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' Habitat variables <br />Ratio of spawning habitat to <br />summer habitat [area that is <br />less than 1 m deep and <br />vegetated (spring) divided <br />by total midsummer area] (V1) <br />Suitability indices <br />SI, <br />Drop in water level during embryo <br />and fry stages (VZ) SI, <br />Percent of midsummer area with <br />emergent and/or submerged <br />aquatic vegetation or remains <br />of terrestrial plants (bottom <br />debris excluded) (V3) SI, <br />HSI <br />1 <br />Loglo TDS in epilimnion during <br />midsummer (V4) SI4 <br />Least suitable pH in spawning <br />habitat during embryo and <br />fry stages (Vs) SIS <br />Average length of frost-free <br />season (Ve) SI6 <br />Maximal weekly average <br />temperature of the <br />epilimnion (1 to 2 m <br />deep) (V,) SI, <br />Figure 1. Diagram showing habitat variables included in the lacustrine <br />HSI model for northern pike and the aggregation of the corresponding <br />suitability indices (SI's) into an HSI. HSI = the lowest of the seven <br />suitability index ratings. <br />13 <br />