BSCI 363- presentation - o Greater amount of edge for the...

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BSCI 363 March 3, 2010 Habitat destruction, fragmentation, and degradation Habitat destruction - Primary cause of the loss of biological diversity. Results from the expansion of human populations and human activities - The most important means of protecting biological diversity is habitat protection Principal threats - Agricultures - Commercial development - Water projects - Outdoor recreation - Livestock grazing - Population infrastructure and roads - Disruptive of fire ecology - Logging Threatened habitats - Rainforests High biodiversity Easily damaged Cut down and burned for agriculture - Tropical deciduous forests - Grassland [97% of North American grasslands destroyed] - Wetlands and Aquatic habitats - Marine coastal areas [mangroves, coral reefs Habitat fragmentation - The process whereby a large, continuous area of habitat is both reduced in area and divided into two or more fragments - The differences from the original habitat
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Unformatted text preview: o Greater amount of edge for the area of habitat o The center of each fragment is closer to an edge o A formerly continuous habitat with large populations is divided into smaller areas with smaller populations Negative Effects of Habitat Fragmentation 1. Limits to dispersal and colonization 2. Restricted access to food and mates 3. Division of populations 4. Microclimate changes 5. Increased incidence of fire 6. Interspecies interaction 7. Potential for disease Habitat Degradation-Used in agriculture-Widely dispersed-Damage wildlife-Pert build resistance-Harmful in humans-Silent spring, Rachel Carson (1962) Water pollution-Pesticides-Sewage-Metals-Detergents Eutrophication-Nitrates-Algae-Bacteria-Dead zones Air pollution-Acid rain-Ozone and smog-Toxic metals Global climate change-Greenhouse gases-Global warming-Climate change...
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BSCI 363- presentation - o Greater amount of edge for the...

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