UCSF 137 Lecture Notes - Lecture 12: Ecosystem Services, Osmosis, Ocean Acidification
11 May 2016
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Describe the impacts due to human alterations of landscapes/flow patterns: paving/landscape changes enhances flooding (more surface run-off filling streams/lakes, water management at luc. Explain overdrawing of water resources: overdrawing - humans withdraw water from lake/river/aquifer faster than it can be recharged. A. 1. cannot support water needs for human consumption/agriculture: other impacts w/overdrawing. B. 1. c) subsidence sink holes saltwater infusion (brackish water) Define water quality: what is water quality. Free of pollution quality of nutrients ph (neutral, 7: u. s. epa sets standards for water based on the intended use of water. Protected habitat agriculture: parameters of water quality. Affects biodiversity - ph, dissolved oxygen, conductivity (salt concentration), turbidity. Bioassessment - determines water quality quality based on biodiversity (# of species present, indicator species. Identify major water pollutants and their sources: top 5 causes impairment. Eutrophication - excessive nutrients in an ecosystem cause excessive growth in algae/phytoplankton and their eventual decomposition consumers oxygen from water (no oxygen = dead zone)
