Translator Disclaimer
1 January 2010 Fueling Incubation: Differential use of Body Stores in Arcticand Temperate-Breeding Barnacle Geese (Branta leucopsis)
Author Affiliations +
Abstract

We compared the use of body stores in breeding Barnacle Geese (Branta leucopsis) in traditional Arctic colonies in the Barents Sea with that in recently established temperate-zone breeding colonies in the Baltic Sea and North Sea by studying female body-mass loss and use of fat and protein stores during incubation. Average daily body-mass loss was almost identical in the 2 temperatebreeding populations (17.0 g and 16.5 g in Baltic Sea and North Sea, respectively), whereas Arctic-breeding females lost significantly less (10.6 g day-1). Temperate-breeding females initiated incubation with body mass 125 g higher than that of Arctic breeders, but at the end of incubation, body mass was similar among the 3 populations, averaging 1,458 g. Body-mass loss during incubation amounted to 23% (North Sea), 22% (Baltic Sea), and 15% (Barents Sea). Fat mass, as measured by isotope dilution in a subsample of females, was consistently higher in North Sea than in Barents Sea birds, but both populations showed similar rates of fat-mass loss (9.4 g day-1, on average). By contrast, loss of fat-free mass (assumed to represent wet protein) amounted to 9.3 g day-1 in North Sea birds but only 1.5 g day-1 in Barents Sea birds. Energy content of 1 g utilized body mass was 21.1 kJ (North Sea) and 34.9 kJ (Barents Sea), which equates to 376 kJ day-1 and 415 kJ day-1 drawn from stored energy, respectively. We suggest that differences in nest-attendance and postincubation demands are responsible for the differential use of body stores in temperate- and Arctic-breeding Barnacle Geese.

© 2010 by The American Ornithologists' Union. All rights reserved. Please direct all requests for permission to photocopy or reproduce article content through the University of California Press's Rights and Permissions website, http://www.ucpressjournals.com/reprintInfoasp.
Götz Eichhorn, Henk P. Van Der Jeugd, Harro A. J. Meijer, and Rudolf H. Drent "Fueling Incubation: Differential use of Body Stores in Arcticand Temperate-Breeding Barnacle Geese (Branta leucopsis)," The Auk 127(1), (1 January 2010). https://doi.org/10.1525/auk.2009.09057
Received: 1 November 2008; Accepted: 1 August 2009; Published: 1 January 2010
JOURNAL ARTICLE
11 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top