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Table 3.

Effect of deviating from the predicted optimal groundspeeds for prolonged (RP) and sprint modes(RS), and of deviating from the mean observed groundspeed within each nominal velocity (RU)

RP
RS
RU
SpeciesCoefficientPDistributionCoefficientPDistributionCoefficientPDistribution
American shad 0.0022 0.337 Weibull -0.0326 <0.001 Gamma -0.0223 0.546 Weibull 
Alewife -0.0081 0.033 Weibull -0.0336 0.358 Weibull 
Blueback herring -0.0155 0.005 Lognormal -0.041 0.5336 Lognormal 
Striped bass -0.0031 0.694 Lognormal -0.0194 0.013 Lognormal 0.1479 0.083 Lognormal 
Walleye -0.005 0.551 Weibull -0.0204 <0.001 Gamma 0.056 0.406 Weibull 
White sucker 0.0309 0.002 Weibull -0.0329 <0.001 Weibull 0.1284 0.001 Weibull 
RP
RS
RU
SpeciesCoefficientPDistributionCoefficientPDistributionCoefficientPDistribution
American shad 0.0022 0.337 Weibull -0.0326 <0.001 Gamma -0.0223 0.546 Weibull 
Alewife -0.0081 0.033 Weibull -0.0336 0.358 Weibull 
Blueback herring -0.0155 0.005 Lognormal -0.041 0.5336 Lognormal 
Striped bass -0.0031 0.694 Lognormal -0.0194 0.013 Lognormal 0.1479 0.083 Lognormal 
Walleye -0.005 0.551 Weibull -0.0204 <0.001 Gamma 0.056 0.406 Weibull 
White sucker 0.0309 0.002 Weibull -0.0329 <0.001 Weibull 0.1284 0.001 Weibull 

Data are from nominal velocities where >10% of fish swam within the modeled mode. Significant negative coefficients (based on one-tailed tests and highlighted in bold) indicate that deviating from the predicted optimum swim speed resulted in reduced distance of ascent and support the optimization hypothesis; positive coefficients indicate increased distance of ascent.

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