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Title: Redd site selection and spawning habitat use by fall chinook salmon: The importance of geomorphic features in large rivers

Knowledge of the three-dimensional connectivity between rivers and groundwater within the hyporheic zone can be used to improve the definition of fall chinook salmon (Oncorhynchus tshawytscha) spawning habitat. Information exists on the microhabitat characteristics that define suitable salmon spawning habitat. However, traditional spawning habitat models that use these characteristics to predict available spawning habitat are restricted because they can not account for the heterogeneous nature of rivers. The authors present a conceptual spawning habitat model for fall chinook salmon that describes how geomorphic features of river channels create hydraulic processes, including hyporheic flows, that influence where salmon spawn in unconstrained reaches of large mainstem alluvial rivers. Two case studies based on empirical data from fall chinook salmon spawning areas in the Hanford Reach of the Columbia River are presented to illustrate important aspects of the conceptual model. The authors suggest that traditional habitat models and the conceptual model be combined to predict the limits of suitable fall chinook salmon spawning habitat. This approach can incorporate quantitative measures of river channel morphology, including general descriptors of geomorphic features at different spatial scales, in order to understand the processes influencing redd site selection and spawning habitat use. This information is needed inmore » order to protect existing salmon spawning habitat in large rivers, as well as to recover habitat already lost.« less
Authors:
 [1] ;  [2]
  1. Pacific Northwest National Lab., Richland, WA (United States). Ecology Group|[Oregon State Univ., Corvallis, OR (United States). Dept. of Fisheries and Wildlife
  2. Pacific Northwest National Lab., Richland, WA (United States). Ecology Group
Publication Date:
OSTI Identifier:
655410
DOE Contract Number:
AC06-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Environmental Management; Journal Volume: 22; Journal Issue: 5; Other Information: PBD: Sep-Oct 1998
Sponsoring Org:
USDOE Bonneville Power Administration, Portland, OR (United States)
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; COLUMBIA RIVER; HABITAT; SALMON; GROUND WATER; MATHEMATICAL MODELS; MIGRATION; HYDROELECTRIC POWER PLANTS; ENVIRONMENTAL IMPACTS