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4 results for “sympatric color morphs”
Data from: Flickers of speciation? Sympatric color morphs of the arc-eye hawkfish, Paracirrhites arcatus, reveal key elements of divergence-with-gene-flow
One of the primary challenges of evolutionary research is to identify ecological factors that favor reproductive isolation. Therefore, studying partially isolated taxa has the potential to provide novel insight into the mechanisms of evolutionary divergence. Our study utilizes an adaptive color polymorphism in the arc-eye hawkfish (Paracirrhites arcatus) to explore the evolution of reproductive barriers in the absence of geographic isolation. Dark and light morphs are ecologically partitioned into basaltic and coral microhabitats a few meters apart. To test whether ecological barriers have reduced gene flow among dark and light phenotypes, we evaluated genetic variation at 30 microsatellite loci and a nuclear exon (Mc1r) associated with melanistic coloration. We report low, but significant microsatellite differentiation among color morphs and stronger divergence in the coding region of Mc1r indicating signatures of selection. Critically, we observed greater genetic divergence between color morphs on the same reefs than between the same morphs in different geographic locations. We hypothesize that adaptation to the contrasting microhabitats is overriding gene flow and is responsible for the partial reproductive isolation observed between sympatric color morphs. Combined with complementary studies of hawkfish ecology and behavior, these genetic results indicate an ecological barrier to gene flow initiated by habitat selection and enhanced by assortative mating. Hence the arc-eye hawkfish fulfill theoretical expectations for the earliest phase of speciation-with-gene-flow.
Data from: Recent speciation between sympatric Tanganyikan cichlid color morphs
Lake Tanganyika, Africa's oldest lake, harbors an impressive diversity of cichlid fishes. Although diversification in its radiating groups is thought to have been initially rapid, cichlids from Lake Tanganyika show little evidence for ongoing speciation. In contrast, examples of recent divergence among sympatric color morphs are well known in haplochromine cichlids from Lakes Malawi and Victoria. Here we report genetic evidence for recent divergence between two sympatric Tanganyikan cichlid color morphs. These Petrochromis morphs share mitochondrial haplotypes, yet microsatellite loci reveal that their sympatric populations form distinct genetic groups. Nuclear divergence between the two morphs is equivalent to that which arises geographically within one of the morphs over short distances, and is substantially smaller than that among other sympatric species in this genus. These patterns suggest that these morphs diverged only recently, yet that barriers to gene flow exist which prevent extensive admixture despite their sympatric distribution. The morphs studied here provide an unusual example of active diversification in Lake Tanganyika's generally ancient cichlid fauna and enable comparisons of speciation processes between Lake Tanganyika and other African lakes.
Data from: Flickers of speciation? Sympatric color morphs of the arc-eye hawkfish, Paracirrhites arcatus, reveal key elements of divergence-with-gene-flow
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Data from: Recent speciation between sympatric Tanganyikan cichlid color morphs
Open the record for dataset details and reuse information.
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