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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online