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Abstract
Hair from black bears (Ursus americanus), collected from four areas in the Big Bend ecosystem, has been analyzed for stable isotopes of carbon, nitrogen, and sulfur to determine major food sources and for trace metals to infer possible effects of environmental contaminants. Results indicate that black bears are largely vegetarian, feeding on desert plants, nuts, and berries. Mercury concentrations in bear hair are below safe level standards (
Publication type | Report |
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Title | Stable isotope and trace element studies of black bear hair, Big Bend ecosystem, Texas and Mexico |
Year Published | 2008 |
Language | English |
Publisher | U.S. Geological Survey |
Publisher location | Reston, VA |
Contributing office(s) | Fort Collins Science Center |
Description | 8 p. |
Larger Work Type | Report |
Larger Work Subtype | USGS Numbered Series |
Larger Work Title | Geological, geochemical, and geophysical studies by the U.S. Geological Survey in Big Bend National Park, Texas (Circular 1327) |
First page | 77 |
Last page | 84 |
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