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23 Cards in this Set
- Front
- Back
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Biodiversity
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The sum total of all organisms in an area, taking into account the diversity of species, their genes, their populations, and their communities.
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Species
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A population or group of populations of a particular type of organism, whose members share certain characteristics and can breed freely with one another and produce fertile offspring.
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Population
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All individuals of the same species that are occupying a specified area during a specific time
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Mass extinction
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The dying off of many species at once due to a catastrophic event.
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Species diversity
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The number and variety of species in the world or in a particular region
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Speciation
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-The process by which new species are generated
-Scientists have identified between 1.5-1.8 mil species of organisms. |
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Ecosystem
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All organisms and nonliving entities that occurand interact in a particular area at the same time.
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Extirpation
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The disappearance of a particular population from a given area, but not the entire species globally.
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Community
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A group of populations of organisms that live in the same place at the same time.
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Extinction
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The disappearance of an entire species from the face of the Earth.
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Biodiversity hotspots
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An area that supports an especially great diversity of species, particularly species that are endemic to the area
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BioDiversity Issues
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-Being lost to human impact
-Usually resulting in the extinction of one or more species -Species loss is increasing as our population growth & resource consumption is increasing |
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Extinction Facts
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-Extinction is a natural process
-When a species becomes extinct another wll form to fill the void -Scientists est. that approx. 99% of all species that have lived on earth are extinct -Earth has had 5 mass extinctions; many believe we are in the 6th and largest |
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Reasons for Biodiversity Loss
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-Extinction
-Habitat Alteration -Invasive Species -Pollution -Over-harvesting -Climate Change |
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Habitat Alteration
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Destruction & Fragmentation
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Invasive Species
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Exotic species not native to a particular environment with no natural predators
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Benefits of BioDiversity
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-Food
-Drugs & Medicine -Ecological -Aesthetic & Cultural benefits |
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How is BioDiversity in US protected?
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-US Endangered Species Act (1973)
-Purpose is to differentiate between endangered, threatened, and vulnerable species. |
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Conservation Biology
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A scientific discipline devoted to understanding the factors, forces, and processes that influence the loss, protection, and restoration of bio-diversity within and among ecosystems
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Genetic Diversity
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A measurement of the differences in DNA composition amont individuals within a given species
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Threatened Species
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Species likely to become endangered (at least locally) in the forseable future
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Vulnerable Species
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Species that is naturally rare or has been locally depleted by human activites to a level that puts them at risk
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Endangered Species
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Species present in such small numbers that it is at risk of extinction
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