Moore, Kelly M. S.; Gregory, Stan V. 1989. Geomorphic and riparian influences on the distribution and abundance of salmonids in a Cascade mountain stream. In: Abell, Dana L., tech. coord. Proceedings of the California riparian systems conference: protection, management and restoration for the 1990s; 1988 September 22-24; Davis, CA. Gen. Tech. Rep. PSW-110. Berkeley, CA: Pacific Southwest Forest and Range Experiment Station, U.S. Department of Agriculture: 256-261. p.
Abundance of resident cutthroat (Salmo clarki)and rainbow (Salmo gairdneri) trout was generally 1.5 to3.5 times greater in unconstrained reaches than in con-strained reaches of Lookout Creek, a fourth-order trib-utary to the McKenzie River, Oregon. The presenceof adult rainbow trout depressed juvenile abundance inpools with little habitat complexity but had no effect inpools with more heterogeneous structure. The greaterabundance of trout in unconstrained reaches was relatedto habitat structure, the influence of the riparian canopyon stream productivity, and the effect of channel mor-phology on stream hydraulics. Valley floor landforms aremajor determinants of channel complexity and habitatstructure, providing a hierarchical geomorphic contextfor interpreting riparian influences on patterns of abun-dance and distribution of salmonids within a basin.