POPULATION BIOLOGY

Population of Biology

Population biology is the biology study of factor involved in the stability, variability, and density of populations of plants or animal. Among such factors are predator-prey relationships, birthrates, death rates, food supply, migration pattern, age and sex distribution relationships between members of different species living in the same species, in the same area , cooperation and competition among members of the species.Genetically controlled behavior pattern, and environmental influence. Population biologists attempt to develop general mathematical models that incorporate the many factors regulating the size and density of population. The Equations are useful for predicting in a given population.

Population dynamic seeks to describe changes in population densities and explain these change in term of underlying biological forces. It is the basis of an ecological patterns and is also necessary to solve problem of human economy, such as biological conservation, pest management, and optimal harvesting of wild life population. A population comprises the organism of a single species in defined region- for example, the yellow fever mosquitoes Aedes aegypty in Singapore. For meaningful scientific analysis, the region over which the population is defined should be small enough that all of organisms have the potential to interact; for example, they could interact sexually or by fighting.

Density. The first problem addressed in population study is the measurement of density. Only a few populations, such as human and large mammalian grazers, can be counted completely , but often a complete census can be taken of some life stage or subclass of a populations.

Normally some kind of statistical sampling of small areas within the region is required. Finally, for some species, such as those which lived in or under the ground or which are active at night, only a relative index of density can be obtained. These estimated can be made from the various products of their activity-track, excrement, pelts of kills, discarded shells, tailings forms burrows, and vocalization.