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Transcript
DO NOW Invasive Species 1. House sparrows from England were released in the U.S. They have competed with native bluebirds causing the bluebird population to decline. These sparrows are a ____________________ species 10 MINUTES NEMO POSTERS ARIZONA’S MOST WANTED Arizona’s Most Wanted stations and Invasive Species REVS At Each station fill in your chart about the invasive species You will have 3 minutes at each station CRAYFISH Complete the questions as a Think-Pair-Share http://www.pbs.org/video/2365636215/ EXIT TICKET 1. How can humans minimize their impact on the desert? 2. House sparrows from England were released in the U.S. They have competed with native bluebirds causing the bluebird population to decline. These sparrows are a ____________________ species 3. Crayfish are a non-native species, which means they are not a natural part of any of Arizona’s aquatic ecosystems. They compete for habitat and resources with sport fish, as well as with native fish, insects, frogs, snakes, turtles, and snails, and they ravenously consume submerged aquatic plants. What would be the result of introducing crayfish into an Arizona lake or river? DO NOW Silent Spring Bio-magnification and DDT DDT A BIT OF DDT HISTORY: During the World War II era, DDT was hailed as the "savior of mankind". The chemical had proved itself to be an efficient means of preventing diseases like malaria, associated with the mosquito. In its heyday, DDT was the most widely used insecticide of its time. Because DDT remains in its toxic state for years, farmers enjoyed many seasons of protection from a single spraying. (still around today) Upon discovering the housefly’s immunity to DDT, several scientists began to become skeptical of the actual safety of DDT. In 1946, two scientists, Elmer Higgins and Clarence Cottam, published an article about the hazardous affects of DDT on various animal species. The scientists concluded that DDT had a tendency to accumulate in the fatty tissue of certain animals. https://www.youtube.com/watch?v=Ipbc-6IvMQI HOW DOES DDT ENTER THE FOOD CHAIN? 1. DDT enters a food chain by entering the environment through water supplies 2. Producers absorb water and other abiotic factors that are contaminated 3. Consumers eat the producers As DDT goes up a food chain it can effect an animals health and ability to reproduce. An Example would be birds of prey that are exposed to DDT through the food chain have really thin eggshells that break before young birds have a chance to hatch BIOMAGNIFICATION The increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain. 1. How is this important for humans? 2. If DDT is used to kill certain insects, what might happen to other insects that are immune to it? 3. If DDT is used to kill insects, what happens to the rest of the food web if one species is removed? SILENT SPRING Written by American Author Rachel Carson Exposed DDT and its harmful effects leading to more awareness of human impacts on the environment. Explained bird shells and biomagnification 1. Close read the passage and answer the questions in complete sentences. DO NOW Clean Water act/ laws Sustainable Practices Clear Cutting Composting- recycling Strip mining/ habitat restoration SUSTAINABLE PRACTICES Sustainability Recycling Composting CLEAN WATER ACT Clean Water Act of 1977 is the primary law that protects our nations waters. Before 1977 there were little to no regulations on polluting water. Its objective is to restore and maintain the chemical, physical, and biological integrity of the nation's waters by preventing pollution, providing help to publicly owned water treatment sites for wastewater treatment, and maintaining the integrity of wetlands STRIP MINING Strip mining (also known as open cast, mountaintop or surface mining) involves scraping away earth and rocks to get to coal buried near the surface. In many cases, mountains are literally blasted apart to reach thin coal seams within, leaving permanent scars on the landscape as a result. Even though it's highly destructive, industry often prefers strip mining as it requires less labor and yields more coal than underground mining. Impacts of strip mining: 1. Strip mining destroys landscapes, forests and wildlife habitats at the site of the mine when trees, plants, and topsoil are cleared from the mining area. This in turn leads to soil erosion and destruction of agricultural land. 2. When rain washes the loosened top soil into streams, sediments pollute waterways. This can hurt fish and smother plant life downstream, and cause disfiguration of river channels and streams, which leads to flooding. 3. There is an increased risk of chemical contamination of ground water when minerals in upturned earth seep into the water table, and watersheds are destroyed when disfigured land loses the water it once held. A federal law requires mining companies to complete habitat restoration CLEAR CUTTING Clearcutting is a logging practice which involves completely clearing an area of trees, regardless of their size and usability. Remaining scrub and brush are usually burnt in large burn piles that can cast a smoky haze over the area for several days. 1. Causes habitat destruction for animals 2. Leaves no trees 3. River temperatures can rise without shade harming fish 4. Soil erosion and flooding occur because there are no tree roots left to keep water or soil in place. HABITAT RESTORATION Federal Laws EXIT TICKET 1. Clean water act question 2. Mining habitat restoration question 3. Plant tree monoculture- soil erosion question 4. When cities protect question PURPLE LOOSESTRIFE A very hardy plant which can rapidly destroy wetlands, lessening their value for wildlife habitat. Hundreds of species of plants, birds, mammals, reptiles, insects, fish and amphibians rely on healthy wetland habitat for their survival. However, when purple loosestrife gets a foothold, the habitat where fish and wildlife feed, seek shelter, reproduce and rear young, quickly becomes choked under a sea of purple flowers. Areas where wild rice grows and is harvested, and where fish spawn, are degraded. An estimated 190,000 hectares of wetlands, marshes, pastures and riparian meadows are affected in North America each year, with an economic impact of millions of dollars. RUSTY CRAYFISH Rusty crayfish are invasive crustaceans spreading to lakes, rivers, and streams in several areas of North America. They are more aggressive than other native crayfish, better able to avoid fish predation, and can harm native fish populations by eating their eggs and young. They can displace native crayfish, hybridize with them, and graze on and eliminate aquatic plants. Native to the Ohio River drainage, rusty crayfish have spread to several U.S. states and Ontario. They have likely spread through bait bucket release by anglers, aquarium release by hobbyists, activities of commercial harvesters, and live study specimen release by teachers and students who buy them from biological supply houses. DO NOW Sustainable Practices (gallery walk? Stations notes?) Clear Cutting/ Topsoil erosion Habitat restoration EXIT TICKET QUIZ