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The potential geographic distribution of the invasive weed Senna obtusifolia in Australia

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Dunlop, E.A., Wilson, J.C. and Mackey, A.P. (2006) The potential geographic distribution of the invasive weed Senna obtusifolia in Australia. Weed Research, 46 (5). pp. 404-413.

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Article Link: http://dx.doi.org/10.1111/j.1365-3180.2006.00524.x

Organisation URL: http://www.ewrs.org/


Senna obtusifolia (sicklepod) is an invasive weed of northern Australia, where it significantly impacts agricultural productivity and alters natural ecosystem structure and function. Although currently restricted to northern regions, the potential for S. obtusifolia to spread south is not known. Using the eco-climatic model CLIMEX, this study simulated the potential geographic distribution of S. obtusifolia in Australia under two scenarios. Model parameters for both scenarios were derived from the distribution of S. obtusifolia throughout North and Central America. The first scenario used these base model parameters to predict the distribution of S. obtusifolia in Australia, whilst the second model predicted the distribution of a cold susceptible S. obtusifolia ecotype that is reported to occur in the USA. Both models predicted the potential for an extensive S. obtusifolia distribution, with the first model indicating suitable climatic conditions occurring predominantly in coastal regions from the Northern Territory, to far north Queensland and into northern Victoria. The cold susceptible ecotype displayed a comparatively reduced distribution in the southern parts of Australia, where inappropriate temperatures, a lack of thermal accumulation and cold stress restrict the invasion south to the coastal regions of central New South Wales. The extent of the predicted distribution of both ecotypes of S. obtusifolia reinforces the need for strategic management at a national scale.

Item Type:Article
Corporate Creators:QPIF, Biosecurity Queensland, DNR&W
Additional Information:© The Authors © European Weed Research Society.
Keywords:CLIMEX; containment; eco-climatic; modelling; sicklepod; tropics.
Subjects:Science > Invasive Species > Plants
Science > Statistics > Simulation modelling
Science > Invasive Species > Modelling > Plant
Live Archive:16 Nov 2009 04:47
Last Modified:03 Sep 2021 16:48

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