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Polyspecific associations between squirrel monkeys (Saimiri sciureus) and other primates in eastern Amazonia.

Tatyana Pinheiro1, Stephen F Ferrari, Maria Aparecida Lopes

  • 1Institute of Biological Sciences, Universidade Federal do Pará, Belém-PA, Brazil. tatyanapinheiro@yahoo.com.br

American Journal of Primatology
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Summary

Polyspecific associations between squirrel monkeys (Saimiri) and capuchins (Cebus) were studied in the Brazilian Amazon. Findings reveal varied association patterns and niche overlap influenced by location and season.

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Area of Science:

  • Primatology
  • Behavioral Ecology
  • Amazonian Biodiversity

Background:

  • Polyspecific associations are common in Neotropical primates.
  • Squirrel monkeys (Saimiri) and capuchins (Cebus) frequently associate.
  • Understanding these interactions is key to primate community ecology.

Purpose of the Study:

  • To analyze association patterns between Saimiri sciureus and other primate species in eastern Brazilian Amazonia.
  • To investigate the degree of association, niche breadth, and niche overlap.
  • To determine how seasonal changes and location affect these interactions.

Main Methods:

  • Focused on two Saimiri sciureus groups (B4 and GI) near the Tucuruí reservoir.
  • Monitored associations and encounters within 50 meters and directional movement.
  • Analyzed species involved, association duration, niche breadth, and overlap.

Main Results:

  • Group B4 associated with Cebus apella 100% of the time and Chiropotes satanas 20.2%.
  • Group GI associated with Cebus 54.8% and Chiropotes utahickae 2.5%.
  • Saimiri exhibited broader niches than Cebus in vertical spacing and diet; niche overlap was higher at B4.

Conclusions:

  • Association patterns varied significantly between the two Saimiri groups and were influenced by season.
  • Niche overlap did not directly correlate with association rates, suggesting complex ecological dynamics.
  • Differences in ranging and foraging likely explain varying benefits of association for Saimiri.