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26 terms

Unit 2: Ecology

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Population
a group of organisms of the same species populating a given area
Community
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
Biosphere
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
Ecosystem
collection of all the organisms that live in a particular place, together with abiotic factors of their environment
Food Web
a diagram that shows the feeding relationships between organisms in an ecosystem
Biome
a major biotic community characterized by the dominant forms of plant life and the prevailing climate
Photosynthesis
process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches
Chemosynthesis
process by which some organisms, such as certain bacteria, use chemical energy to produce carbohydrates
Producers
organisms that make their own food
Autotrophs
organisms that make their own food
Consumers
an organism that obtains energy and nutrients by feeding on other organisms or their remains.
Heterotrophs
an organism that obtains energy and nutrients by feeding on other organisms or their remains.
Herbivore
organism that obtains energy by eating only plants
Carnivore
organism that obtains energy by eating animals
Omnivore
organism that obtains energy by eating both plants and animals
Scavenger
A carnivore that obtains energy by feeding on the bodies of dead organisms.
Decomposer
organism that breaks down and obtains energy from dead organic matter
Primary Consumer
consumer that feeds directly on producers
Secondary Consumer
An organism that eats primary consumers
Tertiary Consumer
An organism that eats secondary consumers
Succession
(ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established
Primary Succession
the series of changes that occur in an area where no soil or organisms exist
Secondary Succession
the series of changes that occur after a disturbance of an existing ecosystem
Abiotic
any nonliving component of an environment
Biotic
describes living factors in the environment
Organism
A living thing