Contrasting size-dependent life history strategies of an insular lizard  

作　　者：Andreu Rotger Jose Manuel Igual Giacomo Tavecchia 

机构地区：[1]Animal Demography and Ecology Unit,GEDA,IMEDEA(CSIC-UIB),c M.Marques 21,01790,Esporles,Spain

出　　处：《Current Zoology》2020年第6期625-633,共9页动物学报（英文版）

基　　金：A.R.was supported by JAE fellowship(JAEPreO31,Spanish National Research Council(CSIC)-Spanish Minister for Science,Innovation and Universities);The research was partially financed by the Spanish Minister for Science,Innovation and Universities(project number BFU2009-09359).

摘　　要：In many species with continuous growth,body size is an important driver of life-history tactics and its relative importance is thought to reflect the spatio-temporal variability of selective pressures.We developed a deterministic size-dependent integral projection model for 3 insular neighboring lizard populations with contrasting adult body sizes to investigate how size-related selective pressures can influence lizard life-history tactics.For each population,we broke down differences in population growth rates into contributions from size-dependent body growth,survival,and feeundity.A life table response experiment(LTRE)was used to compare the population dynamics of the 3 populations and quantify the contributions of intrinsic demographic coefficients of each population to the population growth rate(z).Perturbation analyses revealed that the largest adults contributed the most to the population growth rate,but this was not true in the population with the smallest adults and size-independent fertility.Although we were not able to identify a single factor responsible for this difference,the combination of the demographic model on a continuous trait coupled with an LTRE analysis revealed how individuals from sister populations of the same species follow different life strategies and showed different compensatory mechanisms among survival,individual body growth,and fertility.Our results indicate that body size can play a contrasting role even in closely-related and closely-spaced populations.

关 键 词：body size CAPTURE-RECAPTURE integral projection model Lilfords lizard size-dependent mortality 

分 类 号：Q95[生物学—动物学]