Genetic structuring among colonies of a pantropical seabird: Implication for subspecies validation and conservation

Ecology and Evolution
Laurence HumeauAudrey Jaeger

Abstract

Investigations of the genetic structure of populations over the entire range of a species yield valuable information about connectivity among populations. Seabirds are an intriguing taxon in this regard because they move extensively when not breeding, facilitating intermixing of populations, but breed consistently on the same isolated islands, restricting gene flow among populations. The degree of genetic structuring of populations varies extensively among seabird species but they have been understudied in their tropical ranges. Here, we address this across a broad spatial scale by using microsatellite and mitochondrial data to explore the population connectivity of 13 breeding populations representing the six subspecies of the white-tailed tropicbird (Phaethon lepturus) in the Atlantic, Indian, and Pacific Oceans. Our primary aim was to identify appropriate conservation units for this little known species. Three morphometric characters were also examined in the subspecies. We found a clear pattern of population structuring with four genetic groups. The most ancient and the most isolated group was in the northwestern Atlantic Ocean. The South Atlantic populations and South Mozambique Channel population on Europa were geneticall...Continue Reading

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Datasets Mentioned

BETA
MT073267
MT073268

Methods Mentioned

BETA
PCA
electrophoresis
genotyping
PCR

Software Mentioned

CLUMPAK
jModelTest
FigTree
GenAlEx
BEAST
MicroChecker
ARLEQUIN
R
GeneMapper
pegas package

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