Biology 3222F/G Lecture Notes - Lecture 4: Benthos, Bacterioplankton, Holoplankton
7 May 2019
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Origin of life life first evolved in water (oceans or salty volcanic mud) Last universal common ancestor believed to exist in enviro similar to hydrothermal vents. Use h, no o2, high temp, rich in sulfides, metals. Luca bac archaea eukaryotes (others that have evolved from that) Nekton: organisms that can swim in water independently of currents. Plankton: wonder with ocean current, some can control where they go (up/down) but horizontally is dictated by ocean current: phytoplankton: plankton that undergo photosynthesis (primary produce-take inorganic to organic materials) Multicellular: bacterioplankton: bac/archaea, does primary production as well. Dominant phytoplankton: diatoms: unicellular, glass wall (silica), cylinder, euk, dinoflagellates: shell (cellulose), spikes and have flagella, euk, cyanobacteria: membrane bound chloroplast (bac) Meroplankton: plankton that are one part life stage as planktonic (usually larvae stage) Epifauna: live on the surface, free moving along the see floor.
