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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Giving recipient communities a greater head start and including productive species boosts early resistance to invasion (2020)
Auteurs :	Manon C.M. Hess, Auteur ; Elise Buisson, Auteur ; Hugo Fontes, Auteur ; Léo Bacon, Auteur ; Florent Sabatier, Auteur ; François Mesléard, Auteur
Type de document :	Article
Dans :	Applied Vegetation Science (23(3) July, 2020)
Article en page(s) :	avsc.12502
Langues:	Anglais
Mots-clés :	TdV ; Plantae ; Espèce envahissante ; Ecologie végétale ; Restauration environnement
Mots-clés:	assembly ; biomass ; biotic resistance ; coexistence ; composition ; density ; historical contingencies ; invasive species ; multistate models ; priority effects ; restoration ; revegetation
Résumé :	Methods: In a pot experiment, we simulated invasion by three major invasive species (Ambrosia artemisiifolia, Bothriochloa barbinodis, and Cortaderia selloana) in soil covered with recipient communities differing in species composition (one, three or nine species), density (700 or 2,778 seeds/m2), and time advance (established one or five months previously). We assessed early invasion success by measuring seedling emergence and survival over six months. Results: Early invasion success was mainly explained by recipient community's time advance and composition (or their interaction), while density had limited influence. Polycultures (three or nine species) showed generally greater invasion resistance, most likely due to high above-ground biomass essentially produced by two species. Species composition interacted with time advance in two ways: (a) Bothriochloa barbinodis seedling emergence was impacted by composition only in communities having five months of advance, suggesting that the contribution of species composition to invasion resistance varies according to the age of the community, and (b) Ambrosia artemisiifolia and Cortaderia selloana survival was affected by time advance in polycultures only, which produced much more biomass than monocultures, implying that a greater head start provides a competitive advantage only if it allows a sufficient increase in biomass production. Conclusions: Implementing revegetation as soon as site clearance work is over, as well as establishing productive native species may help reduce invasion success. How much of an advantage recipient community time advance represents depends on biomass production.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/avsc.12502

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