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Ecological issues

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Ecological issues - PowerPoint PPT Presentation


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How humans impact on species’ habitat. . Ecological issues. Overpopulation. 40% of the land is devoted to human food production 50% of the earth’s land has been altered by humans Nitrogen fixation is used by humans more than all of the other processes combined. Frog/Toad Populations.

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Presentation Transcript
overpopulation
Overpopulation
  • 40% of the land is devoted to human food production
  • 50% of the earth’s land has been altered by humans
  • Nitrogen fixation is used by humans more than all of the other processes combined
frog toad populations
Frog/Toad Populations
  • Frogs undergoing extinctions. Frogs create important chemicals for antibiotics.
    • Lots of species have already gone extinction
    • Why? The frog has permeable skin that is letting in the pollution in their bodies causing death and eggs not hatching.
    • The Panamanian Golden Frog extinct in the wild and only housed in conservatories (picture above)
    • Southern gastric brooding frog completely extinct

ddt and biomagnifications
DDT and biomagnifications
  • Sprayed on crops and ran off to oceans/streams/rivers
  • Plankton got contaminated and got eaten by a secondary consumer and that would get eaten by a tertiary consumer, then all were effected.
    • When it gets to bigger species it becomes more contaminated and built up in the fat tissue.
ddt in birds
DDT in birds
  • Birds eggshells thinning and causing birds to die.
    • Major decline of bald eagle, brown pelican, peregrine falcon and osprey
    • After the 40 years California Condors still affected because they feed on sea lions, still have continued thinned egg shell problems.
deforestation
Deforestation
  • Causes flooding, erosion and climate change
  • Caused by logging, cattle ranching and shifted cultivators.
  • New buildings in place of forests.
  • Only 8.6 acres of rainforest remain
  • Loss of habitat for creatures where 70% of animals live in forests and die without them.
habitat loss
Habitat Loss
  • Habitat loss causes about affect about 86% of threatened birds, 86% of mammals, and 88% of amphibians.
    • Some species include numbat, woma, Giant Gippsland earthworm
desertification
Desertification
  • Where a land dries out*bodies of waters* and turns into a desert/arid land.
  • Loss of vegetation
  • Lands become unsustainable/unlivable conditions.
                  • Causing animals to die due to dehydration.
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