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The objective of this study was to understand the need for the preservation of lemurs (V. v. subcincta and E. albifrons) and to provide an updated inventory of the situation and evolution of the dense forest of Nosy Mangabe from 1997 to 2017. The data obtained will be used to strengthen conservation strategies for the lemur population. The study was carried out from January 27th to September 19th 2017 and from January 28th to September 22nd 2017 in the Nosy Mangabe service area. For estimation of the density and abundance of the two species, the line transect method was used. The results obtained in the service area show a density of 5.62 ind/ha for Eulemur albifrons and a density of 2.87 ind/ha for V. v. subcincta. In the core part, the results show a density of 3.62 ind/ha for E. albifrons and a density of 1.25 ind/ha for V. v. subcincta. Land cover conversion over a period of 20 years was mapped using multi-date images from the Landsat satellite. The unsupervised classification method was used using ArcGis 10.4.1 software. A few GPS points were recorded for each type of land use to validate the cartographic results. The results obtained indicate that the dense forest lost an area of 1.47 km² (26%) between the year 1997 and the year 2017. Cyclones and tourism policy are the main natural causes threatening conservation. The landscape of the site is in full transformation and dominated by dense degraded forest. [ABSTRACT FROM AUTHOR]