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Departure from naturalized to invasive stage:a disturbanceinduced mechanism and associated interacting factors

Journal of Plant Ecology 2010年第4期3卷 231-242页

作者： Amit Chakraborty Bai-Lian Li Ecological Complexity and Modeling Laboratory Department of Botany and Plant SciencesUniversity of CaliforniaRiversideCA 92521-0124USA Center for Conservation Biology University of CaliforniaRiversideCA 92521-0334USA CAU-UCR International Center for Ecology and Sustainability University of CaliforniaRiversideCA 92521USA

Aims Within a habitat of multiple plant species,increased resource availabilities and altered species abundances following disturbances create opportunities for exotic species to successfully establish and subsequently naturalize into its non-native *** post-disturbance changes in abiotic and biotic environments may also promote a naturalized exotic species(or invading species)to become invasive through rapid colonization of the habitat sites by reducing the extent and size of resident plant *** combining species life history traits with that of the disturbance-induced changes in habitat characteristics,we aimed to determine those interacting factors and associated mechanism allowing an exotic invasion to start *** We used a modified version of the classic competition–colonization(CC)model which was formulated first by Hastings(1980)and studied later by Tilman(1994)to explain spatial coexistence of multiple *** this model framework,recruitment-limited spatial competition has explicitly been linked with interspecific resource competition without altering the basic assumptions and structure of the original CC *** findings The model results showed that at a constant rate of resource supply,invading species can stably coexist with native species via trade-offs between species competitive ability and colonizing *** the other hand,the model predicted that with a fluctuating resource condition,invading species can successfully invade a habitat following continuous reductions in the size and extent of native *** or not invading species holds competitive superiority over the native species for limiting resource,we showed that there exists a range of variation in available resource that allows an exotic invasion to start off in post-disturbance *** associated disturbance-induced mechanism promoting invading species to become invasive has been *** states that occurrences of disturbances suc

关键词： invasion naturalized species spatial competition propagule supply resource variation

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Intercontinental comparison of phylogenetic relatedness in introduced plants at the transition from naturalization to invasion:A case study on the floras of South Africa and China

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Plant Diversity 2023年第4期45卷 363-368页

作者： Hong Qian Research and Collections Center Illinois State Museum1011 East Ash StreetSpringfieldIL 62703USA

Invasive species may pose significant threats to biodiversity and ecosystem structure and *** number of introduced species that have become invasive is substantial and is rapidly *** potentially invasive species and preventing their expansion are of critical importance in invasion *** relatedness between invasive and native species has been used in predicting invasion *** studies on the phylogenetic relatedness of plants at the transition from naturalization to invasion have shown mixed results,which may be because different methods were used in different ***,I use the same method to analyze two comprehensive data sets from South Africa and China,using two phylogenetic metrics reflecting deep and shallow evolutionary histories,to address the question whether the probability of becoming invasive is higher for naturalized species distantly related to the native *** study suggests that the probability of becoming invasive is higher for naturalized species closely related to the native *** finding of my study is consistent with Darwin's preadaptation hypothesis.

关键词： Angiosperms Exotic species Introduced species Invasive species naturalized species Phylogenetic relatedness

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