Abstract
The distribution of breeding resources, such as nest sites, can have a pronounced impact on a population by affecting the proportion of individuals that succeed to breed and hence, the variation in reproductive success. Aggregation of important resources can lead to resource monopolisation by a limited number of individuals and thus affect the intensity of sexual selection. In this study, we tested, by contrasting two experimental treatments (dispersed vs. aggregated), how nest distribution affects: (1) mating behaviour, (2) male nest occupation and mating success, and (3) reproductive success and the opportunity for selection. We used the two-spotted goby (Gobiusculus flavescens), a small marine fish with a resource-based mating system, as our model species. When nests were aggregated, a larger proportion of the males behaved aggressively, fewer males succeeded in occupying a nest, fewer males became mated, and those males that mated received fewer eggs from spawning females. These effects resulted in a higher variance in reproductive success and hence, a higher opportunity for selection (I rs ), in the aggregated treatment. We suggest that the results are a direct consequence of males defending a territory around their nest, preventing competitively inferior males from breeding. However, we found no significant selection differentials for body length or condition of males in either treatment. Our results support the hypothesis that aggregation of essential resources like nests promotes resource monopolisation. In species facing highly clumped nesting resources in the wild, monopolisation may negatively impact population productivity but could lead to strong selection on traits that promote male competitive ability.
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Acknowledgments
We are grateful to Erlend Grandbo Rolseth for assisting with the experiment and to Katja Heubel, Carin Magnhagen, Ralph Dobler, Ola Svensson, Marcela Gonzalez, Lori Englebert, Dennis Sprenger, the Journal Club of the Animal Evolutionary Ecology at Tübingen University, Joachim Frommen, Franziska Schädelin and one anonymous reviewer for constructive comments on the manuscript. We thank the Sven Lovén Centre of Marine Sciences at Kristineberg for use of their facilities, technical support and hospitality. The study was financially supported by the Royal Swedish Academy of Science and the EU ASSEMBLE mobility programme.
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The study was conducted in accordance with Swedish laws on animal research and under license from The Swedish Board for Research on Animals.
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Mück, I., Wacker, S., Myhre, L.C. et al. Nest distribution affects behaviour and mating success in a marine fish. Behav Ecol Sociobiol 67, 609–619 (2013). https://doi.org/10.1007/s00265-013-1480-2
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DOI: https://doi.org/10.1007/s00265-013-1480-2