Description de nouvelles formes d’humus en forêt tropicale sèche semi-décidue (nord Grande-Terre, Guadeloupe)

International audienc

Influence de la qualité chimique de la litière sur sa vitesse de décomposition

International audienc

Alternatives biologiques à l’usage des pesticides dans les plantations de bananes plantains (APR 2009).

International audienc

Évaluation du potentiel insecticide d’une sélection d’usages ethnopharmacologiques TRAMIL

International audienc

Soil biodiversity and ecosystem services in various agroecosystems of Guadeloupe (French West Indies)

International audienceThe soil is a complex living environment hosting a huge biodiversity. Soil organisms play a major role in the maintenance of ecosystem services. These ecosystem services (recycling of soil organic matter, soil maintenance, food supply, disease and climate regulations), are the benefits that human get from ecosystems and especially from biodiversity. Agriculture is vital for human activity, because it is an irreplaceable source of food. However, intensive agriculture has a negative impact on some ecosystem services. Thereby, agro-ecological practices are recommended for preservation and the restoration of biodiversity in the soil. A study is being carried out on the territory of Guadeloupe. The aims of this study are the following: i) To measure the impact of agricultural practices (intensive versus agro-ecological) on soil biodiversity and ecosystem keys services in market-gardening agrosystems of Guadeloupe. (ii) To test the impact of several agro-ecological practices based on the restoration of soil biodiversity on soil ecosystem services. These researches will allow us to highlight the existing interactions between soil biodiversity and environmental performance in a tropical environment.We analyzed 49 plots, representing the regional diversity of market-gardening in Guadeloupe (tomatoes, cucumbers, watermelons…). For each plot, a survey was conducted and allowed us to highlight the agricultural practices. At the end of these investigations, a principal component analysis and a hierarchical ascending classification was effected to highlight a typology of systems of cultures throughout the territory. This typology allowed a better understanding of the diversity of production systems (tillage, phytosanitary treatment, organic input, combined crops). This analysis highlighted a predominance of market-gardening systems in Grande-Terre (west part of Guadeloupe); these systems are developed under vertisols. In addition, a more in-depth study on macrofauna, chemical and microbiological analyses are in progress 5 agroecological plots and 5 conventional plots

Effects of TRAMIL’s insecticidal plants uses against the leaf-cutting ant, Acromyrmex octospinosus (Reich) (Hymenoptera: Formicidae).

International audienc

Leaf-Cutting Ants, Biology and Control

International audienc

Sites and species contribution to the β-diversity of Odonata assemblages in Haiti: Implications for conservation

International audienc

Spatial occupancy, local abundance and activity rhythm of three ground dwelling columbid species in the forests of Guadeloupe in relation to environmental factors.

18 pagesInternational audienceAlthough forest-dependent, tropical island endemic birds are particularly at risk of extinction, they remain largely understudied. In this context, we assessed the spatial occupancy, local abundance, and diel activity in three forest columbid species of hunting interest, the Ruddy Quail-Dove (RQD), Geotrygon montana; the Bridled Quail-Dove (BQD), Geotrygon mystacea; and the Zenaida Dove (ZD), Zenaida aurita, in Guadeloupe (French West Indies), using 5 camera-traps over 14 days on 24 survey stations, resulting in 1680 trap days. The number of observed RQD was too small to allow for a statistical comparison between habitats. BQD were more frequently observed at camera-trap stations that were dominated by tropical rainforest than those that were dominated by flooded forest. Conversely, ZD were more frequently observed at stations that were dominated by flooded forest and dry forest than at those that were dominated by tropical rainforest. High temperatures negatively affected the abundance of BQD, while the abundance of ZD was significantly lower in tropical rainforests compared to dry and flooded forests and tended to increase with canopy openness. The three species were diurnal. BQD significantly positively co-occurred spatially and temporally with small Indian mongooses, Urva auropunctata, whereas the temporal and spatial distribution of ZD overlapped significantly with that of domestic dogs, Canis familiaris, and domestic cats, Felis catus. Our results provide firm evidence that RQD remains scarce and is largely outnumbered by BQD in Guadeloupe which is in contrast with has been reported for other Caribbean islands