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DEAD ZONE (FACTS (UNOXYGENATED AREAS IN WATERWAYS, HYPOXIC AREAS IN OCEANS…
DEAD ZONE
FACTS
UNOXYGENATED AREAS IN WATERWAYS
HYPOXIC AREAS IN OCEANS AND LARGE LAKES
CAUSED BY EXCESSIVE NUTRIENT POLLUTION
MISSISSIPPI RIVER=>GULF OF MEXICO
NUTRIENT SPILLING FROM R MISSISSIPI
EUTROPHICATION=>EXCESS CO2=>LOWERS PH=>OCEAN ACIDIFICATION
SUMMER=>WARMING WATER=>ACCELERATES METABOLISM OF MICRO ORGANISMS
REASONS
NATURAL
COASTAL UPWELLING
CHANGES IN WIND AND WATER CIRCULATION PATTERNS
ANTHROPOGENIC
CHEMICAL FERTILIZERS=>INCREASE IN NUTRIENTS IN WATER=>EUTROPHICATION=>ALGAL BLOOM
RUN OFF FROM SEWAGE, URBAN LAND USE
HOW?
ALGAE OVERFED BY RUN OFF=>EUTROPHICATION=>REDUCES WATER QUALITY=>DEGRADES WATER
HYPOXIA
FORMATION OF ALGAE
NOT GOOD FOR ZOOPLANKTON AND FISH
ACCUMULATION IN WATER AND DIE AND DECOMPOSE
BACTERIAL DECOMPOSITION=>CONSUMES OXYGEN
CREATING HYPOXIA