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Jeune docteur
Jean Wencelius
Produire de bonnes semences, Perpétuer le lignage. Relations de parenté et reproduction de la diversité des sorghos chez les Masa-Bugudum du Cameroun
Michael Houseman

Thesis entitled: Producing Good Sperm, Perpetuating Lineage. Kinship Relations and Reproduction of Diversity of Sorghos among the Masa-Bugudum in Cameroon.

Wencélius, J., M. Thomas, P. Barbillon et E. Garine, 2016, Interhousehold variability and its effects on seed circulation networks: a case study from northern Cameroon, Ecology and Society, 21 (1), en ligne : http://www.ecologyandsociety.org/vol21/iss1/art44/.
Coomes, O.T., S.J. McGuire, Éric Garine, S. Caillon, D. McKey, E. Demeulenaere, D. Jarvis, G. Aistara, A. Barnaud, P. Clouvel, L. Emperaire, S. Louafi, P. Martin, F. Massol, M. Pautasso, C. Violon et J. Wencélius, 2015, Farmer seed networks make a limited contribution to agriculture? Four common misconceptions, Food Policy, 56 : 41-50, en ligne : http://linkinghub.elsevier.com/retrieve/pii/S030691921500086X.
Wencélius, J. et Éric Garine, 2014, Dans les sillons de l’alliance. Ethnographie de la circulation des semences de sorgho dans l’Extrême-Nord du Cameroun, Les Cahiers d’Outre-Mer, 265 [Frontières des hommes, frontières des plantes cultivées: des territoires de l’agro-diversité] : 93-116, en ligne : http://com.revues.org/7082.
Saïdou, A.-A., C. Raimond, C. Soler, T.-V. Cao Hamadou, R. Kenga, L. Benoit, J. Wencélius, O. Fokou, C. Chauvin, S. Ekeke et H.I. Joly, 2014, Histoire d’une innovation agricole récente à l’échelle régionale : quelle différenciation des sorghos repiqués dans le bassin du lac Tchad ?, Les Cahiers d’Outre-Mer, 266 : 141-168, en ligne : http://journals.openedition.org/com/7140.
Le sorgho repiqué a fait l’objet d’une large diffusion dans le bassin du lac Tchad au XXe siècle. Cette culture présente une forte diversité variétale. Les nomenclatures paysannes suggèrent des groupes géographiquement distincts, subdivisés en variétés locales selon des critères qui peuvent varier en fonction des sociétés. À partir d’une taxonomie simplifiée en langue véhiculaire (fulfulde) et de la structure des diversités agro-morphologique et génétique du sorgho repiqué, nous montrons que la variation repose moins sur la définition de catégories taxonomiques intermédiaires (groupes variétaux) que sur celle, plus fine, de taxons terminaux en langues locales (types nommés). Cela est expliqué à l’échelle locale par les pratiques de sélection et de gestion variétale des agriculteurs. La proximité génétique des sorghos repiqués avec certaines populations de sorgho pluvial apporte de nouveaux éléments soutenant les hypothèses sur l’histoire évolutive des sorghos repiqués. L’association du sorgho repiqué à plusieurs clusters génétiques et plusieurs haplotypes chloroplastiques, la circulation régionale relativement récente ainsi que le statut de vivrier marchand du sorgho repiqué ne permettent pas de tracer des frontières géographiques ou culturelles dans la répartition actuelle du sorgho repiqué., A large expansion of dry season sorghum (transplanted sorghum) was noticed in the Lake Chad basin over the last century. A high level of landraces diversity is associated to this crop. We could identify geographical groups of dry season sorghum according to farmers’ nomenclatures; these groups are subdivided into local landraces according to criteria specific to each rural society. Following an ad hoc taxonomy and according to the structure of the agro-morphological variation and genetic diversity of dry season sorghum, we showed that diversity is mainly structured according to the terminal level of the taxonomy (landrace or cultivar). We explained this pattern as the effect of local practices of seed and field management by farmers. Dry season sorghum populations are genetically close to some populations of rainy sorghum; this supports the known hypotheses of dry season sorghum evolutive history. Dry season sorghum belongs to more than a single genetic cluster and exhibited many chloroplastic haplotypes; this is congruent with recent movement of seeds at the regional level and the use of dry season sorghum for both house consumption and markets. This does not allow for the delimitation of geographical and/or cultural boundaries for the use of given landraces of this crop.
