CAS ES 142 Lecture Notes - Lecture 3: Amnesic Shellfish Poisoning, Thermocline, Bioluminescence

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10/30: habs (harmful algal blooms) and the seasonal. Harmful algal blooms (habs) caused by phytoplankton: (cid:449)he(cid:374) phytopla(cid:374)kto(cid:374) are a(cid:271)u(cid:374)da(cid:374)t shade and block sunlight. Oxygen depletion (excessive respiration as microbes degrade the phytoplankton) Not caused by all types of phytoplankton certain phytoplankton have structures that irritate other organisms. *none of these three cause us actual physical harm. Different species of phytoplankton cause different hab ex: red tide found in freshwater and marine systems. Distribution in the us lots of different kinds of habs: happen all over the us. Red tide caused by dinoflagellates: single-celled, 2 flagelae, bioluminescent, can be in extreme high abundance 6-8 million per liter, most habs are caused by dinoflagellates but not all toxic can cause fish kills. Nuisance bloom algal bloom that causes negative consequences but it is not toxic vs. blooms that make a product that can cause poisoning (nausea, brain shrinkage)

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