MarineeutrophicationandRedtide-蔡明刚.ppt

Contents Introduction Part One Mechanisms in marine pollution Part two Topics in marine pollution Part three Measurement of biological response toxicity and water quality assessments …… Part two Topics in marine pollution Chap.2 Marine oxygen-demanded organic pollution Chap.3 Eutrophication and Red tide Chap.4 Oil pollution of the sea Chap.5 Marine synthetic organic pollution Chap.6 Heavy metal contamination in the sea Chap.7 Marine radioactivity pollution Chap.8 Marine heat pollution Chap.9 Other topics of marine polltion Chap.3 Eutrophication and Red tide 3.1 What is Eutrophication? (definition) 3.2 Why Should We Be Concerned? (harmful effect) 3.3 The nutrient in the coastal seawater 3.4 Eutrophication in the coastal seawater 3.5 Red tide What is Eutrophication? Eutrophication is a condition in an aquatic ecosystem where high nutrient concentrations stimulate blooms of algae (e.g., phytoplankton).------EPA The other definition the enrichment of water by nutrients especially compounds of nitrogen and phosphorus, causing an accelerated growth of algae and higher forms of plant life to produce an undesirable disturbance to the balance of organisms and the quality of the water concerned.“ —— by the European Commission Why Should We Be Concerned? Although eutrophication is a natural process in the aging of lakes and some estuaries, human activities can greatly accelerate eutrophication by increasing the rate at which nutrients and organic substances enter aquatic ecosystems from their surrounding watersheds. Agricultural runoff, urban runoff, leaking septic systems, sewage discharges, eroded streambanks, and similar sources can increase the flow of nutrients and organic substances into aquatic systems. These substances can overstimulate the growth of algae, creating conditions that interfere with the recreational use of lakes and estuaries, and the health and diversity of indigenous fish, plant, and animal populations. Pollution Fro