14 3 Population Density and Dist KEY CONCEPT

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14. 3 Population Density and Dist. KEY CONCEPT Each population has a density, a

14. 3 Population Density and Dist. KEY CONCEPT Each population has a density, a dispersion, and a reproductive strategy.

14. 3 Population Density and Distribution. Geographic dispersion of a population shows how individuals

14. 3 Population Density and Distribution. Geographic dispersion of a population shows how individuals in a population are spaced. Population dispersion refers to how a population is spread in an area. Clumped dispersion Uniform dispersion Random dispersion

14. 3 Population Density and Dist. Population dispersion clumped

14. 3 Population Density and Dist. Population dispersion clumped

14. 3 Population Density and Dist. Population dispersion uniform

14. 3 Population Density and Dist. Population dispersion uniform

14. 3 Population Density and Dist. Population dispersion random

14. 3 Population Density and Dist. Population dispersion random

14. 4 Population Growth Patterns KEY CONCEPT Populations grow in predictable patterns.

14. 4 Population Growth Patterns KEY CONCEPT Populations grow in predictable patterns.

14. 4 Population Growth Patterns Changes in a population’s size are determined by immigration,

14. 4 Population Growth Patterns Changes in a population’s size are determined by immigration, births, emigration, and deaths. Four factors affect the size of a population. immigration births emigration deaths

14. 4 Population Growth Patterns Population growth is based on available resources. Exponential growth

14. 4 Population Growth Patterns Population growth is based on available resources. Exponential growth is a rapid population increase due to an abundance of resources.

14. 4 Population Growth Patterns Population growth is based on available resources. Logistic growth

14. 4 Population Growth Patterns Population growth is based on available resources. Logistic growth is due to a population facing limited resources.

14. 4 Population Growth Patterns Carrying capacity is the maximum number of individuals in

14. 4 Population Growth Patterns Carrying capacity is the maximum number of individuals in a population that the environment can support. • A population crash is a dramatic decline in the size of a population over a short period of time.

14. 4 Population Growth Patterns Ecological limit growth. population Ecological factors limit population growth.

14. 4 Population Growth Patterns Ecological limit growth. population Ecological factors limit population growth. A limiting factor is something that keeps the size of a population down. • Density-dependent limiting factors are affected by the number of individuals in a given area.

14. 4 Population Growth Patterns Density-dependent limiting factors are affected by the number of

14. 4 Population Growth Patterns Density-dependent limiting factors are affected by the number of individuals in a given area. – predation – competition – parasitism and disease

14. 4 Population Growth Patterns Predator-Prey Graph

14. 4 Population Growth Patterns Predator-Prey Graph

14. 4 Population Growth Patterns Density-independent limiting factors limit a population’s growth regardless of

14. 4 Population Growth Patterns Density-independent limiting factors limit a population’s growth regardless of the density. – unusual weather – natural disasters – human activities

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