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80 results for “geographical isolation”
Figure 1 in Isolation by geographical distance after release from Pleistocene refugia explains genetic and phenotypic variation in Xylotrupes siamensis (Coleoptera: Scarabaeidae)
Figure 1. Different male horn phenotypes in Xylotrupes siamensis. Left panels show exemplars of males of the Tonkinensis (short horn) phenotypes and right panels the Siamensis (long horn with a cephalic horn denticle) phenotype. Samples from the CLAOS population (for details, see Table 1; Fig. 2) exhibit intermediate horn length, and the major males have the cephalic horn denticle.
Figure 4 in Isolation by geographical distance after release from Pleistocene refugia explains genetic and phenotypic variation in Xylotrupes siamensis (Coleoptera: Scarabaeidae)
Figure 4. Associations between three biogeographical distance measures and genetic differentiation (FST), measured at three loci (CO1, ITS2 and H3), for populations of Xylotrupes siamensis. Mantel test statistics (r) indicate the strength and significance of correlations between the genetic distance and biogeographical distance. Distance calculations are detailed in the Material and Methods section. Least cost distances were subject to rescaling and are thus unitless.
Figure 2. A in Isolation by geographical distance after release from Pleistocene refugia explains genetic and phenotypic variation in Xylotrupes siamensis (Coleoptera: Scarabaeidae)
Figure 2. A, the sampling sites of Xylotrupes siamensis populations in this study. White circles indicate samples of the Tonkinensis form and grey circles the Siamensis form. The Mekong River is indicated using a thick grey line; elevational differences are shown via a coloured scale, where a lighter colour depicts higher elevation (maximum = 4000 m a.s.l.). B, location of the study area within the Asia–Pacific region. C–E, species distribution model predictions based on the Last Interglacial (C), the Last Glacial Maximum (D) and current climatic conditions (E) are shown, where darker blue indicates higher predicted climatic suitability.
On the predictability of phenotypic divergence in geographic isolation
<p><span>Do related populations that are separated by barriers predictably evolve differences from one another over time, or is such divergence idiosyncratic and unpredictable? We test these </span><span>alternatives by investigating patterns of trait evolution for 54 sister pairs of Andean forest birds that live in similar environments on either side of the arid Marañón Gap, a strong dispersal barrier for humid montane species. We measured divergence in both sexual (song and plumage) and ecological (beak size and beak shape) traits. Sexual traits evolve in a clock-like fashion, with trait divergence positively correlated with genetic distance (r = 0.6 to 0.7). In contrast, divergence in ecological traits is uncorrelated or only loosely correlated with genetic distance (r = 0.0 to 0.3). Thus, for geographically isolated Andean montane forest birds that live in similar environments, divergence is predictable in sexual traits, but not for ecological traits. This means that sexual trait divergence occurs independently of adaptive ecological divergence within the mega-diverse tropical Andean avifauna. Last, we show that variation in genetic divergence across a biogeographic barrier is associated</span><span> with traits that are proxies for species' opportunities for dispersal (low elevation limit and elevational niche breadth), but not with traits that are proxies for species' dispersal abilities (hand-wing index and foraging strata).</span></p>
Data from: Geographical isolation and environmental heterogeneity contribute to the spatial genetic patterns of Quercus kerrii (Fagaceae)
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Data from: Genome-wide differentiation in closely related populations: the roles of selection and geographic isolation
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Data from: Evolution of life history traits in geographically isolated populations of Vaejovis scorpions (Scorpiones: Vaejovidae)
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Data from: Disentangling the effects of geographic and ecological isolation on genetic differentiation
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Data from: Geographic isolation and larval dispersal shape seascape genetic patterns differently according to spatial scale
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Data from: Genomic signatures of geographic isolation and natural selection in coral reef fishes
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Data from: Electrophoretic mobility confirms reassortment bias among geographic isolates of segmented RNA phages
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Data from: Unexpected absence of genetic separation of a highly diverse population of hookworms from geographically isolated hosts
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Data from: Phylogenetic diversity of two geographically overlapping species in the lichen genus Sticta (Ascomycota: Peltigeraceae): Isolation by distance, environment, or fragmentation?
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Data from: Examining the full effects of landscape heterogeneity on spatial genetic variation: a multiple matrix regression approach for quantifying geographic and ecological isolation
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Genomic variation in the American pika: signatures of geographic isolation and implications for conservation
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Data from: The tempo of trait divergence in geographic isolation: avian speciation across the Marañon valley of Peru
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Data from: Phylogeography of a widespread lizard complex reflects patterns of both geographic and ecological isolation
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Data from: Phylogeography, genetic structure and population divergence time of cheetahs in Africa and Asia: evidence for long-term geographic isolates
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Isolation by geographical distance after release from Pleistocene refugia explains genetic and phenotypic variation in Xylotrupes siamensis (Coleoptera: Scarabaeidae)
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On the predictability of phenotypic divergence in geographic isolation
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