Geographic distribution and demography of Pithecia aequatorialis (Pitheciidae) in Peruvian Amazonia

Rolando Aquino, Fanny M. Cornejo, Etersit Pezo Lozano, Eckhard W. Heymann

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


To study the geographic distribution and demographic characteristics of Pithecia aequatorialis in Peruvian Amazonia, we undertook surveys and transect census in three river basins (Río Itaya, Río Tigre and Río 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 (Río Itaya: 7.8ind./km2, vs. 5.6 and 5.9 km2 in the Río Tigre and Río 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 Río Tigre and Río Corrientes, but exclude the area to the north between the Río Curaray and Río Napo. These findings are in contrast to previous distribution maps. P. aequatorialis was rarely seen in interspecific association during our censuses.
Original languageAmerican English
Pages (from-to)964-968
Number of pages5
JournalAmerican Journal of Primatology
Issue number12
StatePublished - 1 Jan 2009


  • Geographic distribution
  • Group composition
  • Group size
  • Interspecific association
  • Pithecia aequatorialis
  • Population density


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