Biology Lesson 10-Aquatic Ecosystems and Eutrophication - Aquatic Ecosystems and Eutrophication Aquatic ecosystems are those which are found in lakes

Biology Lesson 10-Aquatic Ecosystems and Eutrophication -...

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Aquatic Ecosystems and Eutrophication Aquatic ecosystems are those which are found in lakes and oceans. Like most land-based (“Terrestrial”) ecosystems, they have producers, consumers, and decomposers. Fig. 1—a typical lake ecosystem:
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One key factor for aquatic ecosystems is the degree to which sunlight can penetrate the water. Since water is MUCH more dense than air, the sunlight will only penetrate so deeply into a lake. The region of maximum penetration of sunlight is called the LIMNIC zone (see diagram above). Organisms can live below this region, but plants generally cannot live any deeper than this. In the lower regions of the lake, decomposers and bottom-dwelling organisms (Benthic organisms) tend to feed on dead organic material. In the absence of disturbances, aquatic ecosystems tend to become stable. However, the introduction of water pollution, in the form of agricultural run-off, can ruin an aquatic ecosystem through the process called EUTROPHICATION. It works like this:
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Stage 1:
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