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L,R <br />L,R <br />L,R <br /> <br />V,, Logarithm (base 10) of 1• <br />total dissolved solids <br />concentration of surface ~ 0, <br />waters (1 to 2 m deep) <br />during midsummer. ~ 0. <br />•r <br />r <br />~ 0. <br />RS <br />i-~ /~ <br />'~ L . <br />N <br />0. <br />V5 Least suitable pH in <br />spawning habitat during <br />embryo and fry stages. <br />V6 Average length of frost- <br />free season (average <br />number of days between <br />last, spring occurrence <br />and 'first fall occurrence <br />of an air temperature of <br />0° C). <br />19 <br />0 1 2 3 4 <br />log ppm <br />l.0 <br />~ 0.8 <br />c <br />~, <br />,, 0.6 <br />+~ <br />•r <br />r <br />0.4 <br />+~ <br />'~ 0.2 <br />N <br />3 5 7 9 11 <br />pH <br />0.0 <br />1.0 <br />x 0.8 <br />a, <br />'~ 0.6 <br />a <br />r 0.4 <br />'~ 0.2 <br />0 100 200 300 <br />days <br />00 <br />