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Ecological issues

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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Ecological issues

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  1. How humans impact on species’ habitat. Ecological issues

  2. 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

  3. 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 

  4. 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.

  5. 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.

  6. 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.

  7. 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

  8. 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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