Positive interactions by cushion plants in high mountains:fact or artifact?

作     者：Marco A.Molina-Montenegro Rómulo Oses Ian S.Acuña-Rodríguez Cristian Fardella Ernesto I.Badano Patricio Torres-Morales Jorge Gallardo-Cerda Cristian Torres-Díaz 

作者机构：Instituto de Ciencias BiológicasUniversidad de TalcaAvda.Lircay s/nTalcaChile Centro de Estudios Avanzados en ZonasÁridas(CEAZA)Facultad de Ciencias del MarUniversidad Católica del NorteCoquimboChile División de Ciencias AmbientalesInstituto Potosino de Investigación Científica y TecnológicaCamino a la Presa San José2055Colonia Lomas ta SecciónCP 78216San Luis PotosíSLPMéxico 4 Instituto de Ciencias Ambientales y EvolutivasUniversidad Austral de ChileValdiviaChile Departamento CientíficoInstituto Antártico Chileno(INACH)Punta ArenasChile Laboratorio de Genómica y Biodiversidad(LGB)Departamento de Ciencias NaturalesUniversidad del Bío-BíoChillánChile 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2016年第9卷第2期

页      面：117-123页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 

主　　题：cushion plants facilitation nurse effect positive interactions stress gradient hypothesis 

摘      要：Positive interactions are defined as non-trophic interactions where at least one of the interacting species is benefited in terms of fitness and the other remains ***,the bidirectional feedbacks between species may be positive,neutral or ***,if facilitated species induce negative effects on their‘nurses’,the assumed definition of positive interactions could be *** We assessed if ecological interactions between cushions of Azorella madreporica and their facilitated species are ***,we tested if cover of facilitated species has any costs for cushion plants from an ecophysiological perspective,and if these costs increase with the amount of cover of facilitated *** addition,through pathway analysis and correlations,we assessed if cover and richness of facilitated species have a direct and/or indirect effect on the fitness of cushion *** Findings We found that facilitated plant species induced a significant cost for their nurses(cushion plants),and this cost increases with cover of the facilitated ***,the facilitated species exert a strong direct negative effect on the cushion’s fitness and a moderate indirect negative cost evident through the nutrient status and physiological performance of cushion *** thus contribute evidence that positive interactions between high mountain cushion plants of central Chile and their‘facilitated’species may be an artifact more than a fact,especially when bidirectional effects are considered;contrasting with the majority of studies that document only one side of the interaction.