FACTOID # 15: A mere 0.8% of West Virginians were born in a foreign country.
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Encyclopedia > Regulating factor

In population ecology, a regulating factor is something that keeps a population at equilibrium (neither increasing nor decreasing in size over time). Population ecology is a major subfield of ecology—one that deals with the dynamics of species populations and how these populations interact with the environment. ... Punctuated equilibrium (or punctuated equilibria) is a theory in evolutionary biology which states that most sexually reproducing species will show little to no evolutionary change throughout their history. ...

An example of a regulating factor would be food supply. If the population increases to a certain size, there will be less food for each organism. This will lead to fewer births (a decrease in fecundity) and more deaths, making a negative growth rate. As there are now fewer animals, the amount of food for each organism will increase, meaning the growth rate will become positive. This would lead to a large population size again, and the cycle would start over. Therefore, food is a regulating factor in this scenario, as food supply keeps the population at relative equilibrium. Food distribution is a vital factor in public nutrition. ... Birth is the process in mammals by which a fetus is expelled from the body of its mother. ... Fecundity is the potential reproductive capacity of an organism or population, measured by the number of gametes (e. ... This page deals with the cessation of life. ... Population growth rate is a term used in demographics and ecology which refers to the rate at which the number of individuals in a population increases. ... The word Animals when used alone has several possible meanings in the English language. ...

All regulating factors are density-dependent, meaning they keep populations at equilibrium by counteracting fluctuations in population size. Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ...

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