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Chapter 14

Interactions in Ecosystems

habitat combined biotic and abiotic factors found in the area where an organism lives
ecological niche all of the physical, chemical, and biological factors that a species needs to survive, stay healthy, and reproduce in an ecosystem
competitive exclusion theory that states that no two species can occupy the same niche at the same time
ecological equivalent organisms that share a similar niche but live in different geographical regions
competition ecological relationship in which two organisms attempt to obtain the same resource
predation process by which one organism hunts and kills another organism for food
symbiosis ecological relationship between members of at least two different species that live in direct contact with one another
mutualism ecological relationship between two species in which each species gets a benefit from the interaction
commensalism ecological relationship in which one species receives a benefit but the other species is not affected one way or another
parasitism ecological relationship in which one organism benefits by harming another organism
population density measure of individuals living in a defined area
population dispersion way in which individuals of a population are spread out over an area or volume
survivorship curve graph showing the surviving members of each age group of a population over time
immigration movement of individuals into a population
emigration movement of individuals out of a population
exponential growth dramatic increase in a population over a short period of time
logistic growth population growth that is characterized by a period of slow growth, followed by a period of exponential growth, followed by another period of almost no growth
carrying capacity number of individuals that the resources of an environment can normally and persistently support
population crash dramatic decline in the size of a population over a short period of time
limiting factor environmental factor that limits the growth and size of a population
density-dependent limiting factor environmental resistance that affects a population that has become overly crowded
density-independent limiting factor environmental resistance that affects a population regardless of population density
succession sequence of biotic change that regerenerates a damaged community or start a community in a previously uninhabitated area
primary succession establishment and development of an ecosystem in an area that was previously uninhabited
pioneer species organism that is the first to live in a previously uninhabited area
secondary succession reestablishment of a damaged ecosystem in an area where the soil was left intact
Created by: harolds21