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25 Cards in this Set

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a group of various species that live in the same habitat and interact with each other.


a community of organisms and their abiotic enviorment


a place where an organism usually lives


the variety of organisms in a given area, the genetic variation within a population , the variety of communities in an ecosystem


the replacement of one type of community by another at a single location over a period of time


the average weather conditions in an area over a period of time


a large region characterized by a specific type of climate and certain of plants and animal communities


a photosynthetic or chemosynthetic autotroph that serves as the basic food source in a certain ecosystem


an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources


an organism that feeds by breaking down organic matter from dead organisms

trophic level

one of the steps in a food chain or food pryimid

energy pyrimid

a triangular diagram that shows an ecosystems ;loss of energy, which results as energy passes through the ecosystems food chain


a group of organisms of the same species that live in a specific geographical area and interbreed

carrying capacity

the largest population that an environment can support at any given time


an interaction between two organisms in which one organism, the predator, kills and feeds on another, the prey


the evolution of two or more species that is due to mutual influence


a relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed


a relationship in which two different organisms live in a close association with each other


a relationship between two species in which both species benefit


a relationship between two organisms in which one organism benefits the other is uneffected


the unique position occupied by a species, both in terms of its physical use of its habitat and its function within an ecological mcommunity

fundamental niche

the largest ecological niche where an organism or species can live without compition

Realized niche

the range of resources that a species uses, the conditions that the species can tolerate, and the functional roles that the species plays as a result of competition in the species' fundamental niche

competitive exclusion

the exclusion of one species by another due to competition

keystone species

a species tat is critical to the functioning of the ecosystem in which it lives because it affects the survival and abundance of many other species in its community