Sexual dimorphism, temporal niche differentiation, and evidence for the Jack Sprat effect in an annual dioecious plant  

作　　者：Qian Yu Spencer C.H.Barrett Xin-Jja Wang Li Zhong Hong Wang De-Zhu Li Wei Zhou 

机构地区：[1]Plant Germplasm and Genomics Center,Germplasm Bank of Wid Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Ecology and Evolutionary Biology,University of Toronto,Toronto,Ontario M5S 3B2,Canada [4]CAS Key Laboratory for Plant Diversity and Biogeography of East Asia,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China

出　　处：《Journal of Systematics and Evolution》2022年第5期1078-1091,共14页植物分类学报（英文版）

基　　金：This research was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB310000oo)to D.Z.L;the National Natural Science Foundation of china(31971394 and 31770417)to W.Z.;the Yunling Scholarship of Yunnan Province(YLXL20170001)to H.W.;a Discovery Grant to S.C.H.B.from the Natural Sciences and Engineering Research Council of Canada.

摘　　要：Sexual dimorphism in dioecious plants often occurs as a consequence of the different resource requirements of females and males,especially during reproduction.The contrasting reproductive roles of the sexes can influence the phenology of growth,plant size,and flowering time,with implications for the intensity of competitive interactions within and between the sexes.Here,we investigate the influence of contrasting nutrient regimes and intra-sexual and inter-sexual competition on the expression of sexual dimorphism in life-history traits and biomass allocation throughout the life cycle of the dioecious annual Rumex hastatulus Baldw.(Polygonaceae).Development of a sex-specific marker enabled us to quantify the influence of competition on sex-specific dfferences in mortality and vegetative traits.We were particularly interested in determining whether the overall performance of the sexes might differ between the two forms of intra-specific competition,potentially providing evidence for sexual specialization in resource acquisition and niche differentiation.Our results indicated that although patterns of sexual dimorphism were dynamic,they were largely insensitive to nutrient conditions.We found that intra-sexual competition was more severe than inter-sexual competition,differentilly affecting mortality and most traits during the vegetative and particularly the reproductive stage of the life history.Female trait values generally increased more under inter-sexual than intra-sexual competition in comparison to males.Our findings are consistent with temporal niche differentiation resulting from sexual specialization for different resource requirements and provide evidence for the"Jack Sprat effect."

关 键 词：competition experiment DIOECY Jack Sprat effect niche diferentiation Rumex hastatulus sex-specific genetic marker sexual dimorphism 

分 类 号：Q94[生物学—植物学]