New Phytologist Research Multiple mechanisms underlie rapid expansion of an invasive alien plant Rui Wang1,2, Jin-Feng Wang3, Zhi-Jing Qiu2, Bin Meng4, Fang-Hao Wan1 and Yin-Zheng Wang2 1State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China; 2State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 3State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 4College of Arts & Science of Beijing Union University, Beijing 100083, China Summary Authors for correspondence: • With growing concerns over serious ecological problems, a particular challenge Yin-Zheng Wang is to reveal the complex mechanisms underlying rapid expansion of invasive spe- Tel: +86 10 62836474 cies. Ageratina adenophora is of particular interest in addressing this question. Email:
[email protected] • We used geographic information systems and logistic regression to identify the Fang-Hao Wan geographic and environmental factors contributing to the presence of A. Tel: +86 10 82105927 adenophora. Join-count spatial statistics with reproduction mode examination Email:
[email protected] were employed to elucidate the spatiotemporal dispersal mechanisms. Received: 24 October 2010 • Multiple factors have significantly contributed to the rapid expansion of A. Accepted: 3 March 2011 adenophora. Its biological traits, favoring dispersal by water and wind coupled with local spatiotemporally heterogeneous geography and ecology, promote inva- New Phytologist (2011) sion downstream and upstream along river valleys, while other factors associated doi: 10.1111/j.1469-8137.2011.03720.x with human activities facilitate its invasion over high mountains and across river valleys, providing new scope for progressive invasions.