The adaptive significance of eggshell removal by nesting birds: testing the egg-capping hypothesis
Article Abstract:
The result of a study which pointed out that the cost to hatchability of egg-capping was a factor in the selection for eggshell removal in many bird species was tested in American Coots (Fulica americana). No significant difference in hatching success was detected between capped and uncapped eggs, indicating that egg-capping is not so deleterious to American Coots. However, it was mentioned that the statistical sample was not big enough to justify rejection of the egg-capping hypothesis, and further studies using more common species such as chicken or Japanese quail are suggested.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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Factors affecting renesting in American Coots
Article Abstract:
The effects of habitat conditions, food availabilty, nest loss and investments in egg formation on renesting in American Coots was examined between 1987 and 1991. Coots replaced 68% of 281 clutches which had been destroyed. Annual and seasonal variations were observed in renesting rates, but renesting, clutch size and egg size were not affected by previous investments in egg formation or incubation. Time and habitat quality, but not food or nutrient reserves, were found to be important constraints to renesting.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1993
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The adaptive significance of nutrient reserves to breeding American coots: a reassessment
Article Abstract:
A study was conducted to determine if stored fat, protein and ash reserves have a role to play in the reproductive behavior of American coots. Results showed no change in mean reserve levels for females across prelaying, laying, incubation, early brood-rearing and late brood-rearing stages. However, fat reserves doubled for males from early to late brood-rearing. It is suggested that the availability of endogenous nutrients does not influence reproduction in American coots.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1997
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