The greener the better? A boy swims in algae-covered waters off the coast of Qingdao, China, in 2011 fingers of sediment and green swirls of algae are visible in Lake Erie on March 21, 2012. fingers of sediment and green swirls of algae are visible in Lake Erie on March 21, 2012. A boat motors through a 2011 algae bloom on Lake Erie near Toledo, Ohio fingers of sediment and green swirls of algae are visible in Lake Erie on March 21, 2012. A boat motors through a 2011 algae bloom on Lake Erie near Toledo, Ohio Two people row their way across algae-infested fingers of sediment and green swirls of algae are visible in Lake Erie on March 21, 2012. A boat motors through a 2011 algae bloom on Lake Erie near Toledo, Ohio Two people row their way across algae-infested A fisherman cups algaechoked water from Algal bloom – pond Kolíňany A seagull stands a red algae bloom discolouring the water at Sydney's Clovelly Beach, 2012 Algal bloom An algal bloom is a rapid increase in the density of algae and other plants in an aquatic system. Algal bloom An algal bloom is a rapid increase in the density of algae and other plants in an aquatic system. can occur when a combination of suitable environmental conditions exist for abundant algal growth -increased nutrients (nitrogen, phosporus) -warmer temperature -abundant light -stable wind conditions Eutrophication Eutrophication is a type of water pollution caused by increasing level of nutrients in bodies of water Eutrophication Eutrophication is a type of water pollution caused by increasing level of nutrients in bodies of water Algal bloom is a symptom of eutrophication Farm workers spread fertilizer pellets on wheat fields in China in 2011 Aquaculture ponds, such as these channel catfish production ponds, typically contain high concentrations of nutrients, such as nitrogen and phosphorus, due to regular feeding of the fish. Around the world, and in commonly developing countries, wastewater is discharged directly into surface water bodies Bacteria decompose dead org. Plants die 1 Bacteria decompose dead org. Plants die 1 2 Bacteria decompose dead org. Plants die 3 1 2 3 Plants die Bacteria decompose dead org. 3 1 2 3 Plants die 4 Bacteria decompose dead org. 3 1 5 2 3 Plants die 4 Bacteria decompose dead org. 3 6 1 5 2 3 Plants die 4 Bacteria decompose dead org. 3 6 1 5 2 3 Plants die 4 Bacteria decompose dead org. 3 6 1 5 2 3 Plants die 4 Bacteria decompose dead org. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. 2. Extra nutrients cause increased growth of the aquatic plants/algae – this is known as an algal bloom. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. 2. Extra nutrients cause increased growth of the aquatic plants/algae – this is known as an algal bloom. 3. The algal bloom covers the water’s surface killing any plants below the surface as light and oxygen cannot reach them. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. 2. Extra nutrients cause increased growth of the aquatic plants/algae – this is known as an algal bloom. 3. The algal bloom covers the water’s surface killing any plants below the surface as light and oxygen cannot reach them. 4. Algae also die as the nutrients run out. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. 2. Extra nutrients cause increased growth of the aquatic plants/algae – this is known as an algal bloom. 3. The algal bloom covers the water’s surface killing any plants below the surface as light and oxygen cannot reach them. 4. Algae also die as the nutrients run out. 5. Aerobic bacteria decompose the dead plants and use up oxygen for respiration. Process of Eutrophication 1. Sewage or fertiliser run-off and leaching increases the nutrient concentration of the water. 2. Extra nutrients cause increased growth of the aquatic plants/algae – this is known as an algal bloom. 3. The algal bloom covers the water’s surface killing any plants below the surface as light and oxygen cannot reach them. 4. Algae also die as the nutrients run out. 5. Aerobic bacteria decompose the dead plants and use up oxygen for respiration. 6. Fish and other organisms die from a lack of oxygen. Harmful effects of algal bloom https://oceanservice.noaa.gov/facts/habharm.html Harmful effects of algal bloom Harmful effects of algal bloom https://oceanservice.noaa.gov/facts/habharm.html Algal blooms can be toxic. Keep people and pets away from water that is green, scummy or smells bad. Some algae produce toxins that can be passed to other levels of food chain Harmful effects of algal bloom Direct skin contact with harmful algae can cause skin and eye irritation. Inhalation of fine spray or droplets from algae-affected water can cause mild respiratory effects and symptoms similar to hay fever. (This most commonly occurs during swimming, water-skiing, jet-skiing and boating.) Drinking or consuming harmful algae affected water or consuming food (such as fish or shellfish) containing toxins can lead to gastroenteritis, which can induce vomiting, diarrhoea, fevers and headaches. These toxins may also affect the liver or nervous system. Vodný kvet – rybník Kolíňany A dead African buffalo (Syncerus caffer) found in a reservoir with a dense bloom of the toxic cyanobacterium Microcystis at the Loskop Dam Nature Vodný kvet – rybník Kolíňany Reserve in South Africa. sources https://www.nationalgeographic.com/science/article/130423-extreme-algaebloom-fertilizer-lake-erie-science https://5.imimg.com/data5/SELLER/Default/2021/12/RE/SE/CL/9405890/la wn-grasses-500x500 https://www.scicell.org/2020/08/12/sinice-a-ich-metabolity/ https://www.nature.com/scitable/knowledge/library/eutrophication-causesconsequences-and-controls-in-aquatic-102364466/ https://quizlet.com/291485834/eutrophication-diagram/ https://www.bbc.co.uk/bitesize/guides/z8fypbk/revision/3 https://www.tahoedailytribune.com/news/toxic-algae-prompts-dangerwarning-at-indian-creek-reservoir/
