Phylogeography across a continent: The evolutionary and demographic history of the North American racer (Serpentes: Colubridae: Coluber constrictor)

Burbrink, Frank T.; Fontanella, Frank M.; Pyron, R. Alexander; Guiher, Timothy J.; Jimenez, Cynthia A.

doi:10.1016/j.ympev.2007.10.020

Cited by 76 publications

(74 citation statements)

References 68 publications

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“…Some studies have also shown that for snake lineages, those with larger ranges generally have a higher N e (e.g., [8]), although this trend is not consistent among taxa (e.g., [89]). Despite a general lack of correlation between range size and population size in milksnakes, we do find the temperate species did have greater ranges and larger mean effective population sizes.…”

Section: Discussionmentioning

confidence: 99%

Independent Demographic Responses to Climate Change among Temperate and Tropical Milksnakes (Colubridae: Genus Lampropeltis)

2015

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The effects of Late Quaternary climate change have been examined for many temperate New World taxa, but the impact of Pleistocene glacial cycles on Neotropical taxa is less well understood, specifically with respect to changes in population demography. Here, we examine historical demographic trends for six species of milksnake with representatives in both the temperate and tropical Americas to determine if species share responses to climate change as a taxon or by area (i.e., temperate versus tropical environments). Using a multilocus dataset, we test for the demographic signature of population expansion and decline using non-genealogical summary statistics, as well as coalescent-based methods. In addition, we determine whether range sizes are correlated with effective population sizes for milksnakes. Results indicate that there are no identifiable trends with respect to demographic response based on location, and that species responded to changing climates independently, with tropical taxa showing greater instability. There is also no correlation between range size and effective population size, with the largest population size belonging to the species with the smallest geographic distribution. Our study highlights the importance of not generalizing the demographic histories of taxa by region and further illustrates that the New World tropics may not have been a stable refuge during the Pleistocene.

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Section: Discussionmentioning

confidence: 99%

Independent Demographic Responses to Climate Change among Temperate and Tropical Milksnakes (Colubridae: Genus Lampropeltis)

2015

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“…S. alata is the only Sarracenia species west of the Mississippi river (MacRoberts and MacRoberts 1991) and most populations in Louisiana are monotypic for S. alata, greatly reducing the potential that interspecific hybridization will confound results in this study. S. alata is absent from the Mississippi River flood plains, due to of a lack of suitable habitat (Sheridan 1991), and this large river has been identified as a major barrier to gene flow in other organisms (Near et al 2001;Al-Rabab'ah and Williams 2002;Soltis et al 2006;Burbrink et al 2008). While populations of S. alata are separated by up to 200 km, no morphological traits have been identified that distinguish eastern individuals from western individuals (Sheridan 1991).…”

Section: Introductionmentioning

confidence: 99%

Conservation genetic inferences in the carnivorous pitcher plant Sarracenia alata (Sarraceniaceae)

Koopman

Carstens

2010

Conserv Genet

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Conservation geneticists make inferences about their focal species from genetic data, and then use these inferences to inform conservation decisions. Since different biological processes can produce similar patterns of genetic diversity, we advocate an approach to data analysis that considers the full range of evolutionary forces and attempts to evaluate their relative contributions in an objective manner. Here we collect data from microsatellites and chloroplast loci and use these data to explore models of historical demography in the carnivorous Pitcher Plant, Sarracenia alata. Findings indicate that populations of S. alata exhibit high degrees of population genetic structure, likely caused by dispersal limitation, and that population sizes have decreased in western populations and increased in eastern populations. These results provide new insight to the management and conservation of plants restricted to small, declining populations isolated in increasingly scarce and highly threatened habitat, including other rare and endangered species of Sarracenia.

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“…5.6–2.6 Ma; Randazzo 1997). Glacial–interglacial cycles and the formation and rearrangement of rivers and embayments intensified barriers to dispersal and affected the phylogeographic patterns of many organisms in the southeastern United States (Soltis et al 2006; Burbrink et al 2008). A major geographic barrier like the ARD might influence historical processes such as population subdivision, long distance dispersal, or range expansion.…”

Section: Introductionmentioning

confidence: 99%

Reevaluation of a classic phylogeographic barrier: new techniques reveal the influence of microgeographic climate variation on population divergence

Soto‐Centeno

Barrow

Allen

et al. 2013

Ecology and Evolution

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We evaluated the mtDNA divergence and relationships within Geomys pinetis to assess the status of formerly recognized Geomys taxa. Additionally, we integrated new hypothesis-based tests in ecological niche models (ENM) to provide greater insight into causes for divergence and potential barriers to gene flow in Southeastern United States (Alabama, Florida, and Georgia). Our DNA sequence dataset confirmed and strongly supported two distinct lineages within G. pinetis occurring east and west of the ARD. Divergence date estimates showed that eastern and western lineages diverged about 1.37 Ma (1.9 Ma–830 ka). Predicted distributions from ENMs were consistent with molecular data and defined each population east and west of the ARD with little overlap. Niche identity and background similarity tests were statistically significant suggesting that ENMs from eastern and western lineages are not identical or more similar than expected based on random localities drawn from the environmental background. ENMs also support the hypothesis that the ARD represents a ribbon of unsuitable climate between more suitable areas where these populations are distributed. The estimated age of divergence between eastern and western lineages of G. pinetis suggests that the divergence was driven by climatic conditions during Pleistocene glacial–interglacial cycles. The ARD at the contact zone of eastern and western lineages of G. pinetis forms a significant barrier promoting microgeographic isolation that helps maintain ecological and genetic divergence.

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Phylogeography across a continent: The evolutionary and demographic history of the North American racer (Serpentes: Colubridae: Coluber constrictor)

Cited by 76 publications

References 68 publications

Independent Demographic Responses to Climate Change among Temperate and Tropical Milksnakes (Colubridae: Genus Lampropeltis)

Independent Demographic Responses to Climate Change among Temperate and Tropical Milksnakes (Colubridae: Genus Lampropeltis)

Conservation genetic inferences in the carnivorous pitcher plant Sarracenia alata (Sarraceniaceae)

Reevaluation of a classic phylogeographic barrier: new techniques reveal the influence of microgeographic climate variation on population divergence

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