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Population Ecology

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Population Ecology - PowerPoint PPT Presentation


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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
slide7

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
slide9

Natural resources are being destroyed or causing pollution.

    • Fossil fuels
    • Old growth forests
    • Nuclear Fuels
    • Habitat loss
slide10

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

    • Ocelot
    • White rhinoceros
    • Black coral
slide11

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
slide12

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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