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<br />Cover. Pool velocity (V16) and gradient (VIS) are included because white <br /> <br />suckers show a marked preference for slow to moderate vel ocit i es and do not <br />occur where there is no flow. Juvenil es and adul ts prefer water of low <br />velocity, while fry are found in a wider range of velocities. Shade (V14) is <br /> <br />an indication of cover, and white suckers are observed in shaded pools. <br />Instream cover (root systems, uprooted trees, undercut banks, brush) and <br />shoreline cover (willows, grass) (Vg) are very important to white suckers, <br /> <br />especially in pools. A high correlation between pool cover and wh.ite sucker <br />populations was observed by Propst (1982b) and white suckers flee to the cover <br />of pools when disturbed. Pool depth (V13) is included because depth offers <br /> <br />cover and greater numbers of white suckers are found in deeper pools, espe- <br />cially those lacking in instream cover. Percent pools (VIO) is important <br /> <br />because adult and juveniles are common pool inhabitants and pools allow resting <br />areas for white suckers moving upstream to spawn or waiting to spawn. <br /> <br />, <br /> <br />SUITABILITY INDEX (51) GRAPHS FOR MODEL 5 <br /> <br />Suitability indices for model 5 are given below. The model is for <br />riverine (R) habitats. The rationale for the alternative variables is listed <br />in Table 5. <br /> <br />Habitat Variable <br /> <br />R <br /> <br />VI <br /> <br />Maximum monthly <br />average turbidity <br />during the year. <br /> <br /> <br />26 <br /> <br />I <br />