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Sexual size dimorphism in lizards:Rensch’s rule,reproductive mode,clutch size,and line fitting method effects

Integrative Zoology 2022年第5期17卷 787-803页

作者： Tao LIANG Shai MEIRI Lei SHI College of Animal Science Xinjiang Agricultural UniversityUrumqiXinjiangChina College of Forestry Nanjing Forestry UniversityNanjingJiangsuChina School of Zoology&the Steinhardt Museum of Natural History Tel Aviv UniversityTel AvivIsrael

Rensch’s rule relates to a pattern whereby sexual size dimorphism is more female-biased in small-sized species and more male-biased in large-sized ones.We collected literature and museum data on the body size of males and females belonging to 4032 lizard species,as well as data on their reproductive modes and clutch sizes.We used phylogenetic comparative analyses,and general linear mixed models,to test Rensch’s rule and examined how re-productive mode and clutch size affect sexual size dimorphism.Sexual size dimorphism was independent of clutch size in lizard species with variable clutch sizes and in oviparous lizards.Large litters were associated with female-biased sexual dimorphism in viviparous and in scincomorph lizards.Inference regarding Rensch’s rule depended on the analytical method used to identify it.The widely used,but less conservative,reduced major axis regression usually support Rensch’s rule while ordinary least squares regressions mostly show isometric relationships.The rule tended to apply more to oviparous than to viviparous lizards.We infer that Rensch’s rule is,at best,a weak pattern in lizards.This is especially true in viviparous lineages where females reproduce infrequently and therefore evolve large sizes to maximise fecundity,resulting in female-biased dimorphism.

关键词： fecundity selection reduced major axis regression sexual selection sexual size dimorphism viviparity

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Pectoral Fin Fluctuating Asymmetry,Sexual Dimorphism and fecundity in the Crucians,Carassius auratus in Oujiang River,Zhejiang

Pectoral Fin Fluctuating Asymmetry,Sexual Dimorphism and Fec...

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浙江省第三届生物多样性保护与可持续发展研讨会

作者： Lei Huan-zong Lin Zhi-hua Fan Xiao-li Bao Zheng-hua Gao Bing-rang Hua He-liang (Department of Biology, School of Chemistry and Life Sciences, Lishui University, Zhejiang Lishui 323000, China)

We used crucians (Carassius auratus) collected from Oujiang River (Zhejiang, eastern China) to study pectoral fin asymmetry, sexual dimorphism and fecundity. The asymmetry of pectoral fin length and pectoral fin ray number meet the criteria of ideal fluctuating asymmetry in both sexes. There is no significant correlation between the indexes of pectoral fin length and pectoral fin ray number of females and males.

关键词： Crucian （Carassius auratus） Pectoral fins Fluctuating asymmetry Sexual dimorphism fecundity Sexual selection fecundity selection

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selection for increased maternal body-volume does not differ between two Scincella lizards with different reproductive modes

Selection for increased maternal body-volume does not differ...

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第七届全国野生动物生态与资源保护学术研讨会

作者： Jing Yang~1,Yan-Yan Sun~1,Tian-Bo Fu~1,Da-De Xu~2,Xiang Ji~1 (1.Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing 210046,Jiangsu,China 2.Department of Biology,Zhaoqing University,Zhaoqing 526062,Guangdong,China)

Body size and shape are among the most important determinants of reproductive output in diverse animal taxa,and the decreased reproductive output constitutes an important disadvantage of viviparity.We compared morphol... 详细信息

关键词： Reptilia Scincidae Life histories Oviparity Viviparity Reproductive output fecundity selection Body size

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Viviparous Mabuya lizards(Scincidae) do not compensate for lower reproductive output by modifying body size and shape

Viviparous Mabuya lizards(Scincidae) do not compensate for l...

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第七届全国野生动物生态与资源保护学术研讨会

作者： Yan-Yan Sun~1,Yu Du~2,Jing Yang~1,Chi-Xian lin~2,Xiang Ji~1 (1.Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing 210046,Jiangsu,China 2.Hainan Key Laboratory for Herpetological Research,School of Life Sciences,Qiongzhou University,Wuzhishan 572200,Hainan,China)

The evolution of reptilian viviparity offers pervasive benefits but entails several costs such as reduced reproductive output.We compared morphology and reproductive output between two Mabuya lizards,M.longicaudata(ov... 详细信息

关键词： Reptilia Life histories Oviparity Viviparity Reproduction fecundity selection Body size

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