Abstract
Vocal communication is an important modality for group-living primates inhabiting dense forest habitats that can hinder visual and olfactory signals. Nevertheless, research on primate vocalizations has historically focused on a narrow subset of haplorhine taxa; comparatively few studies have been focused on strepsirrhines, despite facing similar ecological and social challenges. Ruffed lemurs (Varecia)—a taxon known for their raucous calls—are rainforest specialists that exhibit strong fission–fusion dynamics and communally rear large litters of young. However, surprisingly few studies have examined Varecia vocalizations in the wild, meaning virtually nothing is known about the call types or how they facilitate their unique social and reproductive strategies. Our goal for this study was to examine how various contextual factors such as weather, behavioral state, and subgroup size and composition affected vocal activity across call types in wild black-and-white ruffed lemurs. We conducted focal follows on 31 individuals (two communities) in Mangevo (Ranomafana National Park) from May–August 2019 to record behavioral and vocal activity. We distinguished 11 call types, although three (hum, roar-shriek, chatter) constituted the majority of vocal activity. Calling rates were consistent throughout the day, but decreased with high rainfall. We found sex- and subgroup-specific differences in call usage, likely related to female dominance and subgroup composition, respectively. We identified behavioral contexts that some call types were consistently given in; this can be used to help infer call function. This study provides some of the first quantitative analyses of ruffed lemur vocal communication and lays the groundwork for more systematic hypothesis testing in future studies.
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Data generated or analyzed during this study are available in the supplementary materials.
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Acknowledgements
We thank our local guide, Ezafy, and cook, Tolotra, without whom this project could not have been completed. We thank the Centre ValBio staff for their extensive logistical support. Ford, Noro, and the Mangevo field teams were great campmates and helpful with troubleshooting. MICET provided vital documentation facilitation and Madagascar National Parks provided research permits (#109). The research herein adheres to the American Society of Primatologists’ Principles for the Ethical Treatment of Primates and was approved by Hunter College’s Institutional Animal Care & Use Committee (IACUC; protocol: AB-RuffedLemur-2.22). CB had a scientific research visa from the US-Malagasy Embassy. This study was generously funded by the CUNY Graduate Center Provost’s Office.
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CHB and ALB conceived and designed the study. CHB, MR, and FR carried out data collection. CHB conducted data analysis. ALB and CHB drafted the manuscript, and all authors approved it.
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The authors declare no conflict of interest. The research herein adheres to the American Society of Primatologists’ Principles for the Ethical Treatment of Primates and was approved by Hunter College’s Institutional Animal Care & Use Committee (IACUC; protocol: AB-RuffedLemur-2.22).
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Batist, C.H., Razafindraibe, M.N., Randriamanantena, F. et al. Factors affecting call usage in wild black-and-white ruffed lemurs (Varecia variegata) at Mangevo, Ranomafana National Park. Primates 63, 79–91 (2022). https://doi.org/10.1007/s10329-021-00956-0
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DOI: https://doi.org/10.1007/s10329-021-00956-0