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Larger is not better: no mate preference by European common frog (Rana temporaria) males

In: Behaviour
Authors:
Carolin Dittrich Museum für Naturkunde Berlin, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany
Berlin–Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, Germany

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https://orcid.org/0000-0002-4447-4481
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Melanie Tietje Department of Biology, Aarhus University, Ny Munkegade 116, 8000 Aarhus C, Denmark

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https://orcid.org/0000-0003-1157-2963
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Mark-Oliver Rödel Museum für Naturkunde Berlin, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstraße 43, 10115 Berlin, Germany
Berlin–Brandenburg Institute of Advanced Biodiversity Research (BBIB), Berlin, Germany

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https://orcid.org/0000-0002-1666-195X
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Abstract

In explosive breeding frogs, high intrasexual competition between males leads to a sexual coercion ruled mating system, where males presumably evolved preferences for specific female traits. We tested these preferences in the European Common Frog by excluding intrasexual competition. We hypothesized that all males show preferences towards larger female body size, due to higher fecundity. Our results did not show any preference considering female body size, neither in the attempt to amplex a female nor during the formation of pairs. Additionally, we witnessed a high failure rate of male mating attempts, which hints at high mating costs and offers an explanation for the lack of preferences in males. Nonetheless, we observed a non-random mating pattern in successfully formed pairs, where in the absence of size dimorphism females were on average larger than males. This indicates a different mechanism for selection which is independent from male mating preference or scramble competition.

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