Historic DNA reveals contemporary population structure results from anthropogenic effects, not pre-fragmentation patterns

Tracy, Lisa N.; Jamieson, Ian G.

doi:10.1007/s10592-010-0158-9

Cited by 55 publications

(26 citation statements)

References 49 publications

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“…While a number of aDNA studies have detected temporal geographic range reductions in vertebrate taxa, and corresponding losses of genetic diversity (De Bruyn et al . ; Tracy & Jamieson ; Shepherd et al . ), few if any have detected such markedly distinct demographic histories in two such proximate and ecologically comparable vertebrate lineages.…”

Section: Discussionmentioning

confidence: 99%

Geographically contrasting biodiversity reductions in a widespread New Zealand seabird

et al. 2015

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Unravelling prehistoric anthropogenic impacts on biodiversity represents a key challenge for biologists and archaeologists. New Zealand's endemic Stewart Island Shag (Leucocarbo chalconotus) comprises two distinct phylogeographic lineages, currently restricted to the country's south and southeast. However, fossil and archaeological remains suggest a far more widespread distribution at the time of Polynesian settlement ca. 1280 AD, encompassing much of coastal South Island. We used modern and ancient DNA, radiocarbon dating, and Bayesian modelling, to assess the impacts of human arrival on this taxon. Our analyses show that the southeast South Island (Otago) lineage was formerly widespread across coastal South Island, but experienced dramatic population extinctions, range retraction and lineage loss soon after human arrival. By comparison, the southernmost (Foveaux Strait) lineage has experienced a relatively stable demographic and biogeographic history since human arrival, retaining much of its mitochondrial diversity. Archaeological data suggest that these contrasting demographic histories (retraction vs. stability) reflect differential human impacts in mainland South Island vs. Foveaux Strait, highlighting the importance of testing for temporal and spatial variation in human-driven faunal declines.

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Section: Discussionmentioning

confidence: 99%

Geographically contrasting biodiversity reductions in a widespread New Zealand seabird

et al. 2015

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“…; Allendorf et al . ; Tracy & Jamieson ; Rosvold et al . ), but our data does not allow to assess the importance of the recent decline played in the contemporary population structure.…”

Section: Discussionmentioning

confidence: 99%

“…), but our data does not allow to assess the importance of the recent decline played in the contemporary population structure. For instance studies on the Mohua ( Mohoua ochrocephala ) (Tracy & Jamieson ), the Spanish imperial eagle ( Aquila adalberti ) (Martinez‐Cruz et al . ) or the red deer ( Cervus elaphus ) (Rosvold et al .…”

Section: Discussionmentioning

confidence: 99%

Postglacial expansion and not human influence best explains the population structure in the endangered kea (Nestor notabilis)

2014

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Inferring past demography is a central question in evolutionary and conservation biology. It is, however, sometimes challenging to infer the processes that shaped the current patterns of genetic variation in endangered species. Population substructuring can occur as a result of survival in several isolated refugia and subsequent recolonization processes or via genetic drift following a population decline. The kea (Nestor notabilis) is an endemic parrot widely distributed in the mountains of the South Island of New Zealand that has gone through a major human-induced population decline during the 1860s-1970s. The aims of this study were to understand the glacial and postglacial history of kea and to determine whether the recent population decline played a role in the shaping of the current genetic variation. We examined the distribution of genetic variation, differentiation and admixture in kea using 17 microsatellites and the mitochondrial control region. Mitochondrial data showed a shallow phylogeny and a genetic distinction between the North and South of the range consistent with the three genetic clusters identified with microsatellite data. Both marker types indicated an increase in genetic isolation by geographic distance. Approximate Bayesian Computation supported a scenario of postglacial divergence from a single ancestral glacial refugium, suggesting that the contemporary genetic structure has resulted from recolonization processes rather than from a recent population decline. The recent evolutionary origin of this genetic structure suggests that each genetic cluster does not need to be considered as independent conservation units.

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“…Several empirical studies of terrestrial vertebrates support this finding and showed that genetic structure between populations fragmented within the last 100 years (e.g. Riley et al ., ; Zellmer & Knowles, ; Tracy & Jamieson, ). Collectively, the results from this study and a recent body of work on similar stream‐inhabiting fishes (i.e.…”

Section: Discussionmentioning

confidence: 99%

The effects of riverine impoundment on genetic structure and gene flow in two stream fishes in the Mobile River basin

2013

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Summary Riverine impoundments (reservoirs) are thought to impede natural migration in small‐stream‐inhabiting fishes, resulting in spatially and genetically fragmented populations. However, this hypothesis remains poorly tested, and the genetic consequences of riverine impoundment for stream fishes with differing dispersal capabilities are not well understood. This study utilised a combination of microsatellite DNA loci from 479 individuals and the mitochondrial (mt) DNA cytochrome b gene (810–1140 bp) from 83 individuals from eight streams to compare genetic structure and diversity between reservoir‐fragmented and non‐fragmented groups of two species of stream fishes with differing dispersal capabilities in the Mobile River basin of the south‐eastern United States. For both species, analysis of microsatellite loci revealed genetic discontinuities between neighbouring tributaries that have been fragmented by reservoir construction. This finding was in stark contrast to the high degree of continuity for both species between reference tributaries in a natural river setting. Results from mtDNA revealed no significant genetic structure within reservoir‐fragmented or non‐fragmented groups, indicating a lack of historical genetic structure (i.e. prior to reservoir construction). Microsatellite‐based estimates of genetic diversity and migration were differentially affected in the two species, indicating that stream fishes with relatively high dispersal abilities may be equally or more susceptible to reservoir fragmentation when compared to species with relatively low dispersal abilities. Collectively, our data revealed that riverine impoundment and reservoir‐induced habitat fragmentation adversely affect genetic characteristics in small‐stream‐inhabiting fishes. This is of particular interest in biodiversity hotspots such as the south‐eastern United States where hydroelectric and recreational reservoirs restrict connectivity in aquatic systems.

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Historic DNA reveals contemporary population structure results from anthropogenic effects, not pre-fragmentation patterns

Cited by 55 publications

References 49 publications

Geographically contrasting biodiversity reductions in a widespread New Zealand seabird

Geographically contrasting biodiversity reductions in a widespread New Zealand seabird

Postglacial expansion and not human influence best explains the population structure in the endangered kea (Nestor notabilis)

The effects of riverine impoundment on genetic structure and gene flow in two stream fishes in the Mobile River basin

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