Preserving Biological Diversity

Preserving Biological Diversity - Preserving Biological...

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Unformatted text preview: Preserving Biological Diversity Principles of Environmental Management Prof. Lisa Greenwood Objectives/Topics Define the following terms: • Natural extinction, accelerated extinction, endangered species, threatened species • Ecological islands, buffer zones, wildlife corridor and extractive reserve Causes of extinction, decline of biodiversity Reasons to protect diversity Significance of endangered species act Measures used to save endangered species and protect biodiversity Debt-for-nature swap option Personal actions that foster biodiversity Biodiversity: Signs of Decline • Many species face extinction • result of human activities • Not same as natural extinction • Modern extinctions are occurring faster than sustainable Biodiversity: Signs of Decline Natural Extinction: Natural process Evolutionary trend -gives rise to new species One species/1000 yrs Modern Extinction: Accelerated No evolution – species eliminated 100 species/day Thousands threatened or endangered • Frogs • bees Biodiversity: Signs of Decline Functional Extinction: The point of no recovery • Members too far apart to find mates or • Bank of genetic material too small – species unable to adapt to changes Causes of Extinction and the Decline in Biodiversity Contributing factors: 1. Destruction and alteration of habitat 1. Commercial harvesting Fig. 11.2 Habitat fragmentation all human activities alter the environment • change the biotic and abiotic conditions • fragment habitat #1 cause of species extinction • Resources inaccessible • Finding food more difficult • Populations separated • Available area decreased Physical Alteration of Habitat The most dramatic changes occur in biologically rich areas: • Tropical rain forests • Wetlands • Estuaries • Coral reefs • Tallgrass prairies • Temperate rainforests Physical Alteration of Habitat...
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Preserving Biological Diversity - Preserving Biological...

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