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Bio Chapter 14

TermDefinition
habitat the place where an organism usually 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 the exclusion of one species by another due to competition
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 an interaction between two organisms in which one organism, the predator, kills and feeds on the other organism, the prey
symbiosis a relationship in which two different organisms live in close association with each other
mutualism a relationship between two species in which both species benefit
commensalism a relationship between two organisms in which one organism benefits and the other is unaffected
parasitism a relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed
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 the movement of an individual or a group to a new community or region
emigration the movement of an individual or group out of its native area
exponential growth logarithmic growth, or growth in which numbers increase by a certain factor in each successive time period
logistic growth population growth that starts with a minimum numbers of individuals and reaches a maximum depending on the carrying capacity of the region; described by an S-shaped curve
carrying capacity the largest population that an environment can support at any given time
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 the replacement of one type of community by another at a single location over a period of time
primary succession establishment and development of an ecosystem in an area that was previously uninhabited
pioneer species a species that colonizes an uninhabited area and that starts an ecological cycle in which many other species become established
secondary succession reestablishment of a damaged ecosystem in an area where the soil was left intact
Created by: mariazierolf