Use of Mineral Licks by White-Bellied Spider Monkeys (Ateles belzebuth) and Red Howler Monkeys (Alouatta seniculus) in Eastern Ecuador
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Geophagy occurs in all primate groups and is particularly common in species that consume greater quantities of plant material, i.e., leaves, fruit. The function of geophagy is not fully understood and likely varies over space and time, perhaps in connection with changes in diet. Central to a better understanding of geophagy in primate ecology is knowledge of the occurrence of such behavior among different species and seasons. We used camera traps triggered by heat and motion to document the use of mineral licks by primates over a 3-yr period at a lowland forest site in eastern Ecuador (Tiputini Biodiversity Station). Such mineral licks can be important sources of minerals, nutrients, and other compounds for a wide range of species in Amazonian forests. Although 10 species of primates are known from the study site, we obtained photographs of only 2 species, Ateles belzebuth (white-bellied spider monkey) and Alouatta seniculus (red howler) at 2 of 4 saladeros surveyed. From late December 2004 through early January 2008, we recorded 192 photographs with a total of 318 Ateles belzebuth representing ≥66 separate visits. Comparable numbers for Alouatta seniculus were 80, 121, and 37. We recorded both species visiting a mineral lick at the same time on ≥7 occasions. Use of mineral licks varied across months; we recorded more visits from November through February, the drier period at Tiputini. Visits also varied by hour, with no visits before 0830 or after 1630; Ateles belzebuth showed a stronger mid-day peak in visits. Average visit length (calculated as the time between the first and last photographs of a given visit) was similar between the 2 species but median visit length was more than twice as long for Ateles belzebuth (15 min) as for Alouatta seniculus (6 min). Results indicate that mineral licks are important in the ecology of these species, but further studies are needed to determine the precise benefit(s) obtained and how benefits may vary with diet and other factors.
KeywordsAlouatta Ateles camera trap Ecuador geophagy mineral lick
We thank the many staff and volunteers who helped check the cameras, particularly Franklin Narvaez, Ramiro San Miguel, and Jose Macanilla. We especially thank Anthony Di Fiore for comments that greatly improved an earlier version of this manuscript and for sharing his knowledge about primates at Tiputini and elsewhere in Amazonia. Two anonymous reviewers also made many helpful suggestions. We also appreciate the help of Consuelo de Romo in facilitating our work at Tiputini and the many staff who help make working there such a pleasure. Support for this study was provided by National Geographic Society (7602-04), Universidad San Francisco de Quito, Tiputini Biodiversity Station, and University of Missouri—St. Louis. We thank Gary Kohout, Snapshot Sniper, LLC, for his help in maintaining the digital cameras.
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