2015
DOI: 10.1111/mec.13083
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A test of the central–marginal hypothesis using population genetics and ecological niche modelling in an endemic salamander (Ambystoma barbouri)

Abstract: The central-marginal hypothesis (CMH) predicts that population size, genetic diversity and genetic connectivity are highest at the core and decrease near the edges of species' geographic distributions. We provide a test of the CMH using three replicated core-to-edge transects that encompass nearly the entire geographic range of the endemic streamside salamander (Ambystoma barbouri). We confirmed that the mapped core of the distribution was the most suitable habitat using ecological niche modelling (ENM) and vi… Show more

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Cited by 42 publications
(86 citation statements)
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References 69 publications
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“…USA mangroves also provide three natural replicates of core to margin distribution ranges. Comparing variation across multiple distributions of the same species can provide greater insights into the processes shaping genetic change (Griffin & Willi, ; Kennedy et al, ; Leydet, Grupstra, Coma, Ribes, & Hellberg, ; Micheletti & Storfer, ). For instance, West Florida (WFL) and East Florida (EFL) exhibited a similar decline in neutral genetic diversity, with reductions in mean allelic richness of almost 50% from south to north, and greatest intersite differentiation at the northern range margins, consistent with latitudinal reductions in mangrove abundances along these coastlines (Osland, Feher, et al, ).…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…USA mangroves also provide three natural replicates of core to margin distribution ranges. Comparing variation across multiple distributions of the same species can provide greater insights into the processes shaping genetic change (Griffin & Willi, ; Kennedy et al, ; Leydet, Grupstra, Coma, Ribes, & Hellberg, ; Micheletti & Storfer, ). For instance, West Florida (WFL) and East Florida (EFL) exhibited a similar decline in neutral genetic diversity, with reductions in mean allelic richness of almost 50% from south to north, and greatest intersite differentiation at the northern range margins, consistent with latitudinal reductions in mangrove abundances along these coastlines (Osland, Feher, et al, ).…”
Section: Discussionmentioning
confidence: 99%
“…However, this assumed pattern occurs much less often than previously expected (Sagarin & Gaines, ; Santini, Pironon, Maiorano, & Thuiller, ). Quantitative approaches have addressed this issue with evidence‐based estimates of range centre considering species biology (Schwartz, Mills, Ortega, Ruggiero, & Allendorf, ), climatic suitability (Lira‐Noriega & Manthey, ; Micheletti & Storfer, ), and genetic differences (Griffin & Willi, ); and have demonstrated that disentangling the relative effects of geographic, ecological, and historical gradients is often difficult when interpreting patterns across broad spatial scales (Pironon, Villellas, Morris, Doak, & García, ). Another means to achieve greater insight into the generality and implications of CMH would be to identify model systems that naturally conform to “abundant‐centre” assumptions and provide a test of this theory with less influence of confounding factors.…”
Section: Introductionmentioning
confidence: 99%
“…; Martínez‐Meyer et al . ; Lira‐Noriega & Manthley 2013; Micheletti & Storfor ; Ortego et al . ; Pironon et al .…”
Section: Introductionunclassified
“…). These localities span from the centre of the species' distribution to each of the western, northern and southern edges (Micheletti & Storfer ). We obtained a total of 1604 genetic samples (truexfalse¯ = 21 per locality) consisting of eggs and larval and adult tail tips.…”
Section: Methodsmentioning
confidence: 99%
“…Admixture plots (determined by BAPS ) correspond with the south cluster (green), centre cluster (red) and north cluster (blue). The yellow star indicates the centroid of the core of the species' distribution (Micheletti & Storfer ). [Colour figure can be viewed at wileyonlinelibrary.com].…”
Section: Introductionmentioning
confidence: 99%