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Brand: The Gale Group Format: HTML Label: Wilson Ornithological Society Manufacturer: Wilson Ornithological Society Publication Date: December 01, 2002 Publisher: Wilson Ornithological Society Release Date: July 31, 2005 Studio: Wilson Ornithological Society Browse for similar items by category: Click to Display Editorial Review: Product Description: This digital document is an article from Wilson Bulletin, published by Wilson Ornithological Society on December 1, 2002. The length of the article is 2830 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser. From the author: The Early Bird Hypothesis predicts that males fledged early in the breeding season have an advantage over their later-fledged counterparts during competition for breeding sites. We tested this hypothesis by examining the sex ratio of 1,025 fledglings from 265 broods of American Kestrels (Falco sparverius) breeding in nest boxes in Wisconsin during the period 1968--1997. We found a seasonal shift in the sex ratio: the sex ratio of fledglings was biased toward males early in the breeding season, but became increasingly biased toward females as the season progressed. Our results provide support for the Early Bird Hypothesis and suggest that the steepness of this trend may decrease with increasing latitude. Citation Details Title: Seasonal variation in sex ratio of fledgling American Kestrels: a long term study.(Author Abstract) Author: Matteo Griggio Publication: Wilson Bulletin (Refereed) Date: December 1, 2002 Publisher: Wilson Ornithological Society Volume: 114 Issue: 4 Page: 474(5) Article Type: Author Abstract Distributed by Thomson Gale 
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