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Control of Fecundity in Pieris rapae: I. The Problem
Journal of Animal Ecology
Vol. 53, No. 2 (Jun., 1984), pp. 581-588
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/4536
Page Count: 8
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(1) Pupal weight measures potential lifetime fecundity. (2) Larger individuals lay on average 20% more eggs than small ones. There is constant natural selection for greater size. (3) Larger individuals survive rather better than smaller ones at every stage of the life cycle. The advantage of greater size and fecundity, is not counteracted by reduced survival. (4) There is genetic variation for pupal weight which, in the laboratory, responds immediately and repeatedly to artificial selection for larger pupae. There is no such response to the natural selection in the field.
Journal of Animal Ecology © 1984 British Ecological Society