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Understanding Human Impact on Habitats: Ecological Issues and Species Survival

Learn about how humans alter habitats, affecting species such as frogs, birds, and mammals. Discover the consequences of deforestation, overpopulation, and habitat loss, leading to ecological imbalances and extinctions. Explore the challenges of desertification and the urgent need for conservation efforts.

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Understanding Human Impact on Habitats: Ecological Issues and Species Survival

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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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