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Transcript
Human Impacts on the Biosphere Learning Targets I can: • Explain effects of human population growth, habitat alteration, introduction of non-native species, pollution and overharvesting on the biosphere in North Carolina. • Explain effects of invasive non-native species on a North Carolina ecosystem. • Summarize ways to mitigate human impact on the biosphere. Why is biodiversity so important? • Biodiversity has an intrinsic value that is worth protecting regardless of its value to humans. This argument focuses on the conservation of all species, even if they are ecologically equivalent species. • Biodiversity performs a number of ecological services for humankind that have economic, aesthetic or recreational value. • Global Biodiversity Outlook - 2010 Human population growth Habitat Alteration- The 21 Most Endangered U.S. Ecosystems (red = North Carolina) 1. South Florida Landscape 2. Southern Appalachian Spruce-Fir Forest 3. Longleaf Pine Forest and Savanna 4. Eastern Grasslands, Savannas, and Barrens 5. Northwestern Grasslands and Savannas 6. California Native Grasslands 7. Coastal Communities in the Lower 48 States and Hawaii 8. Southwestern Riparian Forests 9. Southern California Coastal Sage Scrub 10. Hawaiian Dry Forest 11. Large Streams and Rivers in the Lower 48 States and Hawaii 12. Cave and Karst Systems 13. Tallgrass Prairie 14. California Riparian Forests and Wetlands 15. Florida Scrub 16. Ancient Eastern Deciduous Forest 17. Ancient Forest of Pacific Northwest 18. Ancient Red and White Pine Forest, Great Lakes States 19. Ancient Ponderosa Pine Forest 20. Midwestern Wetlands 21. Southern Forested Wetlands Noss, R. F., and R. L. Peters. 1995. Endangered ecosystems: a statusreport on America's vanishing habitat and wildlife.Defenders of Wildlife. Habitat alteration-N.C. example • Mount Mitchell; Spruce-fir forest above 5500’ • Second most endangered ecosystem in U.S. • Major Threats: – Climate change – Invasive species (balsam wooly adelgid) – Pollution (Acid rain, snow & fog) Invasive species-Mountain ecosytem • Balsam wooly adelgid; introduced in 1908 from central Europe. • Vast stands of spruce-fir forests in U.S. have been destroyed by this invasive pest. Invasive species-Piedmont ecosystem • • KudzuIntroduced in 1900 from Japan. Out-competes many other native plants. Invasive species-Coastal ecosystem • Hydrilla-Invasive aquatic plant. Introduced in 1960 through the aquarium trade. • Grows in dense mats that interfere with wildlife habitat. • North Carolina meets the federal standards for four criteria pollutants under the Clean Air Act: – – – – Nitrogen Dioxide, Sulfur Dioxide, Lead, and Carbon Monoxide Pollution • North Carolina exceeds the federal standard for ground-level ozone. Ozone at the ground forms when man-made pollutants combine in a chemical reaction driven by sunlight and heat. • Ozone exposure can trigger respiratory difficulties, including a tight feeling in the chest, difficulty drawing a deep breath, throat and eye irritation, and coughing. Ozone can trigger asthma attacks. Some health experts describe the effects of breathing ozone as "a sunburn inside the lungs". • Ozone pollution can damage plant tissues, reducing growth rates and agricultural yields. Daily Ozone Forecast for NC Water Pollution Nutrient pollution in the form of Nitrogen Oxide contributes to algal blooms, reduced oxygen content of water, and fish kills. Overharvesting • In North Carolina, overharvesting of oyster beds has led to shortages.