Bio 102 Unit 4 Week 2 Notes
Bio 102 Unit 4 Week 2 Notes Bio 102
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This 3 page Class Notes was uploaded by l_welden on Sunday April 24, 2016. The Class Notes belongs to Bio 102 at University of Tennessee - Knoxville taught by Dr. Jeremy Chandler in Spring 2016. Since its upload, it has received 12 views. For similar materials see Introduction to Biology in Biology at University of Tennessee - Knoxville.
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Date Created: 04/24/16
Day 3 I. Possible causes of CCD 1. Climate Change 2. Pesticides (neonicotinoidspossible link) 3. Habitat loss 4. Parasites/Predators (giant hornets) 5. Viruses A. Climate Change: could influence many variables on the list B. Pesticides: insect takes it in through pollination and then the pesticide attacks the central nervous system of the honeybee People sprayed mass amounts of DDT Paul Muller showed it was an effective insecticide Rachel Carson (Silent Spring) birds affected by DDT and died after eating worms affected by DDT, the worms ate the DDT from tree leaves that fell in the dirt DDT works by targeting the nervous system of many insects DDT impacted all organisms in ecosystems overtime, if you eat a lot of organisms with DDT, it affects people and bigger animals Bans/controls on pesticides and other chemicals after Silent Spring is published in 1960’s Substainability: use of Earth’s resources in a way that will not permanently destroy or deplete them o Biocapacity: ability to sustain human demand given available Resources Mesaured in global hectares (gha) – the biological productivity of an average hectare ( about a soccer field) Earth has an estimated 12 B gha available; about 1.8 per person, but we use 2.8 per person on average currentlyUS has a larger footprint than most world populations o Natural Resources: raw materials that are obtained form Earth and are considered valuable even in their relatively unmodified state o Ecological Footprint: Collective demand placed on natural resources Measure of how much land and water is required to supply the resources a person or organism uses o Nonrenewable resources o Pollution air or water pollution is a contributing factor in declining populations o Acid Rain Kills microbes Poisons plants Metals Kills fish o Goal of Stubstainable Development o LEED certification Substainable materials Greensburg has one of the highest per captita of LEED buildings Day 4 I. Sustainable By Design A. Technology 1. Smart Grid nuclear power, thermal power, hydraulic power, photovoltiac, wind generator things that use are ecological vehicles, cities/offices, homes, factories 2. Smart meters 3. Longevity: can we recycle old products into green sources 4. Things wrong with renewable sources: No solar power because expensive, uses hazardous chemicals, and bad ones have to be disposed of Windmills affect birds, environment, expansive and expensive can we rearrange them to make them ecologically friendly and cheaper? Nuclear : what do we do we nuclear waste Biomass Supplies: we take carbon dioxide out of the air that plants use no net gain of carbon Wind/Solar power technologies are currently more expensive than those based on oil, coal, and natural gas Carbon offset: you somehow offset the carbon you produce with something that will negate remaining CO2 emissions instead of trees, we can use algae blooms and microscopic organisms that are photosynthetic If we do not figure out how to regulate fuels, we risk having a boom or bust in human population B. Biodiversity 1. Loss of Biodiversity extinctions in line with this 2. Biodiversity matters because: Expanding human population threatens biodiversity and the loss of natural ecosystems Healthy ecosystems: purify air and water, decompose wastes, and recycle nutrients Wetlands: buffer coastal populations against hurricanes, reduce impact of flooding rivers, filter pollutants Estimated average animal value of ecosystem services each year in the US is more than 33 trillion 3. Biological diversity includes genetic, species, and ecosystem diversity Genetic diversity: raw material that makes microevolution and adaptations to the environment possible we can combat the loss of diversity in plants with the Svalbard seed vault, which houses seed from around the world in Norwayhowever, we have no guarantee that they will germinate Species diversity: o Victims of humancaused extinctions Chinese River Dolphin Hawaiian Crow Northern White Rhino 4. Causes of Declining Biodiversity Habitat destruction and fragmentation o Agriculture o Urban Development o Forestry o Mining – ex. Strip mining o Theodore Roosevelt – responsible for organization of national parks (1 one was Yellowstone in 1872) do we need to regulate national park attendance to avoid overexploitation?) Invasive species o Competed with native species o Preyed upon native species o Parasitized native species o Often better competitors for food o Ex. Cane Toad originally from S. America and brought to Australia in efforts to control the cane beetle, but they did not and have been a nuisance since Overexploitation Pollution
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