Distribution, demography and dispersal model of spatial spread of invasive plant populations with limited data

Methods in Ecology and Evolution - Tập 6 Số 7 - Trang 782-794 - 2015
Vanessa M. Adams1, Aaron M. Petty1, Michael M. Douglas1, Yvonne M. Buckley2,3, Keith B. Ferdinands4, Toshio Okazaki1, Dongwook W. Ko5, Samantha A. Setterfield1
1Research Institute for the Environment and Livelihoods and Northern Australia National Environmental Research Program Hub, Charles Darwin University, Darwin, NT, 0909 Australia
2ARC Center of Excellence for Environmental Decisions, School of Biological Sciences, University of Queensland, Brisbane, Qld, 4072 Australia
3School of Natural Sciences and Trinity Centre for Biodiversity Research, Trinity College Dublin, Zoology, Dublin 2, Ireland
4Department of Land Resource Management, Weed Management Branch, Palmerston, NT, 0831 Australia
5Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT 0909, Australia

Tóm tắt

Summary Invasive weeds are a major cause of biodiversity loss and economic damage world‐wide. There is often a limited understanding of the biology of emerging invasive species, but delay in action may result in escalating costs of control, reduced economic returns from management actions and decreased feasibility of management. Therefore, spread models that inform and facilitate on‐ground control of invasions are needed. We developed a spatially explicit, individual‐based spread model that can be applied to both data‐poor and data‐rich situations to model future spread and inform effective management of the invasion. The model is developed using a minimum of two mapped distributions for the target species at different times, together with habitat suitability variables and basic population data. We present a novel method for internally calibrating the reproduction and dispersal distance parameters. We use a sensitivity analysis to identify variables that should be prioritized in future research to increase robustness of model predictions. We apply the model to two case studies, gamba grass and para grass, to provide management advice on emerging weed priorities in northern Australia. For both species, we find that the current extent of invasion in our study regions is expected to double in the next 10 years in the absence of management actions. The predicted future distribution identifies priority areas for eradication, control and containment to reduce the predicted increase in infestation. The model was built for managers and policymakers in northern Australia working on species where expert knowledge and environmental data are often lacking, but is flexible and can be easily adapted for other situations, for example where good data are available. The model provides predicted probability of occurrence over a user‐specified, typically short‐term, time horizon. This output can be used to direct surveillance and management actions to areas that have the highest likelihood of rapid invasion and spread. Directing efforts to these areas provides the greatest likelihood of management success and maximizes the return on investment in management response.

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Methods in Ecology and Evolution

Tập 6 Số 7

782-794

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