Population- an interbreeding group of individuals of a single species that occupy the same general area.

Community-interacting populations that live in the same area.

Ecosystem- made of 1 or more communities and the abiotic environment within an area.

•Characteristics of Dynamics

•Size•Density•Immigration•Emigration•Births•Deaths•Survivorship

Anything that restricts the number of individuals in a population.

Includes living and nonliving features of the ecosystem

density-dependentdensity-dependent factorsfactors

DiseaseDisease CompetitionCompetition PredatorsPredators ParasitesParasites Food Food Crowding (space)Crowding (space)

The greater the The greater the population, the population, the greater effect these greater effect these factors have. factors have. (BIOTIC)(BIOTIC)

density-independentdensity-independent factorsfactors

Volcanic eruptionsVolcanic eruptionsTemperatureTemperatureStormsStormsFloodsFloodsDroughtDroughtFloodingFlooding

Most are Most are ABIOTICABIOTIC factorsfactors

What kind of factor do you think influenced the deaths of these cows?Was it density-dependent or Independent? Explain.

Carrying capacity (K): The number of organisms of one species that an environment can support indefinitely.

Two of the most basic factors that affect the rate of population growth are the birth rate, and the death rate.

The Exponential curve (also known as a J-curve) occurs when there is no limit to population size. No (K)

The Logistic curve (also known as an S-curve) shows the effect of a limiting factor (in this case the carrying

capacity (K)of the environment).

Humans have learned to expand the carrying capacity of their environment by increasing food supply, combating pests and curing diseases.

Can Earth support this increase?

Damage to the planet will eventually reduce the carrying capacity for humanity and slow the growth of the human population.