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Measuring the Cost of Reproduction. II. The Correlation Structure of the Life Tables of Five Freshwater Invertebrates

Graham Bell
Evolution
Vol. 38, No. 2 (Mar., 1984), pp. 314-326
DOI: 10.2307/2408490
Stable URL: http://www.jstor.org/stable/2408490
Page Count: 13
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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.
Measuring the Cost of Reproduction. II. The Correlation Structure of the Life Tables of Five Freshwater Invertebrates
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Abstract

Previous work on the rotifer Platyias patulus showed that the correlations between present reproduction and future reproduction or survival were zero or positive. This paper shows that the same conclusion holds for five other asexual freshwater invertebrates, reproducing in diverse ways: two oligochaetes which reproduce by paratomical fission, a bdelloid rotifer which produces a single large egg, and an ostracod and a cladoceran, which produce many small eggs. In almost all cases, individuals or clones with greater present reproduction have as great or greater an expectation of future reproduction. The bdelloid rotifer Philodina was an exception to this rule, these being a strong negative correlation between early fecundity and longevity for individuals within a clone. However, this is shown to be an outcome of determinate growth rather than an expression of reproductive cost. It is concluded that despite the negative correlation of present with future reproduction commonly observed when different species are compared correlations between individuals within species are generally positive.

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