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What is 1 + 3?
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
Larger organisms that live in a more stable environment, mature slower, live longer, and give alot of parental care
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
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