Resource partitioning in two stream salamanders, Dicamptodon tenebrosus and Rhyacotriton cascadae, from the Oregon Cascade Mountains
American Midland Naturalist
By: Wynn W. Cudmore and R. Bruce Bury
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Abstract
We investigated the potential for resource partitioning between the Coastal giant salamander (Dicamptodon tenebrosus) and the Cascade torrent salamander (Rhyacotriton cascadae) by examining their diet and microhabitats in forest streams. Larval D. tenebrosus and R. cascadae fed primarily upon aquatic insect larvae. We found similar foods in larval and adult R. cascadae and combined these results. Dicamptodon larvae consumed ephemeropteran, plecopteran, and trichopteran larvae in about equal amounts whereas R. cascadae ate more trichopteran and less ephemeropteran larvae than D. tenebrosus. Diet of all R. cascadae overlapped more with smaller than larger sized D. tenebrosus larvae. Comparisons of diets with available foods indicated R. cascadae is more selective or more gape-limited in its feeding habits than D. tenebrosus larvae. The two salamanders differed in use of microhabitats in creeks, which may contribute to their diet differences.
Suggested Citation
Cudmore, W.W., and Bury, R.B., 2014, Resource partitioning in two stream salamanders, Dicamptodon tenebrosus and Rhyacotriton cascadae, from the Oregon Cascade Mountains: American Midland Naturalist, v. 172, no. 1, p. 191-199, https://doi.org/10.1674/0003-0031-172.1.191.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Resource partitioning in two stream salamanders, Dicamptodon tenebrosus and Rhyacotriton cascadae, from the Oregon Cascade Mountains |
| Series title | American Midland Naturalist |
| DOI | 10.1674/0003-0031-172.1.191 |
| Volume | 172 |
| Issue | 1 |
| Year Published | 2014 |
| Language | English |
| Publisher | University of Notre Dame |
| Publisher location | Notre Dame, IN |
| Contributing office(s) | Forest and Rangeland Ecosystem Science Center |
| Description | 9 p. |
| First page | 191 |
| Last page | 199 |
| Country | United States |
| State | Oregon |
| Other Geospatial | Cascade Mountains |