R. Bruce Bury Wynn W. Cudmore 2014 We investigated the potential for resource partitioning between the Coastal giant salamander (<i>Dicamptodon tenebrosus</i>) and the Cascade torrent salamander (<i>Rhyacotriton cascadae</i>) by examining their diet and microhabitats in forest streams. Larval <i>D. tenebrosus</i> and <i>R. cascadae</i> fed primarily upon aquatic insect larvae. We found similar foods in larval and adult <i>R. cascadae</i> and combined these results. <i>Dicamptodon</i> larvae consumed ephemeropteran, plecopteran, and trichopteran larvae in about equal amounts whereas <i>R. cascadae</i> ate more trichopteran and less ephemeropteran larvae than <i>D. tenebrosus</i>. Diet of all <i>R. cascadae</i> overlapped more with smaller than larger sized <i>D. tenebrosus</i> larvae. Comparisons of diets with available foods indicated <i>R. cascadae</i> is more selective or more gape-limited in its feeding habits than <i>D. tenebrosus</i> larvae. The two salamanders differed in use of microhabitats in creeks, which may contribute to their diet differences. application/pdf 10.1674/0003-0031-172.1.191 en University of Notre Dame Resource partitioning in two stream salamanders, Dicamptodon tenebrosus and Rhyacotriton cascadae, from the Oregon Cascade Mountains article