SEASONAL VARIATION IN SEX RATIO OF FLEDGLING AMERICAN KESTRELS: A LONG TERM STUDY

MATTEO GRIGGIO; FRANCES HAMERSTROM; ROBERT N. ROSENFIELD; GIACOMO TAVECCHIA

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SEASONAL VARIATION IN SEX RATIO OF FLEDGLING AMERICAN KESTRELS: A LONG TERM STUDY

机译：刚出生的美国鸟的性别比的季节变化：长期研究

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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.

机译：早鸟假说预测，在繁殖季节的较早繁殖的雄性比在较晚繁殖的雄性具有优势。我们通过检查1968年至1997年间在威斯康星州巢箱中繁殖的265个美国凯斯特雷尔（Falco sparverius）育雏的1,025只雏鸟的性别比，对这一假设进行了检验。我们发现性别比的季节变化是：雏鸟的性别比在繁殖季节的早期对雄性有偏见，但随着季节的发展，对雌性的偏见也越来越大。我们的结果为“早起的鸟类假说”提供了支持，并表明该趋势的陡峭性可能随着纬度的增加而降低。

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来源
《The Wilson Bulletin》 |2002年第4期|p.474-478|共5页
作者
MATTEO GRIGGIO; FRANCES HAMERSTROM; ROBERT N. ROSENFIELD; GIACOMO TAVECCHIA;
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Dept. of Biology, Univ. of Padova, via U. Bassi 51/B, I-35131 Padova, Italy;

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正文语种 eng
中图分类鸟纲;
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SEASONAL VARIATION IN SEX RATIO OF FLEDGLING AMERICAN KESTRELS: A LONG TERM STUDY

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