Life history trade-offs and response to selection on egg size in the polychaete worm Hydroides elegans |
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Authors: | Cecelia M Miles Marta L Wayne |
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Institution: | (1) Department of Ecology and Evolution, University of Chicago, 1101 E. 57 St., Chicago, IL 60637, USA;(2) Department of Zoology, University of Florida, 223 Bartram Hall, Gainesville, FL 32611, USA |
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Abstract: | In order to examine the genetic relationships among life-history traits in a hermaphroditic species we used artificial selection
for increased egg size and measured correlated responses across the life cycle of the serpulid polychaete Hydroides elegans, a protandrous sequential hermaphrodite. We recorded sex ratios across generations, and measured egg size, egg energy, larval
volume at two time points, juvenile tube length, adult dry weight and fecundity after selection. Selection for larger eggs
produced positive correlated responses in egg energy, fecundity and larval size at competence. Selection for increased egg
size was also manifested by earlier sex change and this resulted in selected individuals spending less time as males relative
to controls. We propose that egg size is negatively correlated with duration of andromorphy, that is, that female fitness
trades off with male fitness. |
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Keywords: | Artificial selection Correlated response Life-history evolution Hermaphrodite Trade-off |
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