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<br />different suggesting that fathead minnow were more sensitive to selenium than razorback sucker <br />(p = 0.0002; Table 5). The regression equation describing probability of survival (p(survival)) of <br />razorback sucker to dissolved selenium exposure (mg/L) has the form: <br />logit = -13.7 + 8.53 • logo (exposure concentration) <br />wherep(survival) = 1- (e'°g'' / (1 + e'°g'`)) The regression equation for fathead minnow has the <br />form: <br />logit = -13.9 + 9.14 • logo (exposure concentration). <br />These regression equations can be used to estimate the probability of survival after 96-hour <br />exposure to any concentration of dissolved selenium (Se+6) <br />20 <br />