期刊
AUK
卷 130, 期 1, 页码 171-179出版社
OXFORD UNIV PRESS INC
DOI: 10.1525/auk.2012.12016
关键词
breeding strategies; Canada Goose; capital-income continuum; carbon-13; endogenous and exogenous nutrients; egg formation; Lesser Snow Goose; life history strategies
类别
资金
- Ontario Ministry of Natural Resources Wildlife Research and Development Section
- Arctic Goose Joint Venture
- Trent University
- Indian and Northern Affairs Canada
Understanding factors that determine sources of nutrients for reproduction is vital to interpreting different life-history strategies used among species, within species, and among taxa. We used stable carbon isotope analysis (delta C-13) to compare the relative use of endogenous and exogenous nutrients during egg synthesis between two species of geese, Canada Geese (Branta canadensis interior) and Lesser Snow Geese (Chen caerulescens caerulescens), nesting on Akimiski Island, Nunavut. We estimated that Canada Geese used 49 +/- 1.1% (SE), 61 +/- 1.3%, and 51 +/- 1.1% endogenous nutrients for albumen, yolk protein, and yolk lipid, respectively. Lesser Snow Geese used significantly less endogenous nutrients during clutch formation, allocating only 25 +/- 1.2%, 36 +/- 1.5%, and 34 +/- 1.7% endogenous nutrients for albumen, yolk protein, and yolk lipid, respectively. Although the proportion of endogenous nutrients allocated to eggs did not vary by year in Canada Geese, proportions varied significantly among years in Snow Geese. We discuss how access to exogenous nutrients appears to be an important factor in determining nutrient allocation strategies during egg production in geese and conclude that, although body size is likely an important ultimate factor in determining overall breeding strategies in birds, proximate factors that influence access to nutrients during egg production appear to be more important in shaping nutrient allocation to egg synthesis. Thus, interactions between physiological and morphological constraints and local environmental conditions can promote the use of flexible strategies in animals that migrate to breed. Received 5 February 2012, accepted 5 September 2012.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据