Oct 3, 2009

Peripatric speciation drives diversification and distributional pattern of reef hermit crabs (Decapoda: Diogenidae: Calcinus)

Evolution; International Journal of Organic Evolution
Maria Celia Machel D Malay, Gustav Paulay

Abstract

The diversity on coral reefs has long captivated observers. We examine the mechanisms of speciation, role of ecology in speciation, and patterns of species distribution in a typical reef-associated clade-the diverse and colorful Calcinus hermit crabs-to address the origin of tropical marine diversity. We sequenced COI, 16S, and H3 gene regions for approximately 90% of 56 putative species, including nine undescribed, "cryptic" taxa, and mapped their distributions. Speciation in Calcinus is largely peripatric at remote locations. Allopatric species pairs are younger than sympatric ones, and molecular clock analyses suggest that >2 million years are needed for secondary sympatry. Substantial niche conservatism is evident within clades, as well as a few major ecological shifts between sister species. Color patterns follow species boundaries and evolve rapidly, suggesting a role in species recognition. Most species prefer and several are restricted to oceanic areas, suggesting great dispersal abilities and giving rise to an ocean-centric diversity pattern. Calcinus diversity patterns are atypical in that the diversity peaks in the west-central oceanic Pacific rather than in the Indo-Malayan "diversity center." Calcinus speciation pa...Continue Reading

  • References28
  • Citations32

References

  • References28
  • Citations32

Citations

Mentioned in this Paper

Cytochrome c Oxidase Subunit VIa
CFC1 gene
DNA, Mitochondrial
Indonesia Zebrafish
Tropical Climate
Decapoda (Crustacea)
Calcinus
Phylogeny
Anomura
Diogenidae

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