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Ajouter le résultat dans votre panierWeed 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 : [LOTERRE-Biodiversité] Communauté végétale
[CBNPMP-Thématique] BiodiversitéRésumé : 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 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=149393
in Proceedings of the Royal Society. Biological Sciences > 287 (1930) (2020) . - 20201118Bourgeois, Bérenger, Gaba, Sabrina (1978-), Plumejeaud, Christine, Bretagnolle, Vincent 2020 Weed diversity is driven by complexinterplay between multi-scale dispersaland local filtering. Proceedings of the Royal Society. Biological Sciences, 287(1930): 20201118.Documents numériques
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Titre : Nutrients and warming interact to force mountain lakes into unprecedented ecological states Type de document : Imprimé Auteurs : Isabella A. Oleksy ; Jill Sa Baron ; Peter R. Leavitt ; Sarah A. Spaulding Année de publication : 2020 Article en page(s) : 20200304 Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[LOTERRE-Biodiversité] Changement climatiqueRésumé : While deposition of reactive nitrogen (N) in the twentieth century has been strongly linked to changes in diatom assemblages in high-elevation lakes, pronounced and contemporaneous changes in other algal groups suggest additional drivers. We explored the origin and magnitude of changes in two mountain lakes from the end of the Little Ice Age at ca 1850, to ca 2010, using lake sediments. We found dramatic changes in algal community abundance and composition. While diatoms remain the most abundant photosynthetic organisms, concentrations of diatom pigments decreased while pigments representing chlorophytes increased 200–300% since ca 1950 and total algal biomass more than doubled. Some algal changes began ca 1900 but shifts in most sedimentary proxies accelerated ca 1950 commensurate with many human-caused changes to the Earth System. In addition to N deposition, aeolian dust deposition may have contributed phosphorus. Strong increases in summer air and surface water temperatures since 1983 have direct and indirect consequences for high-elevation ecosystems. Such warming could have directly enhanced nutrient use and primary production. Indirect consequences of warming include enhanced leaching of nutrients from geologic and cryosphere sources, particularly as glaciers ablate. While we infer causal mechanisms, changes in primary producer communities appear to be without historical precedent and are commensurate with the post-1950 acceleration of global change. Lien pérenne : DOI : 10.1098/rspb.2020.0304 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=152152
in Proceedings of the Royal Society. Biological Sciences > 287 (1930) (2020) . - 20200304Oleksy, Isabella A., Baron, Jill Sa, Leavitt, Peter R., Spaulding, Sarah A. 2020 Nutrients and warming interact to force mountain lakes into unprecedented ecological states. Proceedings of the Royal Society. Biological Sciences, 287(1930): 20200304.Documents numériques
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