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

作　　者：Konrad Lipkowski Sophie Steigerwald Lisa M Schulte Carolin Sommer-Trembo Jonas Jourdan 

机构地区：[1]Department of Wildlife/Zoo-Animal-Biology and Systematics,Institute for Ecology,Evolution and Diversity Goethe University Frankfurt,Maxvon-Laue-Straße 13,Frankfurt am Main,D-60438,Germany [2]Department of Environmental Science,Stockholm University,Svante Arrheniusväg 8,Stockholm,SE-11418,Sweden [3]Zoological Institute,University of Basel,Vesalgasse 1,Basel,CH-4051,Switzerland [4]Department of Aquatic Ecotoxicology,Institute for Ecology,Evolution and Diversity,Goethe University Frankfurt am Main,Frankfurt am Main,Germany

出　　处：《Current Zoology》2022年第4期459-467,共9页动物学报（英文版）

摘　　要：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 populations 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 establishment 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 distinctive variation of choosiness in natural populations and highlights the importance of considering social background information in future behavioral studies.

关 键 词：AMPLEXUS CRUSTACEA local adaptation mate choice population density sex ratio 

分 类 号：Q95[生物学—动物学]