Fitting fertilisation kinetics models for free-spawning marine invertebrates |
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Authors: | C. A. Styan A. J. Butler |
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Affiliation: | (1) Department of Zoology, University of Adelaide, Adeliade, South Australia 5005, Australia, AU |
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Abstract: | To determine how fertilisation varied with sperm concentration for two species of scallop, Chlamys (Equichlamys) bifrons (Lamarck) and C. asperrima (Lamarck), we performed a simple series of sperm dilution experiments, and measured egg size and sperm swimming speeds. C. bifrons eggs were much larger (average diam=116.5 μm), and sperm swimming speeds faster (209.8 μm s−1), than C. asperrima (71.2 μm, 166.0 μm s−1). In both species, maximum fertilisation occurred at an ambient sperm concentration of around 100 sperm μl−1; the maximum proportion of eggs fertilised was less than 0.70 in the C. bifrons experiments, but nearer 1.0 with C. asperrima. At high sperm concentrations (>100 sperm μl−1), fertilisation decreased (presumably due to polyspermy) with increasing sperm concentration, but decreased more rapidly in C. bifrons than C. asperrima. A polyspermy-adjusted fertilisation kinetics model could be fitted to the experimental data, but unique parameter estimates could not be determined. Received: 7 October 1999 / Accepted: 8 July 2000 |
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