comCompetition for resources is ameliorated by niche differentiation between Solidago virgaurea life-history stages in the Arctic  

作　　者：Tiina Savolainen Minna-Maarit Kytöviita 

机构地区：[1]Department of Biological and Environmental Science,University of Jyvaskyla,PO Box 35,FI-40014 Jyvaskyla,Finland

出　　处：《Journal of Plant Ecology》2017年第6期907-917,共11页植物生态学报（英文版）

基　　金：Ella and Georg Ehrnrooth Foundation;The Finnish Cultural Foundation;Academy of Finland(127657).

摘　　要：Aims competition has been shown to modify the niche breadth of coex-isting species,but within-species interactions have received little attention.Establishing small juvenile individuals and established,larger,sexually reproducing adult individuals represent two life-his-tory stages within species.We investigated the nitrogen and carbon resource use of adult and juvenile individuals and similarity of sym-biotic fungal community composition in these two plant life stages.We used the plant Solidago virgaurea growing in a simplified system in the low Arctic as model species.Methods Isotopic signatures(foliarδ15N and foliarδ13c)were analysed to characterize nitrogen acquisition and water-use efficiency of the plants.Symbiotic root fungal community composition was esti-mated by cloning and sequencing small subunit ribosomal RNA gene.Important Findings The isotopic signatures differed significantly between the life stages,indicating that the establishing juvenile cohort used relatively more amino acids or gained N through mycorrhizal symbiosis in com-parison to the established adult plants.Symbiotic fungal commu-nities did not differ between the two plant cohorts suggesting a possibility that the plants shared the same mycorrhizal network.We conclude that competition-mediated differences in plant resource use may create niche differentiation between the two life-history stages and enable them to coexist.

关 键 词：COMPETITION low Arctic NICHE resource use stable isotope natural abundance 

分 类 号：Q94[生物学—植物学]