Claude Lavoie

Learn More
Phenological data have recently emerged as particularly effective tools for studying the impact of climate change on plants, but long phenological records are rare. The lack of phenological observations can nevertheless be filled by herbarium specimens as long as some correction procedures are applied to take into account the different climatic conditions(More)
We studied the natural regeneration of an ombrotrophic peatland (Cacouna bog) located in southern Québec that was disturbed by peat mining and other anthropogenic activities over a 200-year period. Using an extensive collection of historical documents, as well as dendrochronological data, we reconstructed the history of the peatland. We also sampled(More)
The introduced subspecies of the common reed (Phragmites australis (Cav.) Trin. ex Steud. subsp. australis; Poaceae) is considered one of the most invasive plants in North American wetlands. Given its relatively low seed set and its tremendous capacity to spread via stolons or rhizomes, it has generally been thought that the spread of vegetative diaspores(More)
The recent development of peatlandrestoration activities indicates thatmodern peat mining techniques seriouslyhamper the natural capacity of bogecosystems to regenerate after adisturbance. However, some plants have theability to colonize dry peat deposits, andseem to help stabilize the soil surface andfacilitate the establishment of other plantspecies. In(More)
Purple loosestrife (Lythrum salicaria L., Lythraceae) is considered one of the worst invasive plant species in the world. In this paper, I reconstruct how purple loosestrife quickly became, after a long (150 years) period of indifference, the persona non grata of North American wetlands. I then compare the portrayal of the species in newspapers (907(More)
Roads function as prime habitats and corridors for invasive plant species. Yet despite the diversity of road types, there is little research on the influence of these types on the spread of invaders. Common ragweed (Ambrosia artemisiifolia), a plant producing large amounts of allergenic pollen, was selected as a species model for examining the impact of(More)
We studied from 1998 to 2002 the fine-scale vegetation dynamics of a poorly regenerated vacuum-mined bog located in southern Quebec. We selected mined sites that have been abandoned for 14 years and monitored the vascular and non-vascular plants, and some hydrological characteristics. We focussed our study on the monitoring of cotton-grass (Eriophorum(More)
We studied from 1998 to 2003 the fine-scale vegetation dynamics of an abandoned vacuummined bog located in southern Québec in which cotton-grass (Eriophorum vaginatum) has become dominant. A water table no deeper than 30–40 cm below the soil surface combined with a volumetric peat water content>70% in the surface peat layer favored the increase in(More)
Climate change will likely affect flooding regimes, which have a large influence on the functioning of freshwater riparian wetlands. Low water levels predicted for several fluvial systems make wetlands especially vulnerable to the spread of invaders, such as the common reed (Phragmites australis), one of the most invasive species in North America. We(More)