Reference : First come first served: “priority effect“ benefits Ambrosia artemisiifolia L. more t...
Scientific congresses and symposiums : Poster
Life sciences : Environmental sciences & ecology
http://hdl.handle.net/2268/201669
First come first served: “priority effect“ benefits Ambrosia artemisiifolia L. more than other ruderal Asteraceae species
English
[fr] Premier arrivé, premier servi: L'effet de priorité donne un plus grand profit à l'ambroisie qu'à d'autres espèces rudérales
Ortmans, William mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage >]
Mahy, Grégory mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage >]
Monty, Arnaud mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage >]
14-Sep-2016
A0
No
No
International
Neobiota 2016 - 9th International Conference on Biological Invasions
du 14 septembre 2016 au 16 septembre 2016
Neobiota
Vianden
Luxembourg
[en] priority effect ; ragweed ; performance ; competition ; interspecific ; pollen
[fr] ambroisie ; priorité ; compétition
[en] Ambrosia artemisiifolia L. (common ragweed, Asteraceae) is an invasive weed causing a health crisis in Europe, due to its highly allergenic pollen. In Western Europe the invaded range covers most of central and southern France, and northern Italy. Northwards beyond the edge of this range, occurrence of casual population have been described for years, but these populations do not appear to become invasive, and the species does not seem to spread. This situation raises the following question: Has the invaded range reached a limit or will the species continue its invasion northwards?
To answer this question, we followed two complementary approaches. First we set up an experimental garden in Belgium, 250 km north to the current invaded range, to see if the local climate allows the completion of the species reproduction cycle. Second, we performed an in situ measurement campaign in 12 population located beyond the edge, within the range but near the margin, and in the center of the invaded range. The aim of this campaign was to test whether the species had reduced plant performance towards range margins.
The results showed that the species is able to establish populations with high growth rates in Belgium. Furthermore, the species expressed similar performance across the considered areas, even beyond the current invasion front. No evidence of processes constraining the invasion was found, which suggests a great potential for invasion north to the current invaded range. In this uncertain situation, awareness actions should be considered in the northern countries.
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers
http://hdl.handle.net/2268/201669

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