Habitat Suitability Index models and Instream Flow Suitability curves: brown trout

PREFACE The revised model contains significant changes from the previous model (FWVOBS-8V10.71). The major changes include addition and deletion of habitat variables, shapes of individual SI curves, and modification of the intermediate and final aggregation equations. The model user should carefully review this revised model for applicability and probably use it in place of the earlier version. The Habitat Suitability Index (HSI) models presented in this publication aid in identifying important habitat variables. Facts, ideas, and concepts obtained from the research literature and expert reviews are synthesized and presented in a format that can be used for impact assessment. The models are hypotheses of species-habitat relationships, and model users should recognize that the degree of veracity of the HSI model, SI graphs, and assumptions may vary according to geographical area and the extent of the data base for individual variables. After clear study objectives have been set, the HSI model building techniques presented in U.S. Fish and Wildlife Service (1981) and the general guidelines for modifying HSI models and estimating model variables presented in Terre11 et al. (1982) may be useful for simplifying and applying the models to specific impact assessment problems. Simplified models should be tested with independent data sets, if possible. Statistically-derived models that are an alternative to using Suitability Indices to calculate an HSI are referenced in the text. A brief discussion of the appropriateness of using selected Suitability Index (SI) curves from HSI models as a component of the Instream Flow Incremental Methodology (IFIM) is provided. Additional SI curves, developed specifically for analysis of brown trout habitat with IFIM, also are presented. Results of a model performance test in a limited geographical area are summarized, but model reliability is likely to vary in different geographical areas and situations. The U.S. Fish and Wildlife Service encourages model users to provide comments, suggestions, and test results that may help us increase the utility and effectiveness of this habitat-based approach to impact assessment. Please send comments to:

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