期刊
AUK
卷 126, 期 4, 页码 831-838出版社
AMER ORNITHOLOGISTS UNION
DOI: 10.1525/auk.2009.08197
关键词
American Coot; carotenoids; egg size; Fulica americana; laying sequence; stable isotopes; supplemental feeding
类别
资金
- Natural Sciences and Engineering Council of Canada
- Stuart and Mary Houston Professorship in Ornithology
- Scottish Executive Rural Affairs Department
- Canadian Aboriginal Science and Technology Society
- RBC Financial Group
- TD Financial Group
- First Nations Bank of Canada
- BP Canada
- Warner/Lambert Fund
- University of Saskatchewan
Food-supplementation studies on birds during egg laying have generally manipulated macronutrients and energy. Such studies have shown variable effects on egg size in American Coots (Fulica americana). We determined the relative influences of local environment, food quantity, and food quality on egg size in American Coots by supplementing food and carotenoids at three sites in Saskatchewan. Eggs were collected and analyzed for carotenoid content and stable isotopes (delta N-15 and delta C-13) in the yolk to determine whether variation in the type of food eaten contributes to egg size. We also report on the isotopic analysis of American Coot tissues and their eggs to assess evidence of endogenous versus exogenous protein and lipid allocations to reproduction. We provide isotopic evidence that American Coots used endogenous lipid, but not protein, reserves for egg formation and that egg size is more dependent oil exogenous sources of nutrients. Laying sequence was the only variable across nesting locales that had a significant influence on the size of eggs. There was an effect of provisioning food at only one site; however, this response was driven by a component of diet quality other than carotenoids. Yolk delta C-13 values were positively correlated with egg volume, which further suggests the importance of diet quality in determining egg size in American Coots. Received 6 October 2008, accepted 28 April 2009.
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