25_zooplankton - Zooplankton GS222 Lecture25...

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Zooplankton GS222 Lecture 25
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Overview - this lecture Previous lecture review Types of zooplankton: holoplankton  (foraminifera) and meroplankton Gelatinous holoplankton: siphonophores,  possible role in physical mixing
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14_15 Diatoms Dinoflagellates Coccolithophore
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Diatoms Photosynthetic unicellular algae  (phytoplankton). Secrete silica shell  Prefer high nutrients so found in  upwelling regions Very common in Southern Ocean,  with high silica surface waters Capable of producing massive  blooms
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Coccolithophores Most are nanoplankton (5-20  μ m) Unicellular marine algae (phytoplankton) Form higher proportion of phytoplankton  biomass in non-productive temperate and  tropical ocean waters Have hair-like flagella used for locomotion Armored by calcium carbonate plates, so they  are typically preserved in sediments
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Prochlorococcus Encompasses an entire genus of bacteria Tiny picoplankton (~0.5  μ m diameter), discovered in the 1980s  May be the most abundant type of  phytoplankton in tropical and  subtropical oceans Contributes 30-80% of photosynthesis  in low nutrient environments Is capable of fixing N 2  gas into  bioavailable form of nitrogen,  nitrate (NO 3 - )
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Zooplankton Planktonic animals (heterotrophs), 2 types: 2) Holoplankton
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25_zooplankton - Zooplankton GS222 Lecture25...

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