Evaluation of a Stream Channel-Type System for Southeast Alaska

摘要

Nine channel types within a hierarchical channel-type classification system(CTCS) were surveyed to determine relations between salmonid densities and species distribution, and channel type. Two other habitat classification systems and the amount of large woody debris also were compared to species distribution and salmonid densities, and to stream channel types. Although trends appeared in salmonid densities and channel types, population estimates were too variable to show a relation between density and channel types. Depth-velocity criteria that separated habitat into shallow-slow, deep-slow, shallow-fast, and deep-fast were poorly related to fish populations and channel types. Within Bisson classification system, coho salmon (Oncorhynchus kisutch) parr were positively correlated to off-channel habitat types. Large wood was more abundant in despositional channel types, and coho salmon densities were positively related to debris accumulations of 10 or more pieces and to rootwads.