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Reproductive Rates in the Great Tit

C. M. Perrins and D. Moss
Journal of Animal Ecology
Vol. 44, No. 3 (Oct., 1975), pp. 695-706
DOI: 10.2307/3712
Stable URL: http://www.jstor.org/stable/3712
Page Count: 12
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Reproductive Rates in the Great Tit
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Abstract

(1) The problems encountered in comparing survival rates in relation to brood or litter size are discussed. (2) Data from thirteen years of a study of the great tit near Oxford were analysed. Other factors, as well as brood size, which affect survival were taken into account. (3) A most productive brood size was calculated for each year and compared with the observed mean brood sizes. In six years the most productive brood size was much greater than that observed, in one year it was less, and in the other six years the two were reasonably close. (4) Several factors tending to reduce the most productive brood size, which were not included in the analysis, are discussed.

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