BIOL 1030 Lecture 22: Crowding and Population Limits
13 Mar 2018
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Biol 1030 lecture 22 crowding and population limits: Crowding (lecture notes): crowding lowers birth rate. In many species, smaller adults have fewer offspring. Population change and population density (campbell biology tenth edition p 1197): If immigration and emigration offset each other, then a population grows when the birth rate exceeds the death rate and declines when the death rate exceeds the birth rate. Similar to the case of r-selection, a birth rate or death rate that does not change with population density is said to be density independent. The logistic growth model (campbell biology tenth edition p 1192 - 1193): the mathematical model can be modified to include changes in growth rate as n increases. In reality, there is often a delay before the negative effects of an increasing population are realized. If food becomes limiting for a population, reproduction will decline eventually: this may cause the population to overshoot its carrying capacity temporarily.
