How humans impact on species habitat
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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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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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