期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 52, 页码 21277-21282出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1215782109
关键词
C3 photosynthesis; feeding ecology; great apes; Uganda
资金
- New York Consortium in Evolutionary Primatology (NYCEP)
- National Science Foundation (NSF) [DGE 0333415]
- NSF [0922709]
- Engel Family Foundation
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0922709] Funding Source: National Science Foundation
We use stable isotope ratios in feces of wild mountain gorillas (Gorilla beringei) to test the hypothesis that diet shifts within a single year, as measured by dry mass intake, can be recovered. Isotopic separation of staple foods indicates that intraannual changes in the isotopic composition of feces reflect shifts in diet. Fruits are isotopically distinct compared with other staple foods, and peaks in fecal delta C-13 values are interpreted as periods of increased fruit feeding. Bayesian mixing model results demonstrate that, although the timing of these diet shifts match observational data, the modeled increase in proportional fruit feeding does not capture the full shift. Variation in the isotopic and nutritional composition of gorilla foods is largely independent, highlighting the difficulty for estimating nutritional intake with stable isotopes. Our results demonstrate the potential value of fecal sampling for quantifying short-term, intraindividual dietary variability in primates and other animals with high temporal resolution even when the diet is composed of C-3 plants.
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