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This 2 page Class Notes was uploaded by Mallory McMullen on Friday March 27, 2015. The Class Notes belongs to 3401 at Ohio State University taught by Dr. Henkin in Fall. Since its upload, it has received 64 views. For similar materials see Biology in Biology at Ohio State University.
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Date Created: 03/27/15
Saturday March 28 y Ecotoxicology Module 2 Dr Lanno In a doseresponse curve we have to use really pure chemicals The response of an individual vs the population response Logistic 8 curve has a threshold where things start to change from baseline conditions ThreShOId 0f safetY first half of the curve where the effects are minimal Reversible Toxicity zone is the second half then irreversible when it levels out LD50 single dose that will kill 50 of subjects L050 means concentration EC50 concentration that will produce a specific effect eg immobility infertility in 50 of subjects Organisms are exposed to a range of concentrations and collect data of mortality survival and growth Incipient Lethal Level the asymptote to the yaxis that says the concentration where 50 will live indefinitely Best way to compare different chemicals Toxicity tests assume you can actually use the data to protect populations and that exposing animals to high doses are necessary Negative vs Positive Control testing the organism with no toxicant Only about 70 species are regularly used for toxicity assays You need organisms from each trophic level Animals with more fat are more affected by bioaccumulation Saturday March 28 y More efficient metabolisms get the toxin out of their system Bioconcentration Factor chemical in organismchemical in water Bioaccumulation Factor chemical in organismchemical in medium Acute vs Chronic toxicity tests that only examine less than 10 of an organism s lHespan KowOctanol Water Partition Coefficient determines relative lipid solubility A higher 3909 KOW means it s more likely to bioaccumulate Animals like beluga whales are especially susceptible to biomagnification because they get rid of toxins by passing them to their fetus Henry s Law solubility of a gas KH PCM The higher the constant the more volatile the chemical Sorption the physical complexation of a chemical with organic carbon directly related to KOW Rotifera small zooplankton with a cilial head and a muscular jaw eat algae bacteria and protozoans an important food source for larval fish
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