# Ch. 35 Population Dynamics Flashcards

Population Dynamics

Changes in population size results from various forces that control and regulate populations over time

Population

A group of interacting individuals belonging to one species and living in the same geographic area

Population Density

of individuals of a species per Area/Volume

Dispersion Pattern

Manner in which individuals in a population are spaced within their area

Clumped (Dispersion)

Individuals aggregated in patches

- results from unequal distribution of resources)

Uniform (Dispersion)

Individuals are evenly distributed

- results from interactions among individuals of a population

Random (Dispersion)

Unpredictable dispersion

- rare due to environment and social interaction
- used for testings other dispersion

Exponential Growth Model

A mathematical description of idealized, unregulated, population growth

Intrinsic rate of increase

An organism inherent capacity to reproduce

Population Limiting Factors

Environment factors that restrict population growth

Logistics Growth Model

A mathematical description of idealized population growth that is restricted by limiting factors

Carrying capacity

In a population, the # of individuals an environment can sustain

Density - dependent Factors

A population limiting factor whose effects depend on population density

- affect more individuals as # goes up
- laboratory population, natural population

Density - independent Factor

A population limiting factor whose occurrence/effects are not affected by population density

- abiotic factors
- affects same number no matter the population size

Life Tables

A listing of survivals and deaths in a population in a particular time period and predictions of how long, on average, an individual of a given age will live