BIOL 336 Lecture 10: February 6th 2017
7 Feb 2017
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Document Summary
Based on the distinct features of their organic and mineralized scales: planktonic, marine, ecological interest: bloom-forming taxa, sampling: Bottom: sediment cores: we have non-calcifying haptophytes and calcifying, defined by the presence of a haptonema. Mostly marine (brackish), also in freshwater lakes. Short haptonema and unequal flagella: coccolithophyceae. Large gelatinous colonies (up to 8mm in diameter) or unicellular flagellates. In colonies, cells lack scales and haptonema, and are embedded in polysaccharide mucilage that serves as: energy reserve, reservoir for po4 and trace metals (eg. fe, mn, buoyancy. Extensive blooms in temperate and polar oceans (eg. north sea, southern ocean) Can produce 10% of the total global flux of dma to atmosphere. Some marine species: toxins that kill fish) Freshwater forms: odor production and tadpole deaths. Originates ~278,000 years ago, acquired the ability to form blooms 85,000 years ago, and has been a dominant member of the phytoplankton for the past 73,000 years.
