________- increase in concentration of substances per unit of body tissue that occurs in successively higher trophic levels of a food chain or in a food web.
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Oligotrophic waterways
________- have low amounts of nutrients, stable algae populations, high dissolved oxygen.
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LD50
________- amount of a substance lethal to 50 % of a population.
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Cholera
________- cause: bacterial disease from infected water symptoms: diarrhea, vomiting, dehydration.
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Eutrophication
________- increase in nutrients in aquatic environments can lead to algal blooms-> algal bloom dies-> microbes digest algae and oxygen in the water-> decrease in dissolved oxygen levels-> large die offs of aquatic organisms.
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Plague
________- cause: bite of an infected organism or through contact with contaminated fluids symptoms: flu- like.
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Primary treatment
________- physical removal of large objects, often through the use of screens and grates, followed by the settling of solid waste in the bottom of a tank.
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Thermal pollution
________- occurs when heat released into the water produces negative effects to the organisms in that ecosystem.