Thomas M. auteur aut IRD Verzelen N. auteur aut IRD Barbillon P. auteur aut IRD Coomes O. T. auteur aut IRD Caillon S. auteur aut IRD McKey D. auteur aut IRD Elias M. auteur aut IRD Garine E. auteur aut IRD Raimond C. auteur aut IRD Dounias Edmond auteur aut IRD Jarvis D. auteur aut IRD Wencelius J. auteur aut IRD Leclerc C. auteur aut IRD Labeyrie V. auteur aut IRD Cuong P. H. auteur aut IRD Hue N. T. N. auteur aut IRD Sthapit B. auteur aut IRD Rana R. B. auteur aut IRD Barnaud Adeline auteur aut IRD Violon C. auteur aut IRD Reyes L. M. A. auteur aut IRD Moreno L. L. auteur aut IRD De Santis P. auteur aut IRD Massol F. auteur aut IRD text journalArticle eng text/pdf born digital access In this chapter, we develop new indicators and statistical tests to characterize patterns of crop diversity at local scales to better understand interactions between ecological and socio-cultural functions of agroecosystems. Farms, where a large number of crops (species or landraces) is grown, are known to contribute a large part of the locally available diversity of both rare and common crops but the role of farms with low diversity remains little understood: do they grow only common varieties-following a nestedness pattern typical of mutualistic networks in ecology-or do 'crop-poor' farmers also grow rare varieties? This question is pivotal in ongoing efforts to assess the local-scale contribution of small farms to global agrobiodiversity. We develop new network-based approaches to characterize the distribution of local crop diversity (species and infra-species) at the village level and to validate these approaches using meta-datasets from 10 countries. Our results highlight the sources of heterogeneity in crop diversity at the village level. We often identify two or more groups of farms based on their different levels of diversity. In some datasets, 'crop-poor' farms significantly contribute to the local crop diversity. Generally, we find that the distribution of crop diversity is more heterogeneous at the species than at the infra-species level. This analysis reveals the absence of a general pattern of crop diversity distribution, suggesting strong dependence on local agroecological and socio-cultural contexts. These different patterns of crop diversity distribution reflect an heterogeneity in farmers' self-organized action in cultivating and maintaining local crop diversity, which ensures the adaptability of agroecosystems to global change. specialized PRESENCE-ABSENCE MATRICES NATURAL PEST-CONTROL IN-HOME GARDENS AGRICULTURAL BIODIVERSITY MUTUALISTIC NETWORKS MANIHOT-ESCULENTA GENETIC-RESOURCES ON-FARM DIVERSITY SYSTEMS KENYA CAMEROUN PEROU VANUATU EQUATEUR NEPAL VIET NAM MEXIQUE HONGRIE GUYANA 076 Woodward G. ed. edt IRD Bohan D.A.G. ed. edt IRD 53 259-320 2015 https://www.documentation.ird.fr/hor/fdi:010066925 10.1016/bs.aecr.2015.10.002 978-0-12-803885-7 [F B010066925] https://www.documentation.ird.fr/hor/fdi:010066925 https://www.documentation.ird.fr/intranet/publi/2016/06/010066925.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2016-06-29 2017-08-23 fdi:010066925 fre