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Chapter 14

Interactions in Ecosystems

TermDefinition
Habitat can be describes as all of the biotic and abiotic factors in the area where an organism lives
Ecological niche composed of all of the physical, chemical, and biological factors that a species needs to survive, stay healthy, and reproduce
Competitive Exclusion states that when two species are competing for the same resources, one species will be better suited to the niche and the other species will be pushed into another niche or become extinct
Ecological Equivalents species that occupy similar niches but live in different geographical regions
Competition occurs when two organisms fight for the same limited resources
Predation process by which one organism captures and feeds upon another organism
Symbiosis close ecological relationship between two ore more organisms of different species that live in direct contact with one another
Mutualism interspecies interaction in which both organisms benefit from one another
Commenalism relationship between two organisms in which one receives an ecological benefit from another
Parasitism relationship similar to predation in that one organism benefits while the other is harmed
Population density a measurement of the number of individuals living in a defined space
Population dispersion the way in which individuals of a population are spread in an area of a volume
Survivorship curve a generalized diagram showing the number of surviving members over time from a measured set of births
Immigration movement of individuals into a population from another population
Emigration movement of individuals out of a population and into another population
Exponential Growth occurs when a population size increases dramatically over a period of time
Logistic Growth a population begins with a period of slow growth followed by a brief period of exponential growth before leveling off at a stable size
Carrying Capacity The ________ of an environment is the maximum number of individuals of a particular species that the environment can normally and consistently suppport
Population Crash a dramatic decline in the size of a population over a short period of time
Limiting Factor the factor that has the greatest effect in keeping down the size of a population
Density-dependent limiting factor limiting factors that are affected by the number of individuals in a given area
Density-independent limiting factor aspects of the environment that limit a population's growth regardless of the density of the population
Succession sequence of biotic changes that regenerate a damaged community or create a community in a previously uninhabited area
Primary Sucession establishment and development of an ecosystem in an area that was previously uninhabited
Pioneer species the first organisms that live in a previously uninhabited area
Secondary succesion the reestablishment of a damaged ecosystem in an area which the soil was left intact
Created by: tuohybio1415