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Svifþörungar finnast aðallega í efra lögum sjávar þar sem sólarljóss er til staðar og eru þeir mikilvæg fæða fyrir smærri dýr sjávarins.
Helstu flokkar svifþörunga við Ísland eru kísilþörungar og skoruþörungar en einnig er að finna kalksvifþörungar í Eyjafirði sem geta fjölgað sér gríðarlega mikið við ákveðnar aðstæður og veldur því að sjórinn verður mjólkurhvítur á stórum svæðum.</gco:CharacterString>
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