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Stable isotope ecology of black rhinos (Diceros bicornis) in Kenya. | LitMetric
Stable isotope and elemental ratios in hair are influenced by the environment, including both climate and geology. Stable carbon isotopes can be used to give estimates of the C/CAM fraction of diets of herbivorous mammals; stable nitrogen isotopes are related to the local water deficit; strontium isotopes are determined by the local geology. We studied hair from rhinos in Kenya to determine spatial patterns in δC, δN, and Sr/Sr ratios. The samples of rhino hair were collected during Kenya Wildlife Service translocation or veterinary activities. δC values showed diets dominated by C foods, but in some regions the diet, at least seasonally, contained significant quantities (i.e., > ca. 20%) of C/CAM foods. δN values were related to water deficit, with higher δN values in regions with high water deficit. Sr/Sr isotope ratios were found to be related to the local geological substrate suggesting that Sr/Sr isotope ratios are provisionally useful for determining the origins of illegal wildlife materials in Kenya and elsewhere in Africa.
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