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Positive interactions can produce species-rich communities and increase species turnover through time

Journal of Plant Ecology 2012年第4期5卷 417-421页

作者： Youshi Wang M.D.Farnon Ellwood fernando tmaestre Zhiyong Yang Gang Wang Chengjin Chu MOE Key Laboratory of Western China’s Environmental Systems Research School of Arid Environment and Climate ChangeLanzhou UniversityLanzhou 730000China Department of Zoology University of CambridgeDowning StreetCambridge CB23EJUK Area de Biodiversidad y Conservacion Departamento de Biología y GeologíaESCETUniversidad Rey Juan Carlosc/Tulipan s/n28933 MostolesSpain State Key Laboratory of Grassland Agro-ecosystems School of Life SciencesLanzhou UniversityLanzhou 730000China

Aims The process of facilitation,where a species increases the survival,growth,and fitness of another species,is becoming increasingly recognized as a critical factor in shaping the structure of plant *** process is particularly important in stressful *** few studies have attempted to incorporate positive interactions into community ecological theories such as the neutral theory of ***,we use an equalizing trade-off model as a foundation to study the potential impact of facilitation on species richness and community temporal *** Based on a spatially explicit birth–death trade-off model,we assume that the occurrence of facilitation is dependent on the presence of interspecific *** further propose that the realized birth rate for a given individual subject to facilitation is proportional to the number of interspecific neighbours within its ***,in our model,the individuals of rare species will benefit more from the existence of heterospecific individuals than common *** Findings As the facilitative coefficient increased,the species richness for simulated communities at the dynamically stochastic equilibrium was also *** also demonstrated that facilitation could increase the replacement of species through time:communities with facilitation become more dissimilar(*** smaller Bray–Curtis similarity values)than communities without or with a lower degree of facilitation after the same time *** from interspecific neighbours on rare species increased their population sizes and consequently made them less prone to extinction,thus enhancing species ***,in a saturated community,with the increase of species richness,mean population size of entire communities decreased,making species more prone to extinction on average,and thus increased the community temporal *** results suggest that future experimental work on the effect of

关键词： Bray–Curtis similarity index positive interactions species coexistence species temporal turnover

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