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10 Cards in this Set
- Front
- Back
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Two components Species Diversity
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SPECIES RICHNESS- number of species in a community.
RELATIVE ABUNDANCE- proportional representation of a species in a community. |
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Keystone Species
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Occupies a niche that holds the community together. Ex: loss of sea lions led to more sea urchins, led to them eating away kelp forests.
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Natural disturbance
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Fires, storms, floods, droughts
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Human Disturbance
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Most significant agents of disturbance. Hunting in primitive areas, pick up a virus. Ebola.
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Primary Succession
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Disturbances that leaves only bare ground Ex: Lava fields, Glaciers
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Secondary Sucession
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Destroys existing community but leaves the soil intact.
Ex: Floods, Fire |
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Biodiversity
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The variety of living things; includes genetic diversity, species diversity, and ecosystem diversity.
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Threats to Biodiversity
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1. Habitat Destruction 2. Habitat degradation (pesticides,pollution)
3. Overexploitation of species (over hunting bison) 4. Invasion of Exotic Species (zebra mussels) |
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Competitive Exclusion principle
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Populations of two species cannot coexist if their niches are nearly identical. One population will eventually outcompete and eliminate the other.
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Organism's Niche
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the way the organism uses the range of physical and biological conditions in which it lives. Ex: Role of vultures is to feed on dead bodies, as scavengers.
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