Swamp forests of Pterocarpus officinalis (jacq.) form remarkable monodominant forest stands growing on temporarily or permanently flooded soils in mangrove hinterland areas, along rivers and in wet depressions in the mountains of the Caribbean and Guiana regions. In Guadeloupe, smallholder farmers traditionally cultivate flooded Taro (Colocasia esculenta (L.) Schott) monocultures under the canopy of P. officinalis stands in the swamp forests. Taro corms and unrolled leaves are commonly consumed in Guadeloupe. The understorey culture of Taro is conducted without pesticides and fertilizers, which could be partly due to the net input of nitrogen into the soil by P. officinalis through its ability to fix atmospheric nitrogen. Furthermore, the mycorrhizal networks could favor the transfer of fixed nitrogen from P. officinalis to the intercropped Taro. Taro cultivation is conducted during the dry season to facilitate their planting between mature Pterocarpus trees and their harvest when the marshy soils are dewatered. The sampling of roots and leaves on Taro and two cohorts of P. officinalis (mature trees and seedlings) were made during the dry season in two swamp forest sites located at Gosier (approx. 0.1 ha in area) and Belle-Plaine (approx. 0.5 ha in area) in the island of Grande-Terre, Guadeloupe. The arbuscular mycorrhizal (AM) fungal community was compared between Taro and two cohorts of Pterocarpus, by using pyrosequencing of partial 18S rDNA gene. We also compared natural abundance of 13C and 15N contents in leaves of the two cohorts of Pterocarpus, Taro and surrounding non-nitrogen-fixing plant species, in order to estimate what proportions of N and C were transferred to Taro. Of the 210,676 sequences, 37,631 sequences were assigned to a total of 215 OTUs belonging to the orders of Glomerales, Paraglomerales, Archeosporales and Diversisporales. A low AM fungal community membership was observed between P. officinalis and C. esculenta. However, certain AM fungal c