| Genetic analyses at the regional scale suggest that native haplotypes of common reed (Phragmites australis (Cav.) Trin. ex Steud.) have been displaced by an introduced Eurasian haplotype (M). However, the outcomes of competitive interactions at the population level between these closely related plants are unknown, especially in freshwater wetlands. The research objective was to assess and compare the spatial and temporal dynamics of the exotic (M) and native (F) haplotypes in freshwater wetlands. Specifically, the expansion patterns of each haplotype (1) into adjacent plant communities, and (2) at the intersection between exotic and native populations, were monitored for three years in permanent plots in the Lake St-Francois National Wildlife Area, Quebec, Canada. Results showed that both haplotypes were progressing, but the densification rate of the exotic haplotype was higher, suggesting greater impact on invaded plant communities. Contrary to expectations, there was no clear evidence after three years that the exotic haplotype was displacing the native haplotype where they intersected.;Keywords: biological invasion, plant competition, community dynamics, conservation area, wildlife reserve, wetland, Phragmites australis. |
