Population Dynamics
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Description: Essay discussing the factors behind the variation in the number of individuals in a bird population over time.
he "dynamics" of bird populations, the ways in which their numbers grow and shrink as time goes by, are controlled by the same general factors that control the size of human populations. An avian or human population has two kinds of input -- birth (natality) and immigration. And each population has the same two outputs -- death (mortality) and emigration. If the inputs are greater than the outputs, the population will grow. If the outputs are higher than the inputs, it will shrink. If the two are in balance, the population size will not change, or as ecologists would say, the population "density" is constant. Population density is, technically, the number of individuals per unit area. But since a population normally occupies a limited area of suitable habitat, its size increases, decreases, or remains stable along with its density.
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| Page title: | Population Dynamics |
| Keywords: | Population Dynamics |
| Description: | Population Dynamics |
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