Through the studies of Bodmer (1994), Bodmer et al. (1997) and Hurtado-Gonzales and Bodmer (2004) we have known of Mazama nemorivaga populations that inhabit the margins of Yavari Miri and Tahuayo rivers, northeastern Peru. Apparently, these populations are not isolated from each other, as stated by Novaro et al. (2000).
In this region, the Amazonian brown brocket has considerably lower population densities than the red brocket. The density of the former is around 0.43-0.55 individuals per km² and its biomass estimates range from 6.5-8.2 kg/km². In contrast, red brocket deer usually have densities around 1.0 individuals per km² and a biomass of around 33 kg/km² (Salovaara et al. 2003).

Populations of Amazonian brown brocket were also reported in Suriname (Branan et al. 1985); in the Reserva Florestal Imataca, northeast of the state of Bolívar, Venezuela (Bisbal 1994); and in French Guiana (Gayot et al. 2004). Other populations of this deer are certainly present in many reserves or even private areas with well preserved forests. But the extant to which they are isolated from each other is unknown, due to the lack of knowledge on how this species responds to altered and fragmented habitats.

Decreasing