Genetic differentiation within a widespread "supertramp" taxon: Molecular phylogenetics of the Louisiade White-eye (Zosterops griseotinctus).
"Supertramp" species are highly specialized overwater dispersers, and are useful taxa for investigating the influence of dispersal ability on speciation and diversification in island settings. The Louisiade White-eye (Zosterops griseotinctus) is a widespread avian supertramp endemic to Papua New Guinea's offshore islands. We used maximum likelihood and Bayesian inference to reconstruct phylogenetic relationships based on 2 mitochondrial and 1 nuclear loci (1813 bp total) from 88 individuals representing all 4 named subspecies and the full breadth of the species' range. We found significant geographic and population genetic structure, and support for a major clade containing the coral islets of the central Louisiade Archipelago and outlying Nissan Island. We found evidence of metapopulation structure and gene flow within the Louisiade Archipelago clade, and relatively high genetic distinctiveness of outlying island populations, including the population on volcanically-defaunated Long Island. We reject a hypothesis of panmixia within the Louisiade White-eye despite their long-range dispersal ability, and find evidence of selection against dispersal ability in populations on high-elevation islands where disturbance is rare. Our study represents a rare intraspecies phylogeny of an avian supertramp, and sheds light on patterns of evolution in highly vagile island species.
Department of Biology & Burke Museum of Natural History and Culture, University of Washington, Box 351800, Seattle, WA 98195, USA; Department of Biology, Reed College, 3203 S.E. Woodstock Blvd., Portland, OR 97202, USA. Electronic address: elinck@uw.edu.
Ethan
E
Linck
Department of Biology, Reed College, 3203 S.E. Woodstock Blvd., Portland, OR 97202, USA.
Sarah
S
Schaack
Department of Vertebrate Zoology and Anthropology and Center for Comparative Genomics, California Academy of Sciences, 55 Concourse Drive, Golden Gate Park, San Francisco, CA 94118, USA.
John P
JP
Dumbacher
D000818:Animals; D001499:Bayes Theorem; D002467:Cell Nucleus / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics; D019143:Evolution, Molecular; D051456:Gene Flow; D040961:Genetic Drift; D049810:Genetic Speciation; D010219:Papua New Guinea; D046109:Passeriformes / Q000145:classification / Q000235:genetics* / Q000502:physiology*; D010802:Phylogeny; D058974:Phylogeography
D004272:DNA, Mitochondrial
Aves; Dispersal; Island biogeography; Phylogeography; Systematics; Zosteropidae