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Auteur Bérenger Bourgeois
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Ecological specialization and rarity of arable weeds: insights from a comprehensible survey in France / François Munoz in Plants, 9 (7) (July 2020)
Titre : Ecological specialization and rarity of arable weeds: insights from a comprehensible survey in France Type de document : Électronique Auteurs : François Munoz (1978-), Auteur ; Guillaume Fried, Auteur ; Laura Armengot, Auteur ; Bérenger Bourgeois, Auteur ; Vincent Bretagnolle, Auteur ; Joël Chadoeuf, Auteur ; Lucie Mahaut (1990-), Auteur ; Christine Plumejeaud, Auteur ; Jonathan Storkey, Auteur ; Cyrille Violle, Auteur ; Sabrina Gaba (1978-), Auteur Année de publication : 2020 Article en page(s) : 824 Langues : Anglais (eng) Résumé : The definition of “arable weeds” remains contentious. Although much attention has been devoted to specialized, segetal weeds, many taxa found in arable fields also commonly occur in other habitats. The extent to which adjacent habitats are favorable to the weed flora and act as potential sources of colonizers in arable fields remains unclear. In addition, weeds form assemblages with large spatiotemporal variability, so that many taxa in weed flora are rarely observed in plotbased surveys. We thus addressed the following questions: How often do weeds occur in other habitats than arable fields? How does including field edges extend the taxonomic and ecological diversity of weeds? How does the weed flora vary across surveys at different spatial and temporal scales? We built a comprehensive dataset of weed taxa in France by compiling weed flora, lists of specialized segetal weeds, and plot-based surveys in agricultural fields, with different spatial and temporal coverages. We informed life forms, biogeographical origins and conservation status of these weeds. We also defined a broader dataset of plants occupying open habitats in France and assessed habitat specialization of weeds and of other plant species absent from arable fields. Our results show that many arable weeds are frequently recorded in both arable fields and noncultivated open habitats and are, on average, more generalist than species absent from arable fields.Surveys encompassing field edges included species also occurring in mesic grasslands and nitrophilous fringes, suggesting spill-over from surrounding habitats. A total of 71.5% of the French weed flora was not captured in plot-based surveys at regional and national scales, and many rare and declining taxa were of Mediterranean origin. This result underlines the importance of implementing conservation measures for specialist plant species that are particularly reliant on arable fields as a habitat, while also pointing out biotic homogenization of agricultural landscapes as a factor in the declining plant diversity of farmed landscapes. Our dataset provides a reference species pool for France, with associated ecological and biogeographical information. Lien pérenne : DOI : 10.3390/plants9070824
in Plants > 9 (7) (July 2020) . - 824Munoz, F., Fried, G., Armengot, L., Bourgeois, B., Bretagnolle, V., Chadoeuf, J., Mahaut, L., Plumejeaud, C., Storkey, J., Violle, C., Gaba, S. 2020. Ecological specialization and rarity of arable weeds: insights from a comprehensible survey in France. Plants, 9(7): 824.
Weed diversity is driven by complexinterplay between multi-scale dispersaland local filtering / Bérenger Bourgeois in Proceedings of the Royal Society. Biological Sciences, 287 (1930) (2020)
Titre : Weed diversity is driven by complexinterplay between multi-scale dispersaland local filtering Type de document : Imprimé Auteurs : Bérenger Bourgeois ; Sabrina Gaba (1978-) ; Christine Plumejeaud ; Vincent Bretagnolle Année de publication : 2020 Article en page(s) : 20201118 Langues : Anglais (eng) Catégories : [Thématique] Communauté végétale
Résumé : Arable weeds are key organisms for biodiversity maintenance and ecosystem service provision in agroecosystems. Disentangling the drivers of weed diversity is critical to counteract the global decline of farmland biodiversity. Even if distinct scale-dependent processes were alternatively proposed, no general framework unifying the multi-scale drivers of weed dynamics has yet emerged. Here, we investigate the joint effects of field- and landscape-scale processes on weed assemblages in 444 arable fields. First, field margins sheltered greater weed diversity than field core, evidencing their role as biodiversity refugia. Second, community similarity between field core and margin decreased with the distance to margin, highlighting a major role of local dispersal. Third, weed diversity at field margins increased with organic field cover in the landscape, pointing out massive regional dispersal. Fourth, while both local and landscape dispersal explained up to 41% of field core weed diversity, crop type strongly modulated their strength, depicting an intense filtering effect by agricultural management. This study sheds new light on the complex multi-scale interactions shaping weed diversity, field margins playing a key role by strengthening regional dispersal and sustaining local dispersal. Land-sharing strategies improving habitat heterogeneity both locally and regionally should largely promote agroecosystem multifunctionality and sustainability. Lien pérenne : DOI : 10.1098/rspb.2020.1118
in Proceedings of the Royal Society. Biological Sciences > 287 (1930) (2020) . - 20201118Bourgeois, B., Gaba, S., Plumejeaud, C., Bretagnolle, V. 2020. Weed diversity is driven by complexinterplay between multi-scale dispersaland local filtering. Proceedings of the Royal Society. Biological Sciences, 287(1930): 20201118.