Abstract
Mantled howler monkeys (Alouatta palliata) occupy a wide variety of tropical habitats and are the most folivorous of New World primates. However, their diet may include fruits, buds, petioles, and flowers, as well as leaves, suggesting they must cope with variations in the nutrient composition of their food. We studied the physiological basis of the dietary flexibility of these monkeys by comparing food choice, digestive performance and patterns of digesta flow in six adults, fed diets of either leaves or a mixture of fruit and leaves. Although monkeys ate similar amounts of the two diets, they ingested more digestible protein when offered the leaf diet, on which they lost body mass, but they ingested much more soluble sugars when offered fruit and leaves on which they gained mass. Digestibilities of dry matter, fat, energy and fibre did not differ between diets, but those of crude protein, soluble sugars and minerals were higher on the fruit–leaf diet. Mean retention times in the gut of solute (Co-EDTA) and particulate markers (Cr-mordanted cell walls) did not differ between diets, but on both diets the monkeys retained the particulate marker (mean retention time ca 55 h) for longer than they did the solute marker (MRT ca 50 h). A lack of selective retention of solutes and small particles in the gastro-intestinal tract of howler monkeys probably restricts them to mixed diets but their digestive strategy is sufficiently flexible to allow them to feed on a diet of leaves when fruit is unavailable.
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Abbreviations
- DM:
-
Dry matter
- WM:
-
Wet matter
- OM:
-
Organic matter
- CT:
-
Condensed tannins
- DEI:
-
Digestible energy intake
- N:
-
Nitrogen
- NDF:
-
Neutral detergent fibre
- ADF:
-
Acid detergent fibre
- SS:
-
Soluble sugars
- MRT:
-
Mean retention time
- TT:
-
Transit time
- SRI:
-
Selective retention index
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Acknowledgments
This research was funded by CONACYT-FOMIX 109499 “Capacidad de detoxificación y estrategias digestivas en Ateles geoffroyi y Alouatta palliata”. FEG was supported by CONACYT Scholarship 171093. We especially appreciate the work and dedication of the field assistants: Gildardo Castañeda, Antonio Jauregui, Rubén Mateo y Denedi García. We thank the Instituto de Neuroetología of Universidad Veracuzana and Centro Nacional de Investigación Disciplinaria en Fisiología y Mejoramiento Animal of INIFAP for all facilities granted. This article benefited from insightful comments and suggestions by Professor Ian Hume who read and commented on earlier versions of this article.
Ethical standards
This work complies with the current laws of Mexico. The monkeys were captured under the guidelines of the IUCN (1998) and the Mexican authority for the “Translocation of Mexican howler monkey program” by the Universidad Veracruzana (General Management of Wildlife SGPA/DGVS/02315/07) and held under the legal and ethical requirements of the Mexican Government (Official Journal of the Federation, 1999).
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Communicated by I.D. Hume.
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Espinosa-Gómez, F., Gómez-Rosales, S., Wallis, I.R. et al. Digestive strategies and food choice in mantled howler monkeys Alouatta palliata mexicana: bases of their dietary flexibility. J Comp Physiol B 183, 1089–1100 (2013). https://doi.org/10.1007/s00360-013-0769-9
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DOI: https://doi.org/10.1007/s00360-013-0769-9