29 terms

Ecology

STUDY
PLAY
abiotic factor
Non-living factors which effect survival
autotroph
an organism that makes its own food
biosphere
the part of earth where life exists
biotic factors
living factors which effect survival
commensalism
the relation between two different kinds of organisms when one receives benefits from the other without damaging it
consumer
an organism that eats other organisms or organic matter
community
group of various species living in the same area and interact with each other.
decomposer
an organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients
density-dependent factor
a variable affected by number of organisms in the area.
density-independent factor
a variable affects a population regardless of the population density.
ecology
study of interactions between organisms and their environment.
ecosystem
community of organisms their abiotic environment.
emigration
movement of individuals out of an area
exponential growth
% growth that leads to doubling time
food chain
a series of steps in which organisms transfer energy by eating and being eaten
food web
(ecology) a community of organisms where there are several interrelated food chains
habitat
the type of environment in which an organism or group normally lives or occurs
heterotroph
organism that obtains energy from the foods it consumes; also called a consumer
mutualism
symbiotic relationship in which both species benefit from the relationship
nich
role in ecosystem
parasitism
A relationship between two organisms of different species where one benefits and the other is harmed
population
a group of organisms of the same species populating a given area
scavenger
any animal that feeds on refuse and other decaying organic matter
symbiosis
relationship in which two species live closely together
trophic level
feeding level in an ecosystem
carrying capacity
largest number of individuals of a population that a given environment can support
immigration
movement of individuals into an area occupied by an existing population
linear growth
Expansion that increases by the same amount during each time interval.
detritivore
organism that feeds on plant and animal remains and other dead matter