Sex-specific life-history trait expression in hybrids of a cave- and surface-dwelling fish (Poecilia mexicana, Poecilidae)

作     者：Rüdiger Riesch Luis R.Arriaga Ingo Schlupp 

作者机构：Department of Biological SciencesRoyal Holloway University of LondonEghamTW20 OEXUK CEFECNRSUnivMontpellierEPHEIRDMontpellierFrance Department of BiologyUniversity of OklahomaNormanOK 73019USA 

出 版 物：《Current Zoology》 (动物学报（英文版）)

年 卷 期：2024年第70卷第4期

页      面：421-429页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 071002[理学-动物学] 

基　　金：supported by the National Science Foundation of America(DEB-0743406) the OU VP for Research Faculty Investment Program 

主　　题：dominance life-history evolution local adaptation postzygotic isolation selection against hybrids. 

摘      要：Evaluating the fitness of hybrids can provide important insights into genetic differences between species or diverging *** focused on surface-and cave-ecotypes of the widespread Atlantic molly Poecilia mexicana and raised F1 hybrids of reciprocal crosses to sexual maturity in a common-garden *** were reared in a fully factorial 2 x 2 design consisting of lighting(light ***)and resource availability(high *** food).We quantified survival,ability to realize their full reproductive potential(i.e.,completed maturation for males and 3 consecutive births for females)and essential life-history *** to the performance of pure cave and surface fish from a previous experiment,F1s had the highest death rate and the lowest proportion of fish that reached their full reproductive *** also uncovered an intriguing pattern of sex-specific phenotype expression,because male hybrids expressed cave molly life histories,while female hybrids expressed surface molly life *** results provide evidence for strong selection against hybrids in the cave molly system,but also sug-gest a complex pattern of sex-specific(opposing)dominance,with certain surface molly genes being dominant in female hybrids and certain cavemollygenes beingdominant in malehybrids.