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The Effect of Food and Predation on Breeding Density and Success, Clutch Size and Laying Date of the Crow (Corvus corone L.)

Yoram Yom-Tov
Journal of Animal Ecology
Vol. 43, No. 2 (Jun., 1974), pp. 479-498
DOI: 10.2307/3378
Stable URL: http://www.jstor.org/stable/3378
Page Count: 20
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Effect of Food and Predation on Breeding Density and Success, Clutch Size and Laying Date of the Crow (Corvus corone L.)
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Abstract

(1) The role of food in determining breeding density and breeding success of crows was studied by experiments in which excess food was offered to territorial crows during the winter and the breeding season. It was found that excess of food (i) did not affect breeding density; (ii) improved chick survival; (iii) did not improve fledging weight; (iv) did not affect clutch size; and (v) affected date of breeding. (2) Evidence was given that the amount of food did not limit breeding success. (3) It is suggested that the distribution pattern of food is the ultimate factor which limits breeding success. The proximate factor is predation upon eggs and nestlings by intruding crows. When food is dispersed the nestlings are more vulnerable to predation, because the parents spent more time far away from the nest.

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