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Population Ecology

Population Ecology. Populations of species are described by density, spatial distribution, and growth rate . Population Density. is the number of organisms per unit area Population density of cattle egrets is greater near the buffalo than farther away. . Spatial distribution.

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Population Ecology

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  1. Population Ecology • Populations of species are described by density, spatial distribution, and growth rate.

  2. Population Density • is the number of organisms per unit area • Population density of cattle egrets is greater near the buffalo than farther away.

  3. Spatial distribution • Dispersion is the pattern of spacing of a population within an area • 1 black bear/several hundred square kilometers • 4 bison/km2 • 10 deer/km2

  4. Population Growth Rate • Emigration is the term ecologist use to describe the number of individuals moving away from a population • Immigration is the term used to describe the number of individuals moving into a population

  5. Carrying Capacity • The maximum number of individual in a species that an environment can support for the long term

  6. Biodiversity • Biodiversity is the variety of life in an area that is determined by the number of different species in that area

  7. Genetic Diversity variety of genes or inheritable characteristics that are present in a population • Species diversity different species and the relative abundance of each species in a biological community • Ecosystem diversity variety of ecosystem that are all present in the biosphere

  8. Threats to Biodiversity • Mass extinction is when a large percentage of all living species become extinct in a relatively short period of time • Dinosaurs

  9. Natural resources are being destroyed or causing pollution. • Fossil fuels • Old growth forests • Nuclear Fuels • Habitat loss

  10. Overexploritation process of increase the current rate of extinction by excessive use, or species that have economic value • Ocelot • White rhinoceros • Black coral

  11. Biological magnification is the increasing concentration of toxic substances in organisms as trophic levels increase in a food chain • DDTpesticide used in the 1940s, responsible for the near extinction of the American Bald Eagle

  12. Eutrophication occurs when fertilizers animal waste, sewage or other substance rich in nitrogen and phosphorus flow into waterways. • Extensive algae growth • Fish Kills

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