Title
Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments Differences in the timing and extent of annual moult of black-browed albatrosses Thalassarche melanophris living in contrasting environments
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
New York ,
Subject
Chemistry
Biology
Source (journal)
Polar biology. - New York
Volume/pages
36(2013) :6 , p. 837-842
ISSN
0722-4060
ISI
000318722600008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Moult entails costs related to the acquisition of energy and nutrients necessary for feather synthesis, as well as the impact of reduced flight performance induced by gaps in the wing plumage. Variation in moult strategies within and between populations may convey valuable information on energetic trade-offs and other responses to differing environmental constraints. We studied the moult strategies of two populations of a pelagic seabird, the black-browed albatross Thalassarche melanophris, nesting in contrasting environments. According to conventional wisdom, it is exceptional for albatrosses (Diomedeidae) to moult while breeding. Here we show that black-browed albatrosses breeding on the Falklands regularly moult primaries, tail and body feathers during chick-rearing, and the majority of those at South Georgia show some body feather moult in late chick-rearing. The greater moult-breeding overlap at the Falklands allows the birds to annually renew more primary feathers than their counterparts at South Georgia. The results of the present paper, pooled with other evidence, suggest that black-browed albatrosses from South Georgia face a more challenging environment during reproduction. They also serve to warn against the uncritical acceptance of conventional ideas about moult patterns when using feathers to study the ecology of seabirds and other migrants for which there is scant information at particular stages of the annual cycle.
E-info
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