EPA Glossary of Climate Change Terms
Living. Living organisms make up the biotic parts of ecosystems. See abiotic.
biotic - of or relating to life.
birth control - preventing birth or reducing frequency of birth, primarily by preventing conception.
Biotic: the living components of an organism"s environment
Bioturbation: the disturbance of sedimentary deposits by living organisms
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Biotic Community: A naturally occurring assemblage of plants and animals that live in the same environment and are mutually sustaining and interdependent. (See: Biome) ...
biotic community See community.
biotic potential The inherent ability of members of a population to grow in numbers within a given time and under stated environmental conditions.
Xenobiotic: Any biological substance, displaced from its normal habitat; a chemical foreign to a biological system.
Compound with a chemical structure foreign to a given organism.
Note: Frequently restricted to man-made compounds.
Antibiotic A chemical agent that is produced by one organism that is harmful to another organism.
Antimicrobial agent An agent that kills or inhibits microbial growth.
Assay A test for a particular chemical or effect.
A term for non-natural or man-made substances found in the environment (i.e., synthetics, plastics).
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A substance that is produced by a species of microorganism and, in dilute solution, has the capacity to inhibit the growth of or kill certain other organisms.
apparent density ...
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Maximum rate at which the population of a given species can increase when there are no limits on its rate of growth. See environmental resistance.
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Biotic Community: a self-sustaining community of living things. An ecosystem.
Biotic Factor: the environmental influence exerted naturally by living organisms: worms that aerate soil, animals that enrich it with manure, trees that throw shade, etc.
 crypsis A defense against predators in which prey species have a shape or coloration that provides camouflage and allows them to avoid detection.  cryptobiotic crust See biological crust.
symbiotic the relationship of two or more organisms of different species or type living together and interacting.
synecology an older term for the study of communities as opposed to the study of a single species ...
Ecosystem An interconnected and symbiotic grouping of animals, plants, fungi and micro-organisms that sustains life through biological, geological and chemical activity.
Bacteroids In legume nodules the symbiotic Rhizobium bacteria that have entered an active nitrogen-fixing state and have usually ceased to divide and commonly become banded and branched.
Another type of root symbiotic association occurs between several species of trees and nitrogen fixing bacteria. In these associations, nodules are produced by the roots of the host plant upon bacterial infection.
These are soil fungi that infect plant roots and produce a symbiotic relationship. The fungi acts as rootlets and increases the surface area available for contact with nutrients (particularly phosphorus and zinc) by ten fold.
Environmental management involves the management of all components of the bio-physical environment, both living (biotic) and non-living (a biotic).
Plant and animal communities as the characterising elements of the biotic environment, together with abiotic factors (soil, climate, water availability and quality, and others), operating together at a particular scale.
Ecological Indicator: A characteristic of an ecosystem that is related to, or derived from, a measure of biotic or abiotic variable, that can provide quantitative information on ecological structure and function.
In order to fix nitrogen many trees rely on fungi in a symbiotic relationship with their roots. If acidity inhibits the growth of these mycorrhizae associations this could lead to trees struggling to fix nitrogen without their symbiotic partners.
All of the physical, chemical, and biotic factors (climate, soil, living things, etc.) that act upon an organism or an ecological community and ultimately determine its form and survival.
Biogeochemical cycle The cycle of elements through the biotic and abiotic environment.
Biosynthesis Catabolism, the production of new cellular materials from other organic or inorganic chemicals.
association of interacting assemblages in a given waterbody, the biotic component of an ecosystem (see also aquatic assemblage).
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Biological resources: Includes genetic resources, organisms or parts thereof, populations, or any other biotic component of ecosystems with actual or potential use or value for humanity.
Plants need nitrogen to grow, but only a few of them are able to take it directly from the air, and even the legumes do it with help from symbiotic bacteria.
Sometimes a symbiotic relationship benefits both species, sometimes one species benefits at the other's expense, and in other cases neither species benefits.
See also: Water, Environment, Soil, Species, Air