McGrosky, Amanda, Meloro, Carlo, Navarrete, Ana, Heldstab, Sandra A, Kitchener, Andrew C, Isler, Karen and Clauss, Marcus (2019) Gross intestinal morphometry and allometry in primates (e23035). American Journal of Primatology, 81 (8). ISSN 1098-2345

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Although it is generally assumed that among mammals and within mammal groups, those species that rely on diets consisting of greater amounts of plant fiber have larger gastrointestinal tracts (GIT), statistical evidence for this simple claim is largely lacking. We compiled a dataset on the length of the small intestine, caecum, and colon in 42 strepsirrhine, platyrrhine, and catarrhine primate species, using specimens with known body mass (BM). We tested the scaling of intestine length with BM, and whether dietary proxies (percentage of leaves and a diet quality index) were significant covariates in these scaling relationships, using two sets of models: one that did not account for the phylogenetic structure of the data, and one that did. Intestine length mainly scaled geometrically at exponents that included 0.33 in the confidence interval; Strepsirrhini exhibited particularly long caeca, while those of Catarrhini were comparatively short. Diet proxies were only significant for the colon and the total large intestine (but not for the small intestine or the caecum), and only in conventional statistics (but not when accounting for phylogeny), indicating the pattern occurred across but not within clades. Compared to terrestrial Carnivora, primates have similar small intestine lengths, but longer large intestines. The data on intestine lengths presented here corroborate recent results on GIT complexity, suggesting that diet, as currently described, does not exhaustively explain GIT anatomy within primate clades.

Item Type: Article
Uncontrolled Keywords: anatomy; diet; digestive tract; phylogeny; primate
Subjects: A General Works > AM Museums (General). Collectors and collecting (General)
A General Works > AS Academies and learned societies (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QL Zoology
Theme: Understanding the natural world
Department: Natural Sciences
Funders: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung. Grant Number: 3100A0‐117789, A.H. Schultz‐Stiftung zur Förderung Primatologischer Forschung, European Integrated Activities grant SYNTHESYSSYNTHESYS. Grant Number: HU‐TAF‐4916
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Depositing User: Ross Anderson
Date Deposited: 03 Oct 2019 13:56
Last Modified: 03 Oct 2019 13:56

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