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Sleeping site preferences in Sapajus cay Illiger 1815 (Primates: Cebidae) in a disturbed fragment of the Upper Paraná Atlantic Forest, Rancho Laguna Blanca, Eastern Paraguay

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Abstract

Wild primates can spend up to half of their lives sleeping, during which time they are subjected to many of the same selective pressures that they face when awake. Choosing an appropriate sleeping site can thus have important fitness consequences. We examined the sleeping site preferences of wild hooded capuchins (Sapajus cay) in a small degraded fragment of the Upper Paraná Atlantic Forest at Rancho Laguna Blanca (RLB) in eastern Paraguay. Sleeping trees and sites were identified during 5 months of field observations and their physical characteristics were compared to those of non-sleeping trees and sites. Capuchins preferred larger emergent trees with more main and forked branches, no lianas and denser undergrowth directly below. These were found in sites of more mature forest with fewer small trees, less liana coverage and denser undergrowth but more fruiting trees. The species composition of the sleeping sites differed from that of the non-sleeping sites and was dominated by Albizia niopoides (Mimosaceae) as well as Peltophorum dubium (Fabaceae) and Anadenanthera colubrina (Fabaceae). The capuchins were found to sleep most often in these three tree species: 69.23% in Albizia niopoides (Mimosaceae), 11.54% in Peltophorum dubium (Fabaceae) and 11.54% in Anadenanthera colubrina (Fabaceae). We found evidence for the predator avoidance, thermoregulatory, social contact and feeding site proximity hypotheses. We found no support for parasite avoidance, given the reuse of sites, although the small size of the forest fragment may have restricted this. Their preference for older-growth forest suggests that selective logging impacts hooded capuchins. However, their persistence in a disturbed fragment shows they are highly adaptable, providing support for the value of conservation and reforestation of even small fragments of the Paraguayan Upper Paraná Atlantic Forest.

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Acknowledgements

Many thanks to Jorge Damian Ayala Santacruz for assistance with tree identification and measurements. Thanks to Associate Professor Michael Schwarz (Flinders University) and Professor David Lusseau (University of Aberdeen) for their advice on statistical analysis. We are grateful to all the Fundación Para La Tierra volunteers who assisted with site measurements. We are grateful to Susan Smith, Emily Briggs and Anna O’Riordan for helpful comments on earlier drafts of this paper and to Dr. Jose Rimoli and Dr. Maria Celia Baldovino for their extremely helpful advice. We thank the estate of Don Julio Contreras for their unfailing support of Fundación Para La Tierra.

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Correspondence to Rebecca L. Smith.

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Our research was approved by the Secretaria del Ambiente and complied with all local laws. The study was noninvasive and followed the American Society of Primatology Code of Best Practices for Field Primatology (2014).

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Smith, R.L., Hayes, S.E., Smith, P. et al. Sleeping site preferences in Sapajus cay Illiger 1815 (Primates: Cebidae) in a disturbed fragment of the Upper Paraná Atlantic Forest, Rancho Laguna Blanca, Eastern Paraguay. Primates 59, 79–88 (2018). https://doi.org/10.1007/s10329-017-0626-7

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