A computer model of the oxford great tit population

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Abstract

Functions relating fecundity and mortality of Great tits to various factors are extracted from data given by Lack (1966). A computer program is described which calculates the number of birds in the population over any number of years; it enables the factors affecting fecundity and survival to be tested alone, and in various combinations, for their effects on the population. The results show that the density-independent factors would not control the population for any length of time. The effect of the calculated fecundity functions on the number of tits is shown to be small compared with the effect of the functions relating to juvenile survival.

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    Present address: Department of Zoology, University College Nairobi, Box 30197, Nairobi, Kenya.

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