Evidence for a Tradeoff Between Retention Time and Chewing Efficiency in Large Mammalian Herbivores

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Evidence for a Tradeoff Between Retention Time and Chewing Efficiency in Large Mammalian Herbivores

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Title: Evidence for a Tradeoff Between Retention Time and Chewing Efficiency in Large Mammalian Herbivores
Author: Nunn, Charles Lindsay; Clauss, Marcus; Fritz, Julia; Hummel, Jürgen

Note: Order does not necessarily reflect citation order of authors.

Citation: Clauss, Marcus, Charles Lindsay Nunn, Julia Fritz, Jürgen Hummel. 2009. Evidence for a tradeoff between retention time and chewing efficiency in large mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology 154(3): 376-382.
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Abstract: Large body size is thought to produce a digestive advantage through different scaling effects of gut capacity and food intake, with supposedly longer digesta retention times in larger animals. However, empirical tests of this framework have remained equivocal, which we hypothesize is because previous comparative studies have not included digesta particle size. Larger particles require more time for digestion, and if digesta particle size increases with body mass, it could explain the lack of digestive advantage in larger herbivores. We combine data on body mass, food intake, digesta retention and digestibility with data on faecal particle size (as a proxy for digesta particle size) in 21 mammalian herbivore species. Multiple regression shows that fibre digestibility is independent of body mass but dependent on digesta retention and particle size; the resulting equation indicates that retention time and particle size can compensate for each other. Similarly, digestible food intake is independent of body mass, but dependent on food intake, digesta retention, and particle size. For mammalian herbivores, increasing digesta retention and decreasing digesta particle size are viable strategies to enhance digestive performance and energy intake. Because the strategy of increased digesta retention is usually linked to reduced food intake, the high selective pressure to evolve a more efficient dentition or a physiological particle separation mechanism that facilitates repeated mastication of digesta (rumination) becomes understandable.
Published Version: doi:10.1016/j.cbpa.2009.07.016
Other Sources: http://www.people.fas.harvard.edu/~nunn/PDFs/Clauss_et_al.2009.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:4318028

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  • FAS Scholarly Articles [8255]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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