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Terms in this set (29)
The living and nonliving things in an environment, and all their interactions.
group of organisms that reproduces only with other members of their own group.
a type of symbiotic relationship in which one organism benefits and the other organism is harmed.
organism, such as a green plant or alga, that uses an outside source of energy like the Sun to create energy-rich food molecules.
organisms such as bacteria, fungi, and earthworms that feed on dead organisms.
organism eats both plants and meat/insects
feeding levels in a food chain or web
total number of individuals of one species occupying the same area.
orderly, natural changes, and species replacements that take place in communities of an ecosystem over time. No soil left.
orderly, natural changes, and species replacements that take place in communities of an ecosystem over time. Soil is still left
simple model that shows how matter and energy move through an ecosystem.
10% Energy Rule
each higher trophic level only gets 10% of the energy their prey has
stable, end stage of ecological succession in which balance is in the absence of disturbance.
first organisms in a new ecosystem or after a disaster (succession)
symbiotic relationship in which one species benefits and the other species is neither harmed nor benefited.
a symbiotic relationship in which both species benefit.
One organism kills and eats another organism directly/immediately
a symbiotic relationship where both species need the same resource. Both are harmed because of this relationship
organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients.
organisms that cannot make their own food and must feed on other organisms for energy and nutrients.
any biotic or abiotic factor that restricts the existence, numbers, reproduction, or distribution of organisms.
role or position a species has in its environment; includes all biotic and abiotic interactions as an animal meets its needs for survival and reproduction.
2nd trophic level. Herbivores. Only eats plants
secondary consumer and higher
3rd trophic level and higher. Omnivores and Carnivores.
The process that converts nitrogen gas into biologically useful nitrates. (done mostly by bacteria on plant roots)
only eats plants (also known as primary consumers)
only eats meat or insects
eats both plants and meat/insects
variety (different kinds) of life in an area.
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