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Bacillariophyta—the diatoms

Bacillariophyta—the diatoms

Bacillariophyta—the diatoms

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Ecology of dinoflagellates<br />

Can be very important primary producers in both lakes and oceans<br />

Many dinoflagellates occur as symbionts inside animals eg corals or sponges<br />

Can cause toxic blooms, eg red tides, usually in estuaries—shellfish poisoning<br />

Very motile can usually maintain their position in the water column if they remain<br />

near the thermocline where turbulence is not too great<br />

Can produce bioluminescence in response to disturbance of the water column or<br />

predators.<br />

Many species are heterotrophic and mainly live by ingesting bacteria (phagocytosis),<br />

many such species have little chlorophyll.

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