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Alien plant species coexist over time with native ones in Chilean Mediterranean grasslands

Journal of Plant Ecology 2016年第6期9卷 682-691页

作者： Irene Martín-Forés Isabel Castro Belén Acosta-Gallo Alejandro del Pozo Laura Sánchez-Jardón JoséM.de Miguel Carlos Ovalle Miguel A.Casado Department of Ecology Complutense University of MadridMadridSpain Department of Ecology Autónoma University of MadridMadridSpain Faculty of Agricultural Sciences University of TalcaTalcaChile Agricultural Research Institute INIA-La Cruz La CruzChile

Aims Alien species are commonly considered as harmful weeds capa-ble of decreasing native biodiversity and threatening *** this assumption,little is known about the long-term patterns of the native-alien relationships associated with human disturbed managed *** study aims to elucidate the commu-nity dynamics associated with a successional gradient in chilean Mediterranean grasslands,considering both native and alien *** Species richness(natives and aliens separately)and life-form(annu-als and perennials)were recorded in four chilean post-agricultural grazed grasslands each covering a broad successional gradient(from 1 to 40 years since crop abandonment).A detrended correspondence analysis(DcA),mixed model effects analyses and cor-relation tests were conducted to assess how this temporal gradient influenced natives and aliens through community *** Findings Our results show different life-form patterns between natives and aliens over *** were mainly represented by annuals(especially ruderals and weeds),which were established at the beginning of *** aliens also predominated at mid-successional stages,but in old grasslands native species were slightly more representative than alien ones within the *** the late successional states,positive or no correlations at all between alien and native species richness suggested the absence of competition between both species groups,as a result of differ-ent strategies in occupation of the *** dynamics over time constitute a net gain in biodiversity,increasing natives and maintaining a general alien pool,allowing the coexistence of *** interactions including facilitation and/or tolerance processes might be occurring in chilean post-agricultural grasslands,a fact that contradicts the accepted idea of the alien species as contenders.

关键词： community dynamics land abandonment gradient life-form livestock grazing successional gradient

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