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Sexual size monomorphism may evolve in lizards with a body size maximizing reproductive performance for both sexes

Current Zoology 2023年第3期69卷 277-283页

作者： Hong-Liang Lu Jian-Fang Gao Kun Guo Xiang Ji Hangzhou Key Laboratory for Ecosystem Protection and Restoration School of Life and Environmental SciencesHangzhou Normal UniversityHangzhou 311121ZhejiangChina Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection College of Life and Environmental SciencesWenzhou UniversityWenzhou 325035ZhejiangChina

We used Takydromus septentrionalis,a sexually size-monomorphic lacertid lizard,as a model system to test the hypothesis that sexual size monomorphism may evolve in lizards where reproductive performance is maximized at a similar body size for both *** allowed lizards housed in laboratory enclosures to lay as many clutches(for females)as they could or to mate as many times(for males)as they could in a breeding ***-assortative mating was weak but evident in ***,as revealed by the fact that male and female snout–vent lengths(SVLs)in mating pairs were significantly and positively *** frequency(indicative of male reproductive performance)varied from 1 to 8 per breeding season,generally increasing as SVL increased in adult males smaller than 67.4 mm *** frequency varied from 1 to 7 per breeding season,with female reproductive performance(determined by clutch frequency,annual fecundity,and annual reproductive output)maximized in females with a SVL of 68.0 *** to our hypothesis,the reproductive performance was maximized in the intermediate sized rather than the largest individuals in both sexes,and the body size maximizing reproductive performance was similar for both *** work could usefully investigate other lineages of lizards with sexually monomorphic species in a phylogenetic context to corroborate the hypothesis of this study.

关键词： annual fecundity annual reproductive output clutch frequency mating frequency Takydromus septentrionalis

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