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Important reminders • Your fieldwork hours and write ups are due TODAY. • For Period 6 only, tomorrow is the last day to turn in make up work. For period 5, deadline is today. • If you have any discrepancies / questions about your grade, come see me tomorrow during nutrition or lunch. Notes #2: Sustaining Aquatic Biodiversity Chapter 12 I. Case Studies • A. Lake Victoria • Originally - huge amounts of biodiversity • Loss in Biodiversity • Introduction of Nile Perch • Algal blooms, water hycinths increase due to fertilizer runoff eutrophication • B. Florida Everglades • • • • • Nutrient pollution Channelization, concrete Canals & levees US Army Corps of Engineers - 30 yrs, $8.4 billion Trying to reverse all of these C. Eutrophication • • • • • • • 1) high nitrate / phosphate levels (fertilizer) 2) increase in aquatic producers (algae) 3) nitrate & phosphate levels drop 4) light blocked out 5) algae die 6) bacteria decompose (eat) dead algae 7) bacteria respire and remove oxygen from water • 8) respiring organisms don’t have enough oxygen and die II. Human Impacts • A. Overfishing • 1) drift net: • huge, weighted nets hang 2,500 m • Catch more than target fish • 2) trawler fishing • huge, weighted nets dragged • Damage ocean floor • B. Pollution • 1) nitrogen = eutrophication • 2) trash, plastics, mercury etc. • C. Invasive Species • 1) Nile Perch in Lake Victoria • 2) Zebra Mussels in Great Lakes • D. Habitat Loss • 1) Coral reefs • 2) Everglades III. Solutions • • • • • • A) Integrated Coastal management Communities Identify problems / goals Develop solutions B)Marine Sanctuaries Marine protected areas • Legal • CITES & Endangered Species Act • Marine Mammal Protection Act • • • • Maximum Sustainable Yield Freduce fishing subsidies Consumer info (label) Bycatch • Wide meshed nets, escape devices • Aquaculture • Fish farms, herbivorous, control pollution • Ballast • Kill, filter, dump Time for Quiz #5 • Clear your desks of everything except for a pen or pencil. • Two forms. • Please alternate forms. • You may write directly on the sheet. • You have the rest of the period.