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Mass extinctions, then and now Essay Example

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Mass extinctions, then and now

That an interrelated ecosystem is prevalent and every species depends on others to lead their lifestyle and enhance the life expectancy and lead a proper lifestyle. Climate, atmosphere, land, agriculture are also highly dependent on the different operations of living organisms and can lead to certain amount of adversity as well as vulnerability due to actions that are taken by the same (Holsinger, 2013).Various researches conducted in the field of mass extinctions that was prominent in the history of the earth reflect on reckless mass extinction of global history. These extinctions were severe impact of nature that would already have altered a sensitive as