Réponse des nématodes à la perturbation des forêts dans la région d\'Oumé, Côte d\'Ivoire.

La sensibilité des nématodes aux perturbations des forêts a été étudiée à l\'échelle du paysage dans la région d\'Oumé. L\'échantillonnage a été réalisé le long d\'un gradient de perturbations du milieu, partant des forêts vers le domaine rural, en raison de six répétitions par habitat. Les résultats ont montré que les nématodes libres représentent 68 % du peuplement de nématodes. Neuf genres de nématodes phytoparasites (Criconemella, Helicotylenchus, Heterodera, Hoplolaimus, Meloidogyne, Pratylenchus, Radopholus, Rotylenchulus et Xiphinema) ont été identifiés. Parmi ces nématodes, Rotylenchulus sp et Xiphinema sp peuvent être considérés comme bioindicateurs à cause de la tendance à la réduction de leurs populations le long du gradient d\'utilisation de sol. (r = -0,74 ; P = 0,03 et r = -0,77 ; P = 0,03).The sensitivity of nematode communities to forest perturbations has been studied in the region of Oumé at the landscape level. Six samples were collected along a gradient of perturbations from forests to lands crops areas. The results showed that the free-living nematodes accounted for 68 % of the nematode community. The plant-parasitic nematode community was composed by nine genera (Criconemella, Helicotylenchus, Heterodera, Hoplolaimus, Meloidogyne, Pratylenchus, Radopholus, Rotylenchulus and Xiphinema). Rotylenchulus sp and Xiphinema sp are likely to be considered as bio-indicators of forest degradation as their populations are significantly reduced along the gradient of land use change (r = -0.74, P = 0.03 and r = -0.77, P = 0.03). Keywords: bioindicateur, diversité, indice d'utilisation de sol, nématodes, paysage./bio-indicator, diversity, land use index, landscape, nematodes.Sciences & Nature Vol. 4 (2) 2007: pp. 189-19

Stakeholder collaboration in climate-smart agricultural production innovations: insights from the Cocoa industry in Ghana

Although collaboration is vital in addressing global environmental sustainability challenges, research understanding on stakeholder engagement in climate-smart production innovation adoption and implementation, remains limited. In this paper, we advance knowledge about stakeholder collaboration by examining the roles played by stakeholders in scaling up ecological sustainability innovations. Using the illustrative context and case of green cocoa industry in Ghana, the analysis identified three distinctive phases of stakeholder engagement in ecological sustainability innovations implemented from 1960-2017. We highlight defining periods of ecological challenges encompassing the production recovery sustainability initiative phase solely driven by the Ghana Cocoa Board (COCOBOD)–a governmental body responsible for production, processing and marketing of cocoa, coffee and sheanut. During the period, major initiatives were driven by non-governmental organisations in collaboration with COCOBOD to implement the Climate-Smart agriculture scheme in the cocoa sector. The findings have implications for cocoa production research and stakeholder collaboration in environmental innovations adoption