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- W753384474 abstract "Weeds cost Australian agriculture over $4 billion annually through factors such as yield loss and management costs (Sinden et al. 2004). Although not quantified, the impact of weeds on natural ecosystems has also been recognised as a serious threat to biodiversity. Consequently there is a need to understand the factors that influence the distribution, spread and abundance of these invasive species, both under current and future environmental and management conditions. The aim of this Australian Weed Research Centre-funded project was to determine the potential effect of climate change on agricultural weeds of the Northern Agricultural Region (NAR) in the southwest of Western Australia (Figure 1). With this area of Western Australia, particularly the NAR, predicted to experience significant environmental impact due to climate change, the development of predictive models to determine future weed threats to the agricultural industry is essential. Using survey data on weed species distribution in the NAR and surrounding agricultural and rangeland buffer zones (Figure 1), we developed a short-list of 85 species that pose the highest risk to agricultural systems, from an initial list of 5536 unique species using criteria from Groves (2003), Randall (2007) or weed experts. This list was further refined during a workshop involving 11 weed scientists to produce a list of the 20 most threatening weeds for the NAR in 2070 (Table 1) based on the OZclim Echam5 moderate CO2 scenario. This model predicts a temperature increase of 2.5°C in summer and 1.7°C in winter, and rainfall decrease of 5 mm (16%) in summer and 40 mm (23%) in winter (CSIRO 2009). Using the South Australian Weed Risk Assessment (WRA) system developed by Virtue (2008), each of the 20 selected weed species posing the greatest risk were subjected to a detailed evaluation using standardised technical criteria to determine the invasiveness and potential impact in the NAR under the climate change scenario. The five most threatening weed species to agriculture in the NAR were selected from the WRA process. These were Chloris truncata R.Br. (Poaceae), Citrullus lanatus (Thunb.) Matsum. & Nakai (Cucurbitaceae), Conyza bonariensis (L.) Potential climate change impacts on agricultural weeds in the Northern Agricultural Region of Western Australia" @default.
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- W753384474 date "2010-01-01" @default.
- W753384474 modified "2023-09-28" @default.
- W753384474 title "Potential climate change impacts on agricultural weeds in the Northern Agricultural Region of Western Australia." @default.
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