Unformatted text preview: mall, that because of physical •
• characteristics of water, they have very little chance of sinking out of near surface waters.
For them, being in water is like being suspended in molasses. They won’t sink out.
Different strains of each of these genera are adapted to high light (near ocean’s surface) or low light (near bottom of euphotic zone at ca. 50150 m).
The euphotic zone is that part of the water column in which there is enough light for photosynthesis to take place (ca. upper 100 m of water in clear oceanic water). The abundance of these small cyanobacteria is highest in The abundance of these small cyanobacteria is highest in mid level depths of the euphotic zone where cells have pigments which can obtain energy from the abundant blue light that is present there and they can absorb nutrients which are depleted in surface water but abundant deeper.. In tropical seas, there are abundant multicellular In tropical seas, there are abundant multicellular cyanobacteria These are also prokaryotes and the most primitive of the phytoplankton • Trichodesmium (upper 2...
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- Fall '08
- Darwin, Phytoplankton, euphotic zone