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Invaders’ control on post-disturbance succession in coastal mangroves

Journal of Plant Ecology 2012年第2期5卷 157-166页

作者： Shekhar R.Biswas Md.Saiful Islam Khan Azim U.Mallik Department of Ecology and Evolutionary Biology University of Toronto3359 Mississauga RoadMississaugaOntario L5L1C6Canada United Nations Environment Programme-World Conservation Monitoring Centre(UNEP-WCMC) Cambridge CB30DLUK Forest and Landscape LIFECopenhagen University1958 Frederiksberg CDenmark Department of Biology Lakehead University955 Oliver RoadThunder BayOntario P7B 5E1Canada

Aims In recent years,coastal mangroves have been frequently affected by large disturbances(cyclones,hurricanes,flooding and tsunamis)and post-disturbance vegetation is often dominated by small stature mangrove,mangrove-associate and non-mangrove species potentially affecting ecosystem *** on the processes of mangrove vegetation development and recovery(succession)following normal and large disturbances will benefit practitioners in designing robust ecosystem management/restoration *** we propose a conceptual model of disturbance-mediated succession in *** Based on field observations and species’life history traits,we develop conceptual models of mangrove succession under normal disturbance regime and recently experienced increased frequency of large *** evaluate our conceptual models by conducting a scenario testing *** Findings We suggest two predominant processes affecting mangrove succession after disturbance:propagule limitation due to damage of seed producing mature trees and dispersal barrier resulting from biological invasion associated with large *** argue that large disturbances affect mature trees more than the small-stature non-tree(shrubs,herbs and climbers)species creating a larger propagule shortage for mangrove tree species than non-tree ***,large disturbances facilitate invasion of free-floating aquatics,which may interfere with the flow-facilitated propagule dispersal and seedling establishment of mangrove *** a scenario testing experiment,we have shown that similar levels of disturbance impact vegetation development and recovery differently depending on the presence or absence of invasive *** conclude that since biological invasion is one of the major drivers of post-disturbance mangrove succession,the dimension of biological invasion should be included in prediction,management and restoration of mangrove forests.

关键词： biological invasion cryptic ecological degradation dispersal barrier large disturbances mangrove restoration mangrove succession

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