Consumption of freshwater bivalves by muskrats in the Green River, Kentucky
American Midland Naturalist
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Abstract
Muskrats (Ondatra zibethicus) are known to prey on freshwater bivalves (mussels and clams) and can negatively impact imperiled mussel species. However, factors that influence muskrat predation on bivalves are poorly understood. We evaluated the feeding ecology of muskrats in the Green River, Kentucky, by using stable isotope analysis of muskrat hair samples and by monitoring bivalve shell deposition at muskrat middens. Bayesian mixing-model analysis of stable isotope δ15N and δ13C ratios revealed that the median muskrat biomass derived from bivalves was 51.4% (5th and 95th percentiles were 39.1 to 63.4%, respectively), a much higher dietary proportion than previously reported. Shell depositions by muskrats at middens decreased with the availability of seasonal emergent vegetation, suggesting that the consumption of animal matter is in response to a scarcity of plant foods, perhaps exacerbated by the altered flow regimes on the Green River. Our results add to the growing body of evidence that muskrats have the potential to impact mussel population growth and recovery in some environments.
Suggested Citation
Hersey, K.A., Clark, J.D., Layzer, J.B., 2013, Consumption of freshwater bivalves by muskrats in the Green River, Kentucky: American Midland Naturalist, v. 170, no. 2, p. 248-259, https://doi.org/10.1674/0003-0031-170.2.248.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Consumption of freshwater bivalves by muskrats in the Green River, Kentucky |
| Series title | American Midland Naturalist |
| DOI | 10.1674/0003-0031-170.2.248 |
| Volume | 170 |
| Issue | 2 |
| Year Published | 2013 |
| Language | English |
| Publisher | University of Notre Dame |
| Contributing office(s) | Leetown Science Center |
| Description | 12 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | American Midland Naturalist |
| First page | 248 |
| Last page | 259 |
| Country | United States |
| State | Kentucky |
| Other Geospatial | Mammoth Cave National Park |