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Essay about Amphibians

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Amphibian means “double life” referring to the fact that most adult amphibians live on land while embryos need water to survive. Some amphibians have been around since the Jurassic age; however the numbers of these long alive animals are declining around the world (Amphibia). As of 2010, 32% of the world’s 6600 amphibian species were threatened with extinction (Hayes, Falso, Gallipeau, Stice 2010). There is no single cause of the amphibian decline, but it seems that habitat loss, like deforestation, is the main reason along with human impact in terms of urbanization, forest fragmentation, predation, human exploitation, pathogens and climate change (Hayes, Falso, Gallipeau, Stice 2010). The climate is decreasing amphibians because of the increase of temperature, less rainfall, higher UV radiation levels and increases in pesticides. The declining population rate is also a factor; there is more death and reduced birth rates among amphibians. The amphibian population decline was considered a global phenomenon in the early 1990s and some experts consider this decline the Earth’s sixth mass extinction (Hayes, Falso, Gallipeau, Stice 2010).
One way to gather information about the amphibian decrease was done by the Global Amphibian Assessment or GAA. The GAA was the first-ever global assessment the amphibian conservation status and takes into account the 5,743 known species in the world, according to the GAA (AmphibiaTree). The results of the GAA are posted for public knowledge on the Amphibian Specialty Group Website (Animal Specialty Group). There is an assessment on the amphibian decline, including the Red List threat, the regions and ranges of certain amphibians, and general ecology information (AmphibiaTree). The GAA has stated t...


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...2003. The effects of adjacent land use on wetland amphibian species richness and community composition. Canadian Journal Of Fisheries & Aquatic Sciences,[cited November 30 2011] 60(9), 1078-1094.
Forman RTT, Alexander LE. 1998. Roads and their major ecological effects. Annual Revies , [cited December 2 2011](29), 207-231. Available from: doi: 10.1146/annurev.ecolsys.29.1.207
Leydig TF. 1992. Human impacts on genetic diversity in forest ecosystem. Oikos ,[cited December 1 2011] (63), 87-108. Available from: http://www.fs.fed.us/psw/publications/ledig/captured/psw_1992_ledig037.pdf
Hayes TB, Case P, Chui S, Duc C, Haeffele C, Haston K, Tsui M. 2006. Pesticide Mixtures, Endocrine Disruption, and Amphibian Declines: Are We Underestimating the Impact? Environmental Health Perspectives, [cited December 2 2011] 11440-50. Available from: doi:10.1289/ehp.8051



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Essay about Amphibians - Amphibian means “double life” referring to the fact that most adult amphibians live on land while embryos need water to survive. Some amphibians have been around since the Jurassic age; however the numbers of these long alive animals are declining around the world (Amphibia). As of 2010, 32% of the world’s 6600 amphibian species were threatened with extinction (Hayes, Falso, Gallipeau, Stice 2010). There is no single cause of the amphibian decline, but it seems that habitat loss, like deforestation, is the main reason along with human impact in terms of urbanization, forest fragmentation, predation, human exploitation, pathogens and climate change (Hayes, Falso, Gallipeau, Stice 2010)....   [tags: Ecology ]
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