BIOL 3450 Lecture Notes - Lecture 14: Algal Bloom, Photic Zone, Chemosynthesis
1 Dec 2014
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Document Summary
Lecture 6c coastal seas energy: primary production through photosynthesis is limited to the euphotic portion of the coastal sea: intertidal, shallow sea floor, surface layer of the sea. Chemosynthesis may also occur within benthic sediments: most energy is moved through the food web by detritus rather than herbivores, movement of energy in organic carbon goes through cpom and fpom. Hypothesis: only large grazers can consume large phytoplankton, and these large grazer populations grow slower than small grazers (longer generation time). This means that small zooplankton populations increase in abundance more quickly, and impose more rapid top-down control of small phytoplankton over large phytoplankton. Prediction: stronger top-down control by small zooplankton on small phytoplankton compared to large zoo and phyto: this idea is not well tested. 5 seasonal plankton patterns: 1) temperate n. atlantic pattern fall bloom, matched by pair of smaller zooplankton blooms (bottom-up control of zooplankton) Low light and deep mixing in winter means light is limiting (bottom-up control)
