The allocation between egg size and clutch size depends on local nest survival rate in a mean of bet-hedging in a shorebird  

作　　者：Zitan Song Xin Lin Pinjia Que Naerhulan Halimubieke Qin Huang Zhengwang Zhang Tamás Székely Yang Liu 

机构地区：[1]State Key Laboratory of Biocontrol,College of Ecology/School of Life Sciences,Sun Yat-Sen University,Guangzhou 510275,Guangdong,China [2]Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,College of Life Sciences,Beijing Normal University,Beijing 100875,China [3]Milner Centre for Evolution,Department of Biology and Biochemistry,University of Bath,Bath BA17AY,UK [4]Department of Evolutionary Zoology,University of Debrecen,Debrecen 4032,Hungary

出　　处：《Avian Research》2020年第4期465-474,共10页鸟类学研究（英文版）

基　　金：This work was supported by Open Fund of Key Laboratory of Biodiversity Science and Ecological Engineering,Ministry of Education to Yang Liu,the China Postdoctoral Science Foundation(No.2019M663221);the British Ornithologists’Union’s Career Development Bursary in 2019 to Zitan Song,the National Natural Science Foundation of China(Nos.31600297)to Pinjia Que;by the Hungarian Scientific Funding Agency,NKFIH(éLVONAL KKP-126949,K-116310)to Tamás Székely.

摘　　要：Background:The allocation of resources between offspring size and number is a central question of life-history theory.Although several studies have tested the existence of this trade-off,few studies have investigated how environmental variation influences the allocation of resources to offspring size and offspring number.Additionally,the relationship between population dynamics and the offspring size and number allocation is far less understood.Methods:We investigate whether resource allocation between egg size and clutch size is influenced by the ambient temperature and whether it may be related to apparent nest survival rate.We measured 1548 eggs from 541 nests of two closely related shorebird species,the Kentish Plover(Charadrius alexandrinus)and the White-faced Plover(C.dealbatus)in China,in four populations that exhibit contrasting ambient environments.We weighed females,monitored nest survival,and calculated the variance of ambient temperature.Results:Although we found that egg size and clutch size were all different between the four breeding populations,the reproductive investment(i.e.total clutch volume)was similar between populations.We also found that populations with a high survival rate had relatively larger eggs and a smaller clutch than populations with a low nest survival rate.The latter result is in line with a conservative/diversified bet-hedging strategy.Conclusions:Our findings suggest that plovers may increasing fitness by investing fewer,larger or many,small according local nest survival rate to make a similar investment in reproduction,and thereby may have an impact on population demography.

关 键 词：Ambient temperature Bet-hedging strategy Nest survival rate Resource allocation SHOREBIRDS 

分 类 号：Q958[生物学—动物学]