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25 Cards in this Set

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An interacting group of various species in a common location.


A community of living organisms in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system.


Place where an organism or a biological population normally lives or occurs.


It is the variety within and between all species of plants, animals and micro-organisms and the ecosystems within which they live and interact.


The process by which the structure of a biological community evolves over time.


the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years.


An autotrophic organism capable of producing complex organic compounds from simple inorganic molecules through the process of photosynthesis (using light energy) or through chemosynthesis (using chemical energy).


An organism that generally obtains food by feeding on other organisms or organic matter due to lack of the ability to manufacture own food from inorganic sources; aheterotroph.


) An organism whose ecological function involves the recycling of nutrients by performing the natural process of decomposition as it feeds on dead or decaying organisms.

Trophic Level

A position in a food chain or Ecological Pyramid occupied by a group of organisms with similar feeding mode.

Energy Pyramid

A graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain.


A large naturally occurring community of flora and fauna occupying a major habitat


a particular section, group, or type of people or animals living in an area or country.

Carrying Capacity

the number of people, other living organisms, or crops that a region can support without environmental degradation.


the preying of one animal on others.


the influence of closely associated species on each other in their evolution.


a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host.


interaction between two different organisms living in close physical association, typically to the advantage of both.


interaction between two different organisms living in close physical association, typically to the advantage of both.


a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.


The specific area where an organism inhabits.

Fundamental Niche

The full range of environmental conditions and resources an organism can possibly occupy and use, especially when limiting factors are absent in its habitat.

Realized Niche

The part of fundamental niche that an organism occupies as a result of limiting factors present in its habitat.

Competitive Exclusion

The principle that when two species compete for the same critical resources within an environment, one of them will eventually outcompete and displace the other.

Keystone Species

A species whose presence and role within an ecosystem has a disproportionate effect on other organisms within the system.