An ecosystem is the totality of the environment encompassing all chemical, physical, geological and biological parts.

6/3/02


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An ecosystem is the totality of the environment encompassing all chemical, physical, geological and biological parts.

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Physical Factors Affecting Marine Life

The word žtrophicÓ refers to nutrition.

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Food webs

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As the primary producers, plants require sunlight, nutrients, water and carbon dioxide for photosynthesis.

Animals must consume pre-existing organic material to survive.

Bacteria are the decomposers; they break down organic material and release nutrients for recycling.

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Food chains transfer energy from one trophic level to another.

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Feeding Relationships

Primary production is the total amount of carbon (C) in grams converted into organic material per square meter of sea surface per year (gm C/m2/yr).

Compensation Depth

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Productivity varies greatly in different parts of the ocean in response to the availability of nutrients and sunlight.

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Primary productivity varies from 25 to 1250 gm C/m2/yr in the marine environment and is highest in estuaries and lowest in the open ocean.

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Author: Sean Todd

Email: someone@microsoft.com

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