Population regulation is a fundamental process linked to most phenomena in ecology: regulation results from potentially stabilizing density-dependent processes, even when caused by non-equilibrium mechanisms (Murdoch, 1994). No population continues to grow indefinitely. Specifically, populations that exhibit exponential growth eventually succumb to the limitations imposed by the environment. As the density of a population changes, a series of natural and environmentally controlled interactions form between members of the population, thereby regulating population size. These interactions include a wide variety of mechanisms linked to physiological, morphological and behavioral adaptations (Smith & Smith, 2012).The concept of logistic population growthAccording to Smith (1966), concept popularized in 1978 by the English clergyman and economist Thomas Robert Malthus states that births, deaths, and movements influence both the number of organisms in a given area and the growth of the population itself. Like the individuals that make up a population, the population itself begins as a small unit and continues to grow until it reaches a certain level of equilibrium with the environment. Upon its initial colonization of an unoccupied habitat, it grows geometrically in proportion to its numbers the longer it is in an area with constant environmental conditions and excessive resources. However, as the population increases, the detrimental effects of increasing population density begin to slow the growth rate. Since resources are limited, exponential growth cannot be sustained indefinitely. The maximum population size that can be maintained for a particular environment...... middle of paper ...... competition, dominant individuals claim sufficient resources for growth and reproduction. Others do not produce offspring or perish. Competition may involve interference between individuals or indirect interactions through the exploitation of resources. Comp, Growth and Development Competition for scarce resources can decrease or delay growth and development. To some extent, plants respond to competition by changing their shape and size. Competition and Mortality A common response to high population density is reduced survival. Mortality functions to increase the availability of resources for remaining individuals, thereby allowing increased growth. Competition and reproduction High population density and competition can also delay reproduction in animals and reduce fecundity in plants and animals. Smith, Thomas M. and Robert Leo Smith. Ecology elements. Pearson, print.2012