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Monday, January 10, 2011

Mutualism, Commensalism, Parasitism, and Competitive Relationships in Lakes

Mutualism - In nearly all lakes across the world, algae and fungi work together to form communities called lichens.

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A lichen community.
Commensalism - Many species of pondweed provide protection and shelter to numerous species of fish.

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A clear example of pondweed.
Parasitism - Icthyophirius multifilis, called "Ich", infects nearly all freshwater fish.

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The white dots are encrusted parasites.
Competitive relationship- Both freshwater snails and Anuran tadpoles feed on periphytic algae.

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Anuran tadpoles searching for food.

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