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Control of Fecundity in Pieris rapae: I. The Problem

N. Gilbert
Journal of Animal Ecology
Vol. 53, No. 2 (Jun., 1984), pp. 581-588
DOI: 10.2307/4536
Stable URL: http://www.jstor.org/stable/4536
Page Count: 8
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Control of Fecundity in Pieris rapae: I. The Problem
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Abstract

(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.

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