Molecular provenance analysis for shy and white-capped albatrosses killed by fisheries interactions in Australia, New Zealand, and South Africa
Date
2006
Authors
Abbott, Cathryn
Double, Michael
Gales, Rosemary
Baker, G. Barry
Lashko, Anna
Robertson, Christopher J R
Ryan, Peter G
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Publisher
Kluwer Academic Publishers
Abstract
Shy and white-capped albatrosses, Thalassarche cauta and T. steadi, respectively, are phenotypically similar and are known to suffer fisheries-related bycatch mortality across their foraging range. Assessments of the extent or scale of impact of bycatch mortality on these species have previously been precluded by difficulties identifying bycatch carcasses to species level. In this study, a fast and simple molecular test based on a single nucleotide polymorphism in mtDNA of shy and white-capped albatrosses was used to determine the species composition of fisheries bycatch carcasses recovered from Australian, New Zealand, and South African waters. The only area where bycatch mortality of both species co-occurred was in Tasmanian waters; in all other zones the bycatch was exclusively comprised of white-capped albatrosses. Genotypic provenance assignment tests of shy albatrosses, a species with significant genetic structure between island colonies, correctly assigned 72% to their island of origin. These data are the first to provide insight into the relative vulnerability of shy and white-capped albatrosses to bycatch mortality across their foraging range, and to establish the vast differences in the at-sea distributions of these two species.
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Keywords
Keywords: bycatch; coexistence; community composition; DNA; molecular analysis; mortality; polymorphism; seabird; Africa; Australasia; Australia; New Zealand; South Africa; Southern Africa; Sub-Saharan Africa; Tasmania; Diomedeidae; Thalassarche cauta Assignment test; Fisheries seabird bycatch; Molecular species identification; Shy and white-capped albatrosses
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Source
Conservation Genetics
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Journal article
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2037-12-31
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