can be the result of its older evolutionary history (approx.…”

Section: Discussionmentioning

confidence: 99%

Emerging patterns of genetic variation in the New Zealand endemic scallop Pecten novaezelandiae

Silva

Gardner

2015

Molecular Ecology

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Both historical and contemporary processes influence the genetic structure of species, but the relative roles of such processes are still difficult to access. Population genetic studies of species with recent evolutionary histories such as the New Zealand endemic scallop Pecten novaezelandiae (<1 Ma) permit testing of the effects of recent processes affecting gene flow and shaping genetic structure. In addition, studies encompassing the entire distributional range of species can provide insight into colonization processes. Analyses of genetic variation in P. novaezelandiae (952 individuals from 14 locations, genotyped at 10 microsatellite loci) revealed a weak but significant regional structure across the distributional range of the species, as well as latitudinal gradients of genetic diversity and differentiation: estimates of migration rates supported these patterns. Our results suggest that the observed genetic structure and latitudinal gradients reflect a stepping-stone model of colonization (north to south) and emerging divergence of populations as a result of ongoing limitations to gene flow and insufficient time to reach migration-drift equilibrium. The low levels of interpopulation and interregional genetic differentiation detected over hundreds of kilometres reflect the recent evolutionary history of P. novaezelandiae and stand in contrast to patterns reported for other evolutionary older species at the same spatial scale. The outcomes of this study contribute to a better understanding of evolutionary processes influencing the genetic variation of species and provide vital information on the genetic structure of P. novaezelandiae.

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Section: Discussionmentioning

confidence: 99%

Emerging patterns of genetic variation in the New Zealand endemic scallop Pecten novaezelandiae

Silva

Gardner

2015

Molecular Ecology

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“…Manuscript to be reviewed Ross et al 2012;Sponer & Roy 2002;Veale & Lavery 2011;Waters & Roy 2004), particularly down the east coast of New Zealand where currents are stronger than on the west (Heath 1985;Stanton 1976). Previous work in direct developing marine invertebrates suggests that ocean currents and upwelling regions (Fig.…”

Section: Population Connectivity and Gene Flowmentioning

confidence: 99%

Peer Review #1 of "Contrasting gene flow at different spatial scales revealed by genotyping-by-sequencing in Isocladus armatus, a massively colour polymorphic New Zealand marine isopod (v0.1)"

2018

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Understanding how genetic diversity is maintained within populations is central to evolutionary biology. Colour polymorphism (CP) research, which typically has a genetic basis, can shed light on this issue. However, because gene flow can homogenise genetic variation, understanding population connectivity is critical in examining the maintenance of polymorphisms. In this study we assess the utility of genotyping-by-sequencing to resolve gene flow, and provide a preliminary investigation into the genetic basis of CP in Isocladus armatus, an endemic New Zealand marine isopod. Analysis of the genetic variation in 4,000 single nucleotide polymorphisms (SNPs) within and among populations and colour morphs revealed large differences in gene flow across two spatial scales. Marine isopods, which lack a pelagic larval phase, are typically assumed to exhibit greater population structuring than marine invertebrates possessing a biphasic life cycle. However, we found high gene flow rates and no genetic subdivision between two North Island populations situated 8 km apart. This suggests that I. armatus is capable of substantial dispersal along coastlines. In contrast, we identified a strong genetic disjunction between North and South Island populations. This result is similar to those reported in other New Zealand marine species, and is congruent with the presence of a geophysical barrier to dispersal down the east coast of New Zealand. We also found some support for a genetic basis to colouration evidenced by positive F ST outlier tests, with two SNPs in particular showing strong association to the expression of a striped morph. Our study provides one of the first population genomic studies of a marine organism in New Zealand, and suggests that genotyping-by-sequencing can be a good alternative to more traditional investigations based on traditional markers such as microsatellites. Our study provides a foundation for further development of a highly tractable system for research on the evolutionary maintenance of CP.

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“…While this is broadly consistent with mtDNA results for these species, especially F. capito, and some north-south differences between the Islands were found in some of the other triplefin species examined (Hickey et al 2009), such divergence was not the major population division seen with mtDNA in either F. lapillum or F. capito. A genetic disjunction near Cook Strait has been found in a number of marine invertebrate taxa (Ross et al 2012;Veale and Lavery 2012;Wei et al 2013), suggesting it may be a common barrier to gene flow. The trend has been attributed to upwelling currents reducing larval transport between the islands (Goldstien et al 2006;Veale and Lavery 2012).…”

Section: Regional-scale Population Structurementioning

confidence: 99%

Discordance between nuclear and mitochondrial DNA analyses of population structure in closely related triplefin fishes (Forsterygion lapillum and F. capito, F. Tripterygiidae) supports speciation with gene flow

et al. 2015

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breaks, and far less structure is evident than in the mtDNA data. Further, we found a lack of structure over local scales in F. lapillum, suggesting extensive gene flow over tens of kilometres. Our findings suggest a pattern of steppingstone dispersal and contiguous gene flow, sometimes over large distances, supporting the hypothesis that factors other than geographic isolation, such as ecological speciation with gene flow, have been important in the evolution of this group.

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Population Genetic Structure of the New Zealand Estuarine Clam Austrovenus stutchburyi (Bivalvia: Veneridae) Reveals Population Subdivision and Partial Congruence with Biogeographic Boundaries

Cited by 40 publications

References 78 publications

Emerging patterns of genetic variation in the New Zealand endemic scallop Pecten novaezelandiae

Emerging patterns of genetic variation in the New Zealand endemic scallop Pecten novaezelandiae

Peer Review #1 of "Contrasting gene flow at different spatial scales revealed by genotyping-by-sequencing in Isocladus armatus, a massively colour polymorphic New Zealand marine isopod (v0.1)"

Discordance between nuclear and mitochondrial DNA analyses of population structure in closely related triplefin fishes (Forsterygion lapillum and F. capito, F. Tripterygiidae) supports speciation with gene flow

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