| Autor: |
van Winkle, Webster, Deangelis, Donald L., Blum, Stephen R. |
| Zdroj: |
Transactions of the American Fisheries Society; May 1978, Vol. 107 Issue: 3 p395-401, 7p |
| Abstrakt: |
A density-dependent function for the instantaneous fishing mortality rate is presented. It is shown that this function may be readily incorporated into the age-specific probability of survival in a Leslie-matrix population model. A method is presented for indirectly determining the probability of survival for age-class 0 of a fish population using a density-dependent Leslie matrix. The method involves the two constraints that the population be at equilibrium and that the index of absolute population size in the density-dependent function be assigned a value. In addition, given the probability of survival for age-class 0, it is shown that the probability of survival through a selected life stage within age-class 0 can be indirectly determined. Three problems in modeling a fish population using a Leslie model are discussed in light of the difficulties involved in modeling density dependence due to insufficient information and lack of understanding concerning density-dependent phenomena. |
| Databáze: |
Supplemental Index |
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