Lecture4Phytoplankton

Lecture4Phytoplankton - Phytoplankton These organisms form...

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Introduction to Biological Oceanography (3): John Cullen Phytoplankton These organisms form the base of major food webs in coastal and open ocean environments. They are THE MOST IMPORTANT organisms on Earth. (Ok, so I’m biased)   Chaetoceros
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Introduction to Biological Oceanography (3): John Cullen Phytoplankton “drifting plants” single cells or chains of cells may have flagella Very often classified by size (why?) Picoplankton (< 2 μ m) Nanoplankton (2-20 μ m) Microplankton (20-200 μ m) Karenia brevis
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Introduction to Biological Oceanography (3): John Cullen Main groups of phytoplankton; differ in structure, size and pigment composition *Cyanobacteria * Diatoms Dinoflagellates Prymnesiophytes (Haptophytes) Prasinophytes Chrysophytes Raphidophytes * Chlorophytes (Green Algae) Cryptophytes *Benthic forms are common Eukarya
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Introduction to Biological Oceanography (3): John Cullen Cyanobacteria : Main players in the pelagic environment are: Synechococcus Prochlorococcus Trichodesmium Picoplankton Net plankton Note genus name is capitalized and italicized or underlined
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Introduction to Biological Oceanography (3): John Cullen Picoplanktonic Cyanobacteria Smallest of the plankton (< 2 μ m), but numerous (100,000 cells per ml or more) so they contribute substantially to global primary production Contributions recognized mid 1970’s (why?) Autotrophs, contain photosynthetic pigments
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Picoplanktonic Cyanobacteria Main genera are Synechococcus and Prochlorococcus •Fluoresces orange when hit with green light ; contain chl a and phycoerythrin •Discovered in 1979 (Waterbury et al. 1979) •Very small (ca. 1-2 µm) •Counted with epifluorescence microscopy or flow cytometry •Often dominate primary production in open ocean regions Prochlorococcus •Divinyl chl a and chl b •Discovered in 1988 (Chisholm et al. 1988)
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Lecture4Phytoplankton - Phytoplankton These organisms form...

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