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Auteur Laura Armengot
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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.
Effects of agricultural intensification on plant diversity in Mediterranean dryland cereal fields / José-María Laura in Journal of applied ecology, 47 (4) (August 2010)
Titre : Effects of agricultural intensification on plant diversity in Mediterranean dryland cereal fields Type de document : Imprimé Auteurs : José-María Laura ; Laura Armengot ; José Manuel Blanco Moreno ; Montserrat Bassa ; Francesc Xavier Sans Année de publication : 2010 Article en page(s) : 832-840 Langues : Français (fre) Catégories : [Thématique] Messicole Résumé : 1. Agricultural intensification, at field and landscape scales, has caused a decrease in weed richness and changes in species composition. In order to prevent this loss of diversity and develop efficient management regimes, it is important to understand how both aspects of intensification affect plant diversity and the way in which they interact. 2. This study assessed plant diversity at the centre, edges and boundaries of 29 organic and 29 conventional cereal fields distributed in 15 agrarian localities of the NE Iberian Peninsula. We focused on the composition of plant assemblages and on the specific richness at the field level, which was calculated for the whole set of species and for that of characteristic arable weeds. The percentage of arable land together with human settlements was used as a surrogate for landscape complexity and the amount of nitrogen inputs for land-use intensity. 3. Our results show that both scales of agricultural intensification have a similar negative effect on the total plant species and characteristic arable weed richness, and they also affect plant assemblages. Furthermore, we found no strong interaction between landscape and land-use intensity for explaining total plant richness. 4. The relative importance of farming intensity and landscape varies depending on the location within the field, which can be attributed to differences in the agricultural impact and limited seed dispersal from adjacent habitats. Management is the main factor in explaining differences among field centres, whereas changes at boundaries are mainly due to landscape characteristics, and at edges both factors are relevant. 5. Synthesis and applications. To preserve agricultural plant diversity it is equally important to prevent agricultural intensification at field and landscape scales. Policies enhancing low-intensity management techniques, such as organic farming, are the main way to promote diversity inside the fields and will be equally beneficial in simple and complex landscapes for total plant species richness. To maintain diversity within agricultural areas, it is also important to reduce farming intensity at the edges, which would favour characteristic arable weeds and margins’ overall plant diversity.
Lien pérenne : DOI : 10.1111/j.1365-2664.2010.01822.x
in Journal of applied ecology > 47 (4) (August 2010) . - 832-840Laura, J.M., Armengot, L., Blanco Moreno, J.M., Bassa, M., Sans, F.X. 2010. Effects of agricultural intensification on plant diversity in Mediterranean dryland cereal fields. Journal of applied ecology, 47(4): 832-840.
Organic farming enhances the recovery of ancient crops and segetal weeds in Catalonia (NE of Spain) / Lourdes Chamorro (2014)
est un extrait de Proceedings of the 4th ISOFAR Scientific Conference. ‘Building Organic Bridges’, at the Organic World Congress 2014, 13-15 Oct., Istanbul, Turkey (2014)
Titre : Organic farming enhances the recovery of ancient crops and segetal weeds in Catalonia (NE of Spain) Type de document : Extrait d'ouvrage Auteurs : Lourdes Chamorro, Auteur ; Laura Armengot, Auteur ; Laura José-María, Auteur ; Francesc Xavier Sans, Auteur Année de publication : 2014 Importance : 979-981 Langues : Anglais (eng) Catégories : [Thématique] Messicole Résumé : The Area of Natural Interest of Gallecs is nowadays one of the largest areas of arable land organically managed in Catalonia. In 2005 a project was launched to convert fields to organic farming and recuperate traditional crop varieties. The aim of this work is to analyse the changes in weed diversity, including both segetal and rare species, and of crops in 20 fields (ca. 46 ha) after the conversion to organic farming during 5 cropping periods (2005-2010). The number of cultivated crops increased from 1 to 17, including ancient and local varieties of cereal and legumes. Weed biodiversity at regional scale doubled in 5 years, whereas the presence of segetal and rare species increased by 75 % and 136 % respectively. Thus, organic farming contributes to the increase and the conservation of weed diversity in arable agroecosystems, including segetal species which are currently rare or have even disappeared from most of the conventional arable fields.Chamorro, L., Armengot, L., José-María, L., Sans, F.X. 2014. Organic farming enhances the recovery of ancient crops and segetal weeds in Catalonia (NE of Spain). In: Proceedings of the 4th ISOFAR Scientific Conference. ‘Building Organic Bridges’, at the Organic World Congress 2014, 13-15 Oct., Istanbul, Turkey. Rahmann G., [S.l.]: 979-981.The β-diversity of arable weed communities on organic and conventional cereal farms in two contrasting regions / Laura Armengot in Applied vegetation science, 15 (4) (October 2012)
Titre : The β-diversity of arable weed communities on organic and conventional cereal farms in two contrasting regions Type de document : Imprimé Auteurs : Laura Armengot ; Francesc Xavier Sans ; Christina Fischer ; Andreas Flohre ; Laura José-María ; Teja Tscharntke (1952-) ; Carsten Thies Année de publication : 2012 Article en page(s) : 571-579 Catégories : [Thématique] Messicole Lien pérenne : DOI : 10.1111/j.1654-109X.2012.01190.x
in Applied vegetation science > 15 (4) (October 2012) . - 571-579Armengot, L., Sans, F.X., Fischer, C., Flohre, A., José-María, L., Tscharntke, T., Thies, C. 2012. The β-diversity of arable weed communities on organic and conventional cereal farms in two contrasting regions. Applied vegetation science, 15(4): 571-579.