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Variation in size at sex-change among natural populations of the protandrous hermaphrodite, Crepidula fornicata (Gastropoda, Calyptraeidae)

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Abstract

Protandrous hermaphrodites are predicted to change sex from male to female when relative reproductive fitness of females surpasses that of males. How size at sex transition varies with population, mating group and individual parameters was investigated for five populations of the protandrous hermaphrodite slipper snail, Crepidula fornicata. The populations varied for density, size distribution, average mating group size and sex ratio. Size at sex-change was correlated with the population sex ratio. Comparisons of multiple hypotheses revealed that variables predicting the sex of a snail vary among positions in the mating group. The variables included body size, the relative size of the snail sitting atop the focal snail and population density. Our data support the conclusions that size at sex-change (and by inference, the size at which one sex has relatively greater fitness) is not fixed for these hermaphrodites and that individual size, social conditions and population differences all influence variation in relative fitness.

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Acknowledgments

The authors thank Jeffrey S. Levinton and Joel Trexler for advice and support over the course of this project. Jeff Levinton, Steve Munch, Jim Rohlf and Joseph Parkos provided advice concerning the statistical analysis of the data. AC was supported by a National Science Foundation Graduate Research Fellowship. Contribution 1206 from Ecology and Evolution at Stony Brook University. The manuscript was improved by comments from anonymous reviewers and the journal editorial staff.

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Correspondence to J. Matthew Hoch.

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Communicated by S. Connell.

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Hoch, J.M., Cahill, A.E. Variation in size at sex-change among natural populations of the protandrous hermaphrodite, Crepidula fornicata (Gastropoda, Calyptraeidae). Mar Biol 159, 897–905 (2012). https://doi.org/10.1007/s00227-011-1867-4

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  • DOI: https://doi.org/10.1007/s00227-011-1867-4

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