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abiotic
pertaning to the non-living components of an environemnt (e.g., light, temperature, nutrients)
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biomass
mass of organisms; standing crop
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biotic
pertaining to the organisms in an environment
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community
interacting populations of different species that occur in the same habitat
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competition
an interaction between two orgnisms that simultaneously require the same resource
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decomposer
organisms that obtain their energy and nutrietns by degrading organic matter
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ecological pyramids
a graphic representation of the trophic structure of an ecosystem in which numbers or biomass are represented in a pyramid, with the producer level forming the base and successive levels of consumers above it
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ecosytem
the organisms and non-living componets of the physical enivronment at a particular site
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food web
a graphic representation of the interconnected feeding relationships among organims in a community
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habitat
the physical space occupied by an organism
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niche
the ecological role of a species in an environment (characterized by both biotic an abiotic elements)
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predation
an interaction between organisms in which one organism (prey) is consumed by the other (predator)
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prey
an organism that is killed for food by another organism
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predator
an organism that kills other organisms for food
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priamary consumer
organisms for feed on prducers; herbivores
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producer
autotrophs; priamrly photosynthetic organisms that synthesize organic substances from inorganic materials
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secondary consumer
organism that eat other consumers; carnivores
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trophic level
position in the food chain
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trophic structure
the organization of a community based on the feeding relationships of the component populations
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