Garine-Wichatitsky, M., E. Miguel, B. Mukamuri, Éric Garine Wichatitsky, J. Wencélius, D. Pfukenyi et A. Caron, 2013, Coexisting with wildlife in transfrontier conservation areas in Zimbabwe: Cattle owners’ awareness of disease risks and perceptions of the role played by wildlife, Comparative Immunology, Microbiology and Infectious Diseases, 36 (3) : 321-332, en ligne : http://linkinghub.elsevier.com/retrieve/pii/S014795711200121X.
Diseases transmitted between wildlife and livestock may have significant impacts on local farmers' health, livestock health and productivity, overall national economies, and conservation initiatives, such as Transfrontier Conservation Areas in Southern Africa. However, little is known on local farmers' awareness of the potential risks, and how they perceive the role played by wildlife in the epidemiology of these diseases. We investigated the knowledge base regarding livestock diseases of local cattle owners living at the periphery of conservation areas within the Great Limpopo TFCA and the Kavango-Zambezi TFCA in Zimbabwe, using free-listing and semi-structured questionnaires during dipping sessions. The results suggest that information related to cattle diseases circulates widely between cattle farmers, including between different socio-cultural groups, using English and vernacular languages. Most respondents had an accurate perception of the epidemiology of diseases affecting their livestock, and their perception of the potential role played by wildlife species was usually in agreement with current state of veterinary knowledge. However, we found significant variations in the cultural importance of livestock diseases between sites, and owners' perceptions were not directly related with the local abundance of wildlife. As the establishment of TFCAs will potentially increase the risk of Transboundary Animal Diseases, we recommend an increased participation of communities at a local level in the prioritisation of livestock diseases control and surveillance, including zoonoses.
Soler, C., A.-A. Saidou, T. Vi Cao Hamadou, M. Pautasso, J. Wencélius et H.H.I. Joly, 2013, Correspondence between genetic structure and farmers’ taxonomy – a case study from dry-season sorghum landraces in northern Cameroon, Plant Genetic Resources, 11 (1) : 36-49, en ligne : http://www.journals.cambridge.org/abstract_S1479262112000342.
Garine, E., V. Labeyrie, C. Violon, J. Wencélius, C. Leclerc et C. Raimond, 2018, Which scale to understand seed fluxes in small-scale farming societies? Snapshots of sorghum from Africa, The Commons, Plant Breeding and Agricultural Research: Challenges for Food Security and Agrobiodiversity (London, Routledge), en ligne : https://www.routledge.com/The-Commons-Plant-Breeding-and-Agricultural-Research-Challenges-for-Food/Girard-Frison/p/book/9781138087583.
Garine, E., K. Buissereth, J. Chambon, M. Essouci, G. Guillouet, I. Mancilla et J. Wencélius, 2018, Edible or disgusting ? Notes on the cultural value of birds among students in Paris (France 2011), Birds as Food: Anthropological and Cross-Disciplinary Perspectives (Enfield (UK), International Commission on the Anthropology of Food and Nutrition) : 57-80, en ligne : https://www.scribd.com/document/371269556/Birds-as-Food-ISBN-978-0-9500513-0-7.
Garine, I. de, C. Violon et J. Wencélius, 2017, Du coq à toutes les sauces : succession temporelle et spatiale des cycles rituels masa et tupuri (Extrême-Nord du Caméoun/Tchad), Rites et religions dans le bassin du lac Tchad (Paris, Karthala) : 185-208.
Thomas, M., N. Verzelen, P. Barbillon, O.T. Coomes, S. Caillon, D. McKey, M. Elias, E. Garine, C. Raimond, E. Dounias, D. Jarvis, J. Wencélius, C. Leclerc, V. Labeyrie, P.H. Cuong, N.T.N. Hue, B. Sthapit, R.B. Rana, A. Barnaud, C. Violon, L.M.A. Reyes, L.L. Moreno, P. De Santis et F. Massol, 2015, A Network-Based Method to Detect Patterns of Local Crop Biodiversity: Validation at the Species and Infra-Species Levels, Ecosystem Services: From Biodiversity to Society, Part I (Cambridge MA, Academic Press) : 259-320 [Advances in Ecological Research, 53], en ligne : http://www.sciencedirect.com/science/article/pii/S0065250415000318.
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 agro-ecological 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.
Garine, Éric, A. Luxereau, J. Wencélius, C. Violon, T. Robert, A. Barnaud, S. Caillon et C. Raimond, 2013, De qui les variétés traditionnelles de plantes cultivées pourraient-elles être le patrimoine ? Réflexions depuis le bassin du lac Tchad, Effervescence patrimoniale au Sud. Enjeux, questions, limites (Marseille, IRD Éditions) : 379-409.
Violon, C. et J. Wencélius, 2014, Les échanges monétaires en zone rurale dans le Mayo-Danay (Extrême-Nord du Cameroun) : lieux, acteurs et pratiques, Les échanges et la communication dans le bassin du lac Tchad: Actes du 15e colloque du réseau Méga-Tchad (Naples, 13-15 septembre) (Naples, Universita Degli Studi di Napoli "L’Orientale").
Wencélius, J., 2017, « Tell me where your wife comes from and I’ll tell you how you name your sorghum landraces! The social-shaping of sorghum diversity in Northern Cameroon », Invited talk to the Ethnobiology Seminars, Oxford University, London.
Guerbois, C., E. Andrieu, Éric Garine, A. Sourdril, J. Wencélius et M. Deconchat, 2017, « Bird stories to tell social and environmental changes: a comparative approach in four countries », The 2017 Resilience Conference, Stockholm, Sweden.
Garine Wichatitsky, M., L. Jomane, M. Tivapasi, M. Belgherbi, T. Hove, Éric Garine Wichatitsky, J. Wencélius, D. Pfukenyi, B. Mukamuri et A. Caron, 2015, « Indigenous and scientific knowledge regarding ticks and tick-borne diseases in wildlife-livestock interface areas in Zimbabwe », 14th International Symposium of Veterinary Epidemiology and Economics, Merida, Yucatan, Mexico.
Garine, Éric, C. Violon, J. Wencélius et M. Thomas, 2015, « "Lost in the Network". Afterthoughts of a social anthropologist on quantitative studies », journées MIRES/GDR-Mosaïque "Analyse des réseaux sociaux : Une manière d’allier approches qualitatives et quantitative ? Exemple de la circulation des semences", Paris.
Garine, Éric, C. Violon, J. Wencélius et M. Thomas, 2015, « "What happened to the plan ?" Social and ecological uncertainty in Northern Cameroon smallholder agriculture », ICREA International Conference on Small-Scale Societies and environmental transformations : co-evolutionary dynamics, Barcelona.
Wencélius, J., 2014, « Reproduire les semences des ancêtres: ruptures et continuites dans la production des richesses et des hommes chez les Masa du Cameroun », séminaire de la Société des Africanistes, Musée du quai Branly, Paris.
Wencélius, J., C. Violon, C. Raimond et Éric de Garine, 2014, « "What happened to the plan ?" Social and ecological uncertainty in Northern Cameroon smallholder agriculture », ICREA International Conference on "Small-scale societies and environmental transformations: co-evolutionary dynamics", Barcelona, Espagne.
Wencélius, J., M. Thomas, P. Barbillon et Éric Garine, 2014, « Seed exchange networks in Northern Cameroon: Who do we interview? », Session "Networking the Environment", First European Conference on Social Networks, Barcelona, Espagne.
Garine, Éric, J. Wencélius, Émilie Guitard et C. Raimond, 2013, « Perception des changements dans les plaines inondées de l’Extrême-Nord du Cameroun », atelier "Perceptions des changements par la biodiversité ordinaire", Labex Dynamite, Paris.
Wencélius, J., 2013, « Produire des semences, reproduire le lignage: la place des femmes dans une societe patrilineaire », rencontres doctorales du LESC, Université Paris Nanterre.
Garine, Éric, A. Luxereau, T. Robert, J. Wencélius, C. Raimond et A. Barnaud, 2013, « Biocultural diversity hypothesis : is it useful to understand the evolution of agrobiodiversity ? Snapshots from the Lake Chad Basin », 17th World Congress IUAES "Evolving Humanity, Emerging Worlds", University of Manchester.
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