AP BIO Unit 8.3
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9 Terms
Bottom-Up Control
Availability of resources dictates the population size/structure above
Top-down
Highest tropic levels dictate the structure of the lower levels
Key Stone Species
Maintain the structure and stability of an ecosystem (ex: loss of main predator can cause the ecosystem to grow uncontrollably and habitat disruption)
Births+ Immigraiton =
Increases in population sizes
Death+ Migration=
Decreases in population sizes
Density Independent
Enviorment factors that effect population sizes, regardless. (natural disasters, human activites)
Density Dependent
Enviormental factors that depend on the population sizes (predation, competition, disease)
What happens when a population exceeds
The density dependent chimes in and the population starts to decline due to lack of resources/competiton
When a population reproduces without limits..
It’s exponetinal growth - grows constant
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