Abstract: Demographic data were obtained on one group of muriquis (Brachyteles arachnoides) over an 8‐year period at Fazenda Montes Claros, Minas Gerais, Brazil. During this period, the group rapidly increased in size, growing from 22 to 43 individuals due to 21 births. Eight disappearances or emigrations were offset by eight immigrations. The group also maintained a stable age‐sex class distribution. Inter‐birth intervals averaged 33.8 months, and age at first reproduction was 71/2% years, or 2.7 interbirth intervals. The high birth rate and low mortality rate, along with increased group fissioning and increased home range size, indicate that this group of muriquis is in a stage of expansion. These demographic data also suggest that some small populations of endangered primates can expand in well‐protected babitats without apparent signs of overcrowding or deleterious effects of close inbreeding. These data, as well as the documentation of female migration and male philopatry, provide important guidelines for future management plans for this species.
Conservation Biology – Wiley
Published: Jun 1, 1991
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