Population ecology
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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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Presentation Transcript
Population ecology
Population Ecology

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


Population density
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
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


Population growth rate
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


Carrying capacity
Carrying Capacity

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


Biodiversity
Biodiversity

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


  • 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


Threats to biodiversity
Threats to Biodiversity

  • Mass extinction is when a large percentage of all living species become extinct in a relatively short period of time

    • Dinosaurs



  • Overexploritation process of increase the current rate of extinction by excessive use, or species that have economic value

    • Ocelot

    • White rhinoceros

    • Black coral


  • 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


  • 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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