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Zhao B.L.,Key Laboratory of Agro environments in Tropics | Zhao B.L.,South China Agricultural University | Fang L.,Key Laboratory of Agro environments in Tropics | Fang L.,South China Agricultural University | And 10 more authors.
Allelopathy Journal | Year: 2015

The toxicity of cold water (25±1℃) and boiling water extracts of 5-invasive plants including Mikania micrantha (Kunth), Wedelia trilobata (Linnaeus), Ageratum conyzoides (Linnaeus), Ambrosia artemisiifolia (Linnaeus) and Spartina alterniflora (Loisel) was examined on mortality of golden apple snails (Pomacea canaliculata Lamarck). The cold water extracts were more toxic than boiling water extracts. The toxic potential of tested water extracts followed the order: M. micrantha > W. trilobata > A. conyzoides > A. artemisiifolia > S. alterniflora. The toxicity of water extracts varied with concentration. Among the 5-plants tested, M. micrantha proved most toxic to snails. © 2015, International Allelopathy Foundation. All rights Reserved.

Qin Z.,South China Agricultural University | Qin Z.,Key Laboratory of Agro Environments in Tropics | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environments in Tropics | And 5 more authors.
Journal of Plant Research | Year: 2015

Wedelia trilobata (L.) Hitchc., an ornamental groundcover plant introduced to areas around the world from Central America, has become invasive in many regions. To increase understanding of its geographic distribution and potential extent of spread, two presence-only niche-based modeling approaches (Maxent and GARP) were employed to create models based on occurrence records from its: (1) native range only and (2) full range (native and invasive). Models were then projected globally to identify areas vulnerable to W. trilobata invasion. W. trilobata prefers hot and humid environments and can occur in areas with different environmental conditions than experienced in its native range. Based on native and full occurrence points, GARP and Maxent models produced consistent distributional maps of W. trilobata, although Maxent model results were more conservative. When used to estimate the global invasive distribution of the species, both modeling approaches projected the species to occur in Africa. The GARP full model succeeded in predicting the known occurrences in Australia, while the other models failed to identify favorable habitats in this region. Given the rapid spread of W. trilobata and the serious risk of this species poses to local ecosystems, practical strategies to prevent the establishment and expansion of this species should be sought. © 2015, The Botanical Society of Japan and Springer Japan.

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