Abstract
Despite growing evidence for plasticity in the mating patterns of nest-holding animals in relation to the changes in nest abundance, the effects of aggressive interaction by dominant males on nest availability for conspecific rivals remains unclear. To quantify the effects of male–male competition on nest-site choice and mating success of the male Japanese fluvial sculpin Cottus pollux, we conducted experiments on 5 males from different 5 size classes under both sufficient and shortage nest-abundance conditions. Nest-choice experiments showed that both male size class and nest-abundance condition had significant effects on the nesting rates of males. Following the nest-choice experiments, 10 gravid females were added in the experimental tanks. Mating experiments revealed that male size, nesting rate before addition of females, and the number of courtship attempts on females were valid variables of male mating success, regardless of nest-abundance conditions. After achieving initial mating success, the largest nesting male exhibited more frequent aggressive interaction with other conspecific males than he did before obtaining eggs in his nest. Our results suggest that size-mediated dominance and aggressive behavior of males may disrupt nest acquisition of other conspecific males, and may consequently result in extreme variation in mating success among males even under sufficient nest-abundance conditions.
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Acknowledgments
We sincerely thank Drs Y. Nagata, M. Hori, T. Narita, M. Kohda, K. Karino and S. Awata for their critical readings and advice on the early version of this manuscript; the Kodamas for providing fish farm ponds and a pleasant room during the experimental study; and T. Ito and Y. Shimizu for providing valuable information during the field survey. The experiments carried out in this study comply with the current laws in Japan.
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Natsumeda, T., Mori, S. & Yuma, M. Size-mediated dominance and aggressive behavior of male Japanese fluvial sculpin Cottus pollux (Pisces: Cottidae) reduce nest-site abundance and mating success of conspecific rivals. J Ethol 30, 239–245 (2012). https://doi.org/10.1007/s10164-011-0316-7
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DOI: https://doi.org/10.1007/s10164-011-0316-7