| A | B |
|---|
| predation | relationship where one species eats another species |
| interspecific competition | relationship when different species have overlapping niches |
| symbiosis | relationships when two species are closely living together |
| mutualism | symbiosis where both species benefit |
| parasitism | symbiosis where one benefits but the other is harmed |
| commensalism | symbiosis where one benefits and the other doesn't care |
| species richness | another name for biodiversity |
| stability | how resistant an ecosystem is to change |
| ecological succession | stages ecosystems go through after they are disturbed |
| primary succession | succession after an area is "blasted" down to the rock |
| secondary succession | succession occuring when there is soil already present |
| pioneer species | the first species into an area that has no soil |
| climax community | a stable community at the end of succession stages |
| population | a group of organisms of the same species in one area |
| birth rate | the number of individuals born into a population |
| death rate | the number of individuals dying in a population |
| age structure | shows the percentage of a population at each age in a population |
| immigration | individuals moving into a population |
| emigration | individuals moving out of a population |
| limiting factor | any variable in the environment that slows population growth |
| exponential model | population growth at a fixed rate in a J-shaped curve |
| logistic growth | population growth that levels off once carrying capacity is reached in a S-shaped curve |
| carrying capacity | the size of population that an environment can support indefinitely |
| density-dependent factors | limiting factors that are more forceful when population size increases |
| density-independent factors | limiting factors not increased or decreased by population size |
