Biodiversity Loss. Presented by Jim Jackson Debbie Lynch. Biodiversity Loss. CAUSES ETHICS SOLUTIONS. Yes, that is the Carolina Parakeet. Biodiversity Defined. Population Diversity Size of overall population Size and Numbers of local populations Distribution Genetic makeup
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Yes, that is the Carolina Parakeet.
Death rate > Birth rate
Hunted for profit/food
Hunted as a pest
Affects 49% of threatened or endangered species in America
10% of introduced species take, 10% of species that take become invasive
Linear relationship between diversity of species and landmass
If the earth was a single landmass, we would lose 66% of mammal diversity & 48% bird diversity
Ex: Cats vs. New Zealand ground birds
Competition & Habitat Alteration
Ex. Native Mediterranean White Duck vs. more numerous Ruddy Duck
Colonization of the Americas
Affects 85% of threatened or endagered species in America
Area the size of South America is planted with crops
175 billion pounds of nitrogen & tons of pesticide applied annually
Overharvesting => habitat loss
Species that live in a specific area are ENDEMICS.
Species that are capable of living in a variety of environments are GENERALISTS.
Endemics are more likely to be affected by change.
Keystone species are species that are crucial to the structure of the entire ecosystem. Without keystone species, ecosystems could not function well.
First Lady Laura Bush has begun to restore their Crawford Texas ranch with native species of grasses.
By restoring the native vegetation, Laura hopes to restore the natural habitat of a variety of species.
Methods of Preservation
Regulation of Land Use
Irian Jaya’s Reserve System
The Black Footed Ferret
With an extremely small population, these ferrets were captured in order to reestablish a viable population.
Cost/Benefits of Protecting Biodiversity