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The Significance of Clutch-Size in the Partridge (Perdix perdix)

David Lack
Journal of Animal Ecology
Vol. 16, No. 1 (May, 1947), pp. 19-25
DOI: 10.2307/1503
Stable URL: http://www.jstor.org/stable/1503
Page Count: 7
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The Significance of Clutch-Size in the Partridge (Perdix perdix)
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Abstract

1. The first laying of the partridge (Perdix perdix) in England varies from 10 to 20 eggs, averaging 14.6. Late layings are smaller. 2. There are annual differences in the average size of first layings. 3. Average clutch-size is greater in northern and eastern Europe than in England. 4. Clutch-size is not limited by potential egg-production. 5. Hatching success is equal in clutches of between 8 and at least 20 eggs. 6. Clutch-size is considered to be selected through the food available for the brood and a method of proving this is suggested.

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