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25 Cards in this Set

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A group of various species that live in the same habitat


A community of organisms and their abiotic enviroment


A place were an organism 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 a 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 materials or obtaining other nutrients from inorganic sources


An organism that feeds by breaking down organic matter from dead organisms.

trophic levels

One of the steps in a food chain or food pyramid

energy pyramid

A triangular diagram that shows an ecosystems 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 feed 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 one species, the parasite, benefits from the other species, the host, which is harmed


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


A relationship in which both of the species benefit from each other


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's physical use of it habitat, and it's function within an ecological community

fundamental niche

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

realized niche

The range of resources that a species uses, the conditions that the species can tolerate, and the function 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 species in it's community