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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 environment.


a place where an organism usually lives.


the variety of organisms in a given area, the genetic variation within a population, the variety of species in a community, or 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 long period of time.


a large region characterized by a specific type of climate and certain types of plant and animal communities.


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


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


an organism that feed by breaking down organic matter from dead organisms.

Trophic Level

one of the steps in a food chain or food pyramid.

Energy Pyramid

a triangular diagram that shows an ecosystem's loss of energy, which results as energy passes through the ecosystem's 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 the other organism, the prey.


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


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


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


a relationship between two species in which both benefit.


a relationship between two organisms in which one organism benefits and the other is unaffected.


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

Fundamental Niche

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

Realized Niche

the range or 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 that 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.