Ecology Flashcards
carying capacity
When graph levels out
Keystone species
Organism that Helps hold system together
Invasive species
Animals or plants that don’t belong in their new environment
Primary concession
New rock is colonized for the first time, no soil is available
Secondary concession
An area previously inhabited is disturbed, soil remains
Example of secondary succession
Fire, flood, deforestation, tornado, hurricane, harvesting
Examples of primary concession
Volcano, lava flow, erosion, glacier retreating
Gradual changes in an ecosystem after a disturbance, goes from a low # of small species to a high number of diverse species, end point is healthy climax community
Both primary and secondary concession
Density dependent factor
Any force that affects the size of a population of living things in response to the density of the population
density independent
Size is not important
Example of density dependent
Contagious disease, lack of food, competition for territory
Example of density independent
Freezing weather, volcanic eruption, flood
Mutualism
Association between organisms of two different species in which each benifets
Commensalism
A relationship between individuals or two species in which one species obtains food or other benifets from the other without harming or benifit the latter
Example of commensalism
Fish by shark
