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A group of organisms of all the same species that live in a specific area


controls prey and predator populations


within a population and between populations (over food, habitat, and mates)

Crowding and Stress

Leads to: increase of aggression, decrease of parental care, decreased fertility, decreased disease resistance

Slow Life-History

Larger organisms that live in a more stable environment, mature slower, live longer, and give alot of parental care

Rapid Life-History

Smaller organisms that have a shorter life span, live in a less stable environment, mature fast, and give little parental care

Density independent factors

Impacts population regardless of the density

Density dependent factors

Impact of the limiting factor depends on the density of the population. Higher the population the higher the effects of the limiting factor

How populations grow

Exponential Growth: starts slow but as the numbers of organisms able to reproduce grows the faster the population grows

Carrying Capacity

The limit of a population that a habitat can handle

What are invasive species

a species not native to the area that spread quickly, driving down the populations of native species

How do invasive species affect the Great Lakes

They create more competition with the native species for food, space and mates; they also run down the population of native species.

How is the human population growing and have we reached carrying capacity

growing exponentially, and we have not yet reached carrying capacity because we have not experienced a serious downfall in our overall population

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