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Eutrophication

in Lake Victoria

THANK YOU FOR LISTENING :D

By: Alex and Jill

Overview

Solutions

Problems and Consequences

  • Nutrient Limitation
  • uses phytoplankton
  • Algae filtration
  • remove nutrients and minerals
  • algae cannot give off necessary nutrients
  • plants die off
  • Ultrasonic irradiation
  • damages algae cells
  • Scientists are yet to discover more ways of fixing eutrophication
  • biodiversity loss, habitat destruction, death, taste, odour
  • WWF- native lake fish 80% down over 4 decades
  • over 60% people around live below the poverty line
  • Water with excessive nutrients is harder to filter- advanced technology required
  • Excessive nutrients in ecosystems
  • causes dense plant growth
  • Lack of oxygen for other aquatic species

Eutrophication Process

Environmental Perspective

  • occurs through fertilizers in water table and run-offs
  • causes phytoplankton to grow-algal bloom
  • oxygen decreases- animal life perishes
  • blocks sunlight- plant life dies
  • some algae produces toxins

Invasive Weed

Technological Perspective

  • known as water hyacinth
  • after 7 years, had taken up 80% of Uganda's shoreline
  • plants weave a dense mat over water
  • James Ogwang introduced south American Weevil
  • Main nutrient controller is phosporus
  • Scientists are currently developing new technology to remove phosphorus from water
  • the food web has been altered by non native organisms
  • they take away phosphorus from native species

Societal Perspective

  • countries surrounding the lake lack equipment and budget
  • no access to potable water and food
  • main food supply and way of making a living is fish- many fish die from the process
  • due to shortage, people turn to mining
  • harmful toxins make water undrinkable

Scientific Perspective

  • Eutrophication Explained
  • fertilizers -water table/ run-offs
  • cause rapid growth of phytoplanton - algal bloom
  • excess nitrogen and phosphorus
  • causes algal bloom
  • Excess of nitrogen and oxygen
  • algae feeds on

Algal Bloom

  • dead zones
  • emit toxins into water and air
  • not all are harmful
  • important to ocean food web
  • decaying depletes oxygen

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