首页|Natural variation in social conditions affects male mate choosiness in the amphipod Gammarus roeselii

Natural variation in social conditions affects male mate choosiness in the amphipod Gammarus roeselii

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The extent of male mate choosiness is driven by a trade-off between various environmental factors associated with the costs of mate acquisition, quality assessment and opportunity costs. Our knowledge about natural variation in male mate choosiness across different pop-ulations of the same species, however, remains limited. In this study, we compared male mate choosiness across 10 natural populations of the freshwater amphipod Gammarus roeselii (Gervais 1835), a species with overall high male mating investments, and evaluated the relative influence of population density and sex ratio (both affecting mate availability) on male mate choosiness. We investigated amplexus estab-lishment after separating mating pairs and presenting focal males with a novel, size-matched female from the same population. Our analysis revealed considerable effects of sex ratio and (to a lesser extent) population density on time until amplexus establishment (choosiness). Male amphipods are able to perceive variable social conditions (e.g., sex ratio) and modify their mating strategy accordingly: We found choosiness to be reduced in increasingly male-biased populations, whereas selectivity increases when sex ratio becomes female biased. With this, our study expands our limited knowledge on natural variations in male mate choosiness and illustrates the importance of sex ratio (i.e., level of competition) for male mating decisions in natural environments. Accounting for variation in sex ratios, therefore, allows envisioning a dis-tinctive variation of choosiness in natural populations and highlights the importance of considering social background information in future behavioral studies.

amplexusCrustacealocal adaptationmate choicepopulation densitysex ratio

Konrad Lipkowski、Sophie Steigerwald、Lisa M Schulte、Carolin Sommer-Trembo、Jonas Jourdan

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Department of Wildlife/Zoo-Animal-Biology and Systematics,Institute for Ecology,Evolution and Diversity Goethe University Frankfurt,Max-von-Laue-Straße 13,Frankfurt am Main,D-60438,Germany

Department of Environmental Science,Stockholm University,Svante Arrheniusväg 8,Stockholm,SE-11418,Sweden

Zoological Institute,University of Basel,Vesalgasse 1,Basel,CH-4051,Switzerland

Department of Aquatic Ecotoxicology,Institute for Ecology,Evolution and Diversity,Goethe University Frankfurt am Main,Frankfurt am Main,Germany

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2022

动物学报(英文版)
中国科学院动物研究所,中国动物学会

动物学报(英文版)

CSCDSCI
影响因子：0.198
ISSN：1674-5507
年,卷(期)：2022.68(4)
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