Recent radiation of endemic Caribbean Drosophila of the dunni subgroup inferred from multilocus DNA sequence variation

Jason A Wilder, H. Hollocher

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Studies of island endemism provide a unique opportunity to elucidate fundamental mechanisms of speciation. Here we examine intra- and interspecific DNA sequence variation at four unlinked genetic loci among populations of the Drosophila dunni subgroup to provide a detailed genealogical portrait of the process of speciation among these island endemic species. Our data indicate two major rounds of diversification that have shaped the D. dunni subgroup. The first occurred 1.6-2.6 million years ago and separated three major lineages, one in Puerto Rico and the Virgin Islands, a second in the northern Lesser Antilles and Barbados, and a third in St. Vincent and Grenada. A second round of diversification occurred in the last 96,000 years in the northern Lesser Antilles and Barbados. The four distinct species that resulted from this recent round of diversification maintain relatively high amounts of genetic variation, similar to that of a closely related mainland species, and share extensive ancestral polymorphism. These data suggest a minimal role for population bottlenecks linked to founder events in the history of the D. dunni subgroup. Further, the recent divergence of these island populations highlights the extremely rapid development of reproductive isolation and distinct patterns of abdominal pigmentation that has occurred in these species.

Original languageEnglish (US)
Pages (from-to)2566-2579
Number of pages14
JournalEvolution
Volume57
Issue number11
StatePublished - Dec 2003
Externally publishedYes

Fingerprint

Islands
Drosophila
Barbados
Radiation
nucleotide sequences
DNA
indigenous species
Grenada
Virgin Islands
Puerto Rico
reproductive isolation
Reproductive Isolation
Population
pigmentation
population bottleneck
Genetic Loci
Pigmentation
endemism
endemic species
genetic polymorphism

Keywords

  • DNA sequence variation
  • Drosophila dunni subgroup
  • Island endemism
  • Phylogeography
  • Speciation

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)
  • Genetics(clinical)
  • Ecology
  • Genetics

Cite this

Recent radiation of endemic Caribbean Drosophila of the dunni subgroup inferred from multilocus DNA sequence variation. / Wilder, Jason A; Hollocher, H.

In: Evolution, Vol. 57, No. 11, 12.2003, p. 2566-2579.

Research output: Contribution to journalArticle

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