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parameter value). The eggs produced per female for each year is randomly generated <br />based upon the expected production ± a randomly generated standard-normal deviate. <br />The standard-normal deviate depends upon the standard deviation observed in egg <br />production per female. A proportion of the eggs die based upon an egg specific <br />mortality rate, which varies stochastically as described earlier and then the larval fish <br />begin to disperse downstream from the spawning bed and become age-0 fish. Like the <br />adults, the age-0 ash move into a segment (solid arrows) if their numbers are low <br />relative to the carrying capacity then the fish remain in that section (density <br />dependence, the amount of low velocity habitat, etc.). If the number of fish already <br />present equals carrying capacity, then the age-0 fish continue downstream. if the <br />carrying capacity is not exceeded, then a number remains so that the canrying capacity <br />is equaled and the remaining larvae continue downstream. For each habitat segment <br />that the larvae have to move through in moving downstream from the spawning bed, a <br />proportion die based upon a larval mortality rate for dispersal. This means that the <br />further a larval fish has to move downstream, the less likely it is to survive. <br />3. The surviving juveniles remain in the river segment if the carrying capacity for their <br />age category's carrying capacity is not exceeded (dashed arrows). If the carrying <br />capacity is exceeded, the excess individuals of the juvenile age class leave the <br />segment and continue to move downstream until they find a segment where the <br />carrying capacity is not yet attained. The number of individuals needed to raise the <br />juvenile population in the segment to carrying capacity remain and the excess proceed <br />10 <br />