Population

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Population

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particular section, group, or type of people or animals living in an area or country.

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Population size

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In population genetics and population ecology, population size (usually denoted N) is the number of individual organisms in a population.

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Populatio density

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Population density (in agriculture : standing stock and standing crop) is a measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.

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Dispersion

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A specific type of organism can establish one of three possible patterns ofdispersion in a given area: a random pattern; an aggregated pattern, in which organisms gather in clumps; or a uniform pattern, with a roughly equal spacing of individuals.

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Population Model

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A population model is a type of mathematicalmodel that is applied to the study of populationdynamics. Models allow a better understanding of how complex interactions and processes work.

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Exponential Growth Curve

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Exponential growth is growth that increases at a consistent rate, and it is a common occurrence in everyday life.

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Carrying Capacity

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the number of people, other living organisms, or crops that a region can support without environmental degradation.

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Density dependent Factor

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One very important mechanism for regulating population size is density dependence. Thedensity of a population is simply how many organisms are living in a given area. Density-dependent factors are factors where the effects on the size or growth of a population vary with the density of the population itself.

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Logisitic Model

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In statistics, logistic regression, or logit regression, or logit model is a regression model where the dependent variable (DV) is categorical. This article covers the case of binary dependent variables—that is, where it can take only two values, such as pass/fail or win/lose.

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Density Independent Factor

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density-independent factor Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. An example of such a factor is an earthquake, which will kill all members of the population regardless of whether the population is small or large.

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r-strategist

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The two evolutionary "strategies" are termed r-selection, for those species that produce many "cheap" offspring and live in unstable environments and K-selection for those species that produce few "expensive" offspring and live in stable environments.

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k-strategist

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Their reproductive strategy is to grow slowly, live close to the carrying capacity of their habitat and produce a few progeny each with a high probability of survival. Typical K-selected organisms are elephants, and humans. The table below summarizes some of the differences between r-organisms and K-organisms.