The geographical diversification in varanid lizards:the role of mainland versus island in driving species evolution  

作　　者：Xia-Ming ZHU Yu Du Yan-Fu Qu Hong LI Jian-Fang GAO Chi-Xian LIN Xiang JI Long-Hui LIN 

机构地区：[1]Hangzhou Key Laboratory for Ecosystem Protection and Restoration,College of Lite and Environmental Sciences,Hangzhou Normal University,Hangzhou,311121,China [2]Jiangsu Key Laboratory for Biodiversity and Biotechnology,College of Life Sciences,Nanjing Normal University,Nanjing,210023,China [3]Hainan Key Laboratory for Herpetological Research,College of Fisheries and Life Science,Hainan Tropical 0cean University,Sanya,572022,China

出　　处：《Current Zoology》2020年第2期165-171,共7页动物学报（英文版）

基　　金：This work was supported by grants from the Narural Science Foundation of Zhejiang Province to L-H.L.(LY17C030003);National Natural Science Foundation of China to L.-H,L.(31971414)and XJ(31470471);Finance Science and Technology Project of Hainan Province to Y.D.(ZDYF2018219).

摘　　要：Monitor lizards(Varanidae)inhabit both the mainland and islands of all geological types and have diversified into an exceptionally wide range of body sizes,thus providing an ideal model for examining the role of mainland versus island in driving species evolution.Here we use phylogenetic comparative methods to examine whether a link exists between body size driven diversification and body size-frequency distributions in varanid lizards and to test the hypothesis that island lizards differ from mainland species in evolutionary processes,body size,and life-history traits(offspring number and size).We predict that:1)since body size drives rapid diversification in groups,a link exists between body size-driven diversification and body size-frequency distributions;2)because of various environments on island,island species will have higher speciation,extinction,and dispersal rates,compared with mainland species;3)as a response to stronger intraspecific competition,island species will maximize individual ability associated with body size to outcompete closely-related species,and island species will produce smaller clutches of larger eggs to increase offspring quality.Our results confirm that the joint effect of differential macroevolutionary rates shapes the species richness pattern of varanid lizards.There is a link between body size-driven diversification and body sizefrequency distributions,and the speciation rate is maximized at medium body sizes.Island species will have higher speciation,equal extinction,and higher dispersal rates compared with mainland species.Smaller clutch size and larger hatchling in the island than in mainland species indicate that offspring quality is more valuable than offspring quantity for island varanids.

关 键 词：body size ISLAND MAINLAND trait-driven DIVERSIFICATION VARANIDAE 

分 类 号：Q95[生物学—动物学]