Phytoplankton Bloom, Baltic Sea, 2005 Massive
congregations of greenish phytoplankton swirl in the dark water around
Gotland, a Swedish island in the Baltic Sea. Phytoplankton are
microscopic marine plants that form the first link in nearly all ocean
food chains. Blooms of phytoplankton, occur when deep currents bring
nutrients up to sunlit surface waters.
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