The complexities of female mate choice and male polymorphisms： Elucidating the role of genetics, age, and mate-choice copying  

作　　者：Kasey D. FOWLER-FINN Laura SULLIVAN-BECKERS Amy M. RUNCK Eileen A. HEBETS 

机构地区：[1]School of Biological Sciences, University of Nebraska, Lincoln, NE 68508, USA

出　　处：《Current Zoology》2015年第6期1015-1035,共21页动物学报（英文版）

摘　　要：Genetic, life history, and environmental factors dictate patterns of variation in sexual traits within and across popula- tions, and thus the action and outcome of sexual selection. This study explores patterns of inheritance, diet, age, and mate-choice copying on the expression of male sexual signals and associated female mate choice in a phenotypically diverse group of Schizo- cosa wolf spiders. Focal spiders exhibit one of two male phenotypes： ＇omamented＇ males possess large black brushes on their fo- relegs, and ＇non-ornamented＇ males possess no brushes. Using a quantitative genetics breeding design in a mixed population of ornamented/non-ornamented males, we found a strong genetic basis to male phenotype and female choice. We also found that some ornamented males produced some sons with large brushes and others with barely visible brushes. Results of diet manipula- tions and behavioral mating trials showed no influence of diet on male phenotype or female mate choice. Age post maturation, however, influenced mate choice, with younger females being more likely to mate with ornamented males. A mate-choice copy- ing experiment found that, following observations of another female＇s mate choice/copulation, virgin mature females tended to match the mate choice （ornamented vs. non-ornamented males） of the females they observed. Finally, analyses of genetic varia- tion across phenotypically pure （only one male phenotype present） vs. mixed （both phenotypes present） populations revealed ge- netic distinction between phenotypes in phenotypically-pure populations, but no distinctionin phenotypically-mixed populations. The difference in patterns of genetic differentiation and mating across geographic locations suggests a complex network of fac- tors contributing to the outcome of sexual selection .

关 键 词：Male polymorphism Assortative mating SPECIATION HERITABILITY SCHIZOCOSA 

分 类 号：Q348[生物学—遗传学] Q346.5