Illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web.

Total amount of living tissue within a given trophic level. The total mass of all living material in a specific area, habitat, or region.

Biogeochemical cycles

Process in which elements, chemical compounds, and other forms of matter are passed between living organisms and the physical environment. *As a matter is recycled, it is often transformed, but never created nor destroyed.*

Chemical substance that an organism needs to sustain life.

Process of converting nitrogen gas into nitrogen compounds that plants can absorb and use.

Process by which bacteria convert nitrates into nitrogen gas (N2), in which the nitrate is reduced or removed from soil, water, or air.

Removes fixed nitrogen from ecosystems and converts it back into atmospheric (N2). *When a plant or animal dies, decomposers like fungi and bacteria turn the nitrogen back into ammonium so it can reenter the nitrogen cycle.*

Single essential nutrient that limits productivity in an ecosystem and the available quantity of this nutrient controls the pace at which organisms are produced.

An increase in the limiting nutrient shows an increase in the growth of organisms in the ecosystem. *The limiting nutrient that maintains the delicate balance of the ecosystem.*

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Biology Chapter 3C

Part 3 of Chapter 3 Vocab.

Term	Definition
Ecological pyramids	Illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web.
Biomass	Total amount of living tissue within a given trophic level. The total mass of all living material in a specific area, habitat, or region.
Biogeochemical cycles	Process in which elements, chemical compounds, and other forms of matter are passed between living organisms and the physical environment. As a matter is recycled, it is often transformed, but never created nor destroyed.
Nutrients	Chemical substance that an organism needs to sustain life.
Nitrogen fixation	Process of converting nitrogen gas into nitrogen compounds that plants can absorb and use.
Denitrification 1	Process by which bacteria convert nitrates into nitrogen gas (N2), in which the nitrate is reduced or removed from soil, water, or air.
Denitrification 2	Removes fixed nitrogen from ecosystems and converts it back into atmospheric (N2). When a plant or animal dies, decomposers like fungi and bacteria turn the nitrogen back into ammonium so it can reenter the nitrogen cycle.
Limiting nutrient	Single essential nutrient that limits productivity in an ecosystem and the available quantity of this nutrient controls the pace at which organisms are produced.
Limiting nutrient 2	An increase in the limiting nutrient shows an increase in the growth of organisms in the ecosystem. The limiting nutrient that maintains the delicate balance of the ecosystem.

Created by: Sammygaga

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