Journal
AMERICAN JOURNAL OF PRIMATOLOGY
Volume 71, Issue 12, Pages 964-968Publisher
WILEY
DOI: 10.1002/ajp.20738
Keywords
Pithecia aequatorialis; geographic distribution; group composition; group size; population density; interspecific association
Categories
Funding
- Amazon Center for Environment Education and Research (ACEER)
- Consejo Superior de Investigaciones of the Universidad Nacional Mayor de San Marcos
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To study the geographic distribution and demographic characteristics of Pithecia aequatorialis in Peruvian Amazonia, we undertook surveys and transect census in three river basins (Rio Itaya, Rio Tigre and Rio Curaray) between 2004 and 2008. A total of 123 groups of P. aequatorialis was encountered during 1623 km of transect walks. Group size was uniform among the three areas (3.4-3.6 individuals), but surprisingly, population densities were higher in the area with strong hunting pressure (Rio Itaya: 7.8 ind./km(2), vs. 5.6 and 5.9 km(2) in the Rio Tigre and Rio Curaray basins, respectively). The most common group composition included an adult pair with one offspring. Groups with more than one adult male and/or female accounted for 35% of sightings. Our observations extend P. aequatorialis range in Peru further south to the area between the Rio Tigre and Rio Corrientes, but exclude the area to the north between the Rio Curaray and Rio Napo. These findings are in contrast to previous distribution maps. P. aequatorialis was rarely seen in interspecific association during our censuses. Am. J. Primatol. 71:964-968, 2009. (C) 2009 Wiley-Liss, Inc.
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