Phenotypic divergence during the invasion of phyla canescens in Australia and France: evidence for selection-driven evolution

Xu, Cheng-Yuan and Julien, Mic H. and Fatemi, Mohammed and Girod, Christophe and van Klinken, Rieks D. and Gross, Caroline L. and Novak, Stephen J. (2010) Phenotypic divergence during the invasion of phyla canescens in Australia and France: evidence for selection-driven evolution. Ecology Letters, 13 (1). pp. 32-44. ISSN 1461-023X

Abstract

Rapid adaptive evolution has been advocated as a mechanism that promotes invasion. Demonstrating adaptive evolution in invasive species requires rigorous analysis of phenotypic shifts driven by selection. Here, we document selection-driven evolution of Phyla canescens, an Argentine weed, in two invaded regions (Australia and France). Invasive populations possessed similar or higher diversity than native populations, and displayed mixed lineages from different sources, suggesting that genetic bottlenecks in both countries might have been alleviated by multiple introductions. Compared to native populations, Australian populations displayed more investment in sexual reproduction, whereas French populations possessed enhanced vegetative reproduction and growth. We partitioned evolutionary forces (selection vs. stochastic events) using two independent methods. Results of both analyses suggest that the pattern of molecular and phenotypic variability among regions was consistent with selection-driven evolution, rather than stochastic events. Our findings indicate that selection has shaped the evolution of P. canescens in two different invaded regions.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held. First published online: 22 Oct 2009
Depositing User: Dr Chengyuan-Stephen Xu
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 16 Aug 2010 00:35
Last Modified: 02 Jul 2013 23:50
Uncontrolled Keywords: biological invasions; differentiation; multiple introductions; phenotypic evolution; selection; sexual reproduction; stochastic events; vegetative reproduction
Fields of Research (FOR2008): 06 Biological Sciences > 0603 Evolutionary Biology > 060303 Biological Adaptation
05 Environmental Sciences > 0501 Ecological Applications > 050103 Invasive Species Ecology
06 Biological Sciences > 0607 Plant Biology > 060703 Plant Developmental and Reproductive Biology
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified
Identification Number or DOI: doi: 10.1111/j.1461-0248.2009.01395.x
URI: http://eprints.usq.edu.au/id/eprint/7690

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