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Reproductive Allocation and Size Constraints in the Cladoceran Simocephalus vetulus (Muller)

N. Perrin
Functional Ecology
Vol. 3, No. 3 (1989), pp. 279-283
DOI: 10.2307/2389366
Stable URL: http://www.jstor.org/stable/2389366
Page Count: 5
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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.
Reproductive Allocation and Size Constraints in the Cladoceran Simocephalus vetulus (Muller)
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Abstract

Like many organisms, the cladoceran Simocephalus vetulus (Muller) continues to grow when reproducing, whereas the optimal strategy is to stop growing at maturity, and to invest all available production into reproduction thereafter. It has been proposed that a size constraint is responsible for the observed strategy (Perrin, Ruedi & Saiah, 1987), by preventing organisms from investing more than a given amount of energy into reproduction. This hypothesis is developed here and the two following predictions are derived: (1) the onset of reproduction should be independent of age and (2) the reproductive investment should be size-specific, thus independent of the production rate. Both predictions are tested by rearing a clone of S. vetulus in a gradient of productivity. The results support the first prediction, but not the second one, so that the size-constraint hypothesis is disproved.

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