Abstract
Nesting males of Asterropteryx semipunctata conducted spawning behavior with 2–6 females simultaneously. We carried out field observations on a rocky reef in Kagoshima, Japan, to examine the hypotheses that large males will show multi-female spawning behavior because of their mating advantage, and that simultaneous multi-female spawning will occur when the operational sex ratio (OSR; the ratio of receptive males to receptive females) becomes female-biased. Contrary to our prediction, neither the total number of multi-female spawnings during a spawning season nor mean number of spawning females at a time were correlated with nesting male sizes. This indicates that larger males often did not conduct multi-female spawnings. As predicted, the incidence of multi-female spawning followed the change in the OSR over time—as the OSR in the study area became biased toward females, the incidence of multi-female spawnings gradually increased. Our results suggest that mate availability affects mating patterns in A. semipunctata.
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Acknowledgments
We are grateful to H. Suzuki, T. Kobari, and other members of Laboratory of Marine Biology, Kagoshima University, for their advice and encouragement during the study. We also thank two anonymous reviewers for their helpful suggestions and comments on the manuscript. G.N. Nishihara helped to correct the English.
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Hagiwara, K., Manabe, H. & Shinomiya, A. Simultaneous polygyny of the gobiid fish Asterropteryx semipunctata in relation to mate availability. J Ethol 28, 251–256 (2010). https://doi.org/10.1007/s10164-009-0178-4
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DOI: https://doi.org/10.1007/s10164-009-0178-4