Réserve spéciale de Mangerivola: An Essential Wildlife Reserve within the Atsinanana Protected Landscape Corridor

Mangerivola is best known for its exceptionally rich assemblage of lemurs within a relatively compact rainforest block, including the indri, sifaka, ruffed lemur, brown lemur, red-bellied lemur, grey bamboo lemur, and aye-aye. It is also recognized as an important refuge for rare forest birds, particularly the Soumagne's owl and the Madagascar serpent eagle. The combination of lowland and mid-altitude humid forest with rupicolous vegetation gives the reserve a layered ecological character.

The Mangerivola Special Reserve was established on 28 October 1958 under decree 58-10, one of the foundational instruments that shaped Madagascar's modern protected-area network. From its creation, it was integrated into the national system of strict nature reserves, national parks, and special reserves that together protect representative samples of the country's ecosystems. The reserve has since been managed under the Madagascar National Parks umbrella, the public institution responsible for the country's network of national parks and reserves. Its administrative link to the Zahamena Strict Nature Reserve reflects an effort to manage connected forest landscapes as coherent ecological units rather than as isolated fragments.

The landscape of Mangerivola is defined by the rugged relief of eastern Madagascar inland of the central-eastern coast. The reserve lies in a region with poor road access, contributing to a sense of remoteness and continuity with surrounding forest landscapes. The terrain supports both lowland dense humid forest on more accessible slopes and mid-altitude humid forest on elevated ground. Rocky outcrops scattered through the forest give rise to rupicolous vegetation, a visible physical and ecological signature of the reserve. Because much of the reserve must be reached on foot from the nearest roadhead at Anjahamana, the landscape retains an unbroken forest character between the approach trail and the interior.

Ecologically, the Mangerivola Special Reserve belongs to the eastern humid bioclimatic zone of Madagascar, one of the wettest and most biologically productive biomes on the island. The reserve's vegetation is dominated by humid dense forest at low and mid elevations, with rupicolous plant communities occupying rock faces and shallow-soil rocky habitats. This combination produces a habitat mosaic typical of the eastern escarpment, where continuous forest cover is interrupted by geological exposures. The reserve's ecological value lies in the persistence of this forest mosaic under a strict-protection regime, allowing natural successional and disturbance processes to unfold with limited human interference.

Mangerivola is a significant site for Malagasy primate conservation, supporting seven lemur species within a relatively small area. These include the indri, the diademed sifaka and other Propithecus sifakas, the black-and-white ruffed lemur, the brown lemur, the red-bellied lemur, the grey bamboo lemur, and the aye-aye. Such a concentration of lemur species in a single reserve is ecologically important given that most Malagasy lemurs are restricted to shrinking eastern rainforest fragments.

The reserve's birdlife adds further weight to its conservation profile. Roughly one hundred bird species have been recorded, including the Soumagne's owl, one of the rarest owls in the world and a species of major international conservation concern, and the Madagascar serpent eagle, a rare forest-dwelling raptor. Reptile diversity is also notable, with nineteen recorded reptile species. Together, these groups give Mangerivola a varied and strictly forest-dependent fauna, with limited tolerance for habitat conversion.

As a Special Reserve classified under IUCN Category IV, Mangerivola receives a protection regime focused on the conservation of specific habitats and species through managed intervention. It is part of the network originally established by decree 58-10 of 28 October 1958, which laid the foundation for Madagascar's protected-area system. Today the reserve is administered by Madagascar National Parks, the public body responsible for managing the country's national parks and special reserves.

Its administrative inclusion within the Zahamena Strict Nature Reserve network gives Mangerivola a broader conservation role, functioning as a buffer or complementary block within a larger landscape of strict protection. This integration is particularly important for wide-ranging forest species such as the indri and the Soumagne's owl, which depend on large, contiguous forest tracts. The reserve's isolation and restricted access further support its conservation role, providing a relatively undisturbed refuge in a region under significant land-use pressure.

Mangerivola's strongest highlights are ecological rather than infrastructural. The reserve is notable for supporting seven lemur species, including the indri, sifaka, ruffed lemur, red-bellied lemur, grey bamboo lemur, and aye-aye, all within a relatively compact forest block. It is also an important site for rare forest raptors and owls, particularly the Soumagne's owl and the Madagascar serpent eagle. Its integration with the Zahamena Strict Nature Reserve adds landscape-level significance, linking Mangerivola to a wider eastern Malagasy forest conservation corridor.