Abstract
Tropical forests have a high diversity of tree species which have very low densities and vary across time in their seasons of peak fruiting and maturation rates. As evidence of the ability of primates to track or anticipate changes in fruit production at individual trees, researchers have used the increased speed of primate groups toward more rewarding food patches. We analyzed the speed of approach to natural trees of wild capuchin monkeys under the effect of scramble competition, after excluding any plausible visual, olfactory and auditory cues. We conducted all-day group follows of three habituated capuchin groups at Iguazú National Park, Argentina, collecting data on ranging behavior and patterns of visits to fruit trees in relation with their location and fruit availability. Travel speed varied according to the expected reward at a feeding tree, increasing as rewards increased from low values, but decreasing again at very high values. Also, travel speed varied with time of day, decreasing from the time of first activity as the monkeys became less hungry, and increasing again toward late afternoon. Measures of unripe fruit cover did not explain variation in travel speed at any distance from a focal tree. Our data imply that, after excluding sensory cues, capuchins appear to anticipate time-varying ripe fruit quantity of natural resources, suggesting that they use memory of tree location and anticipation of fruit maturation. We also confirm that speed is a good measure about expectations of resources, as has been shown in previous studies.
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Acknowledgements
We wish to thank Administración de Parques Nacionales and Centro de Investigaciones Ecológicas Subtropicales for granting permission to conduct this study. This work would not have been possible without field assistance from Alex Alcocer Aldunate, Ana Alvarez, María Celia Baldovino, María Verónica Cifre, Lara Coleselli, Emanuel Galetto, Juan Garibaldi, Luis Molina, Natalia Gomez de Oliveira, Elizabeth Gonzáles Valentín, Rocío Fernández Quintero, Daniel Lambruschi, Ricardo Melzew, Juan Pablo Peretti, Noelia Rivas, Taylor Rubin, Clara Scarry and Fermino Silva
Funding
This study was funded by a dissertation fellowship from the Argentine Research Council (CONICET) to M.P.T., as well as grants from Idea Wild and the American Society of Mammalogists (no grant numbers available).
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All applicable international, national and/or institutional guidelines for the care and use of animals were followed. All research reported in this manuscript adhered to the International Primatological Society and the American Society of Primatologists Principles for the Ethical treatment of Non-human Primates, and complied with the protocols approved by the Animal Care and Use Committee and the Argentine Research Council (CONICET). It also adhered to the legal requirements of Argentina.
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Tujague, M.P., Janson, C.H. Wild capuchin monkeys anticipate the amount of ripe fruit in natural trees. Anim Cogn 20, 841–853 (2017). https://doi.org/10.1007/s10071-017-1105-7
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DOI: https://doi.org/10.1007/s10071-017-1105-7