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<br />e <br /> <br />ADDITIONAL HABITAT SUITABILITY INDEX MODELS <br /> <br />Model 1 <br /> <br />Optimum riverine habitat for white suckers is characterized by the follow- <br />ing conditions (assuming water quality is adequate): clear (< 50 JTU) streams <br />with cool to moderate summer temperatures (18 to 240 C); 40 to 60% pools; and <br />greater than 40% of the stream area with cover, such as aquatic vegetation, <br />brush, logs, and undercut banks. <br /> <br />HSI = number of above criteria present <br />4 <br /> <br />Model 2 <br /> <br />Optimum lacustrine habitat for white suckers is characterized by the <br />following conditions (assuming water quality is adequate): majority of water <br />body moderately clear (< 75 JTU); greater than 30% of littoral area with <br />aquatic vegetation; and an available spawning stream or windswept lake shore <br />with sand or gravel substrate. . <br /> <br />HSI = number of above criteria present <br />3 <br /> <br />~ ,Model 3 <br /> <br />The appropriate catostomid standing crop model from Aggus and Morais <br />(1979) can be used to calculate an HSI in lakes and reservoirs. The data base <br />was developed from fish standing crop, angler use and harvest, and envi- <br />ronmental data from United States reservoirs with surface areas of 500 acres <br />or larger. The analytical method used includes the application of correlation- <br />regression analysis to experimental data to identify and quantify important <br />relationships between fish standing crop and environmental features in <br />reservoirs. To make the method compatible with HEP, it was necessary to: <br />(1) locate and quantify important standing crop/environmental relations; <br />(2) reduce these to a single estimate of standing crop of a particular species <br />using multiple regression analysis; and (3) convert these to an index of <br />habi tat sui tabil i ty compat i b 1 e with the Habitat Eva 1 uat i on Procedures for <br />comparison to other habitat types. <br /> <br />The National Reservoir Research Program utilizes standing crop of fish as <br />a direct measure of abundance. Therefore, suitability of a particular <br />reservoir habitat to a particular fish species or species group is considered <br />to be positively related to the average standing crop biomass. This approach <br />assumes that total biomass of a particular species reflects successful <br />reproduction, feeding, and presence of suitable habitat for other life <br /> <br />I <br /> <br />23 <br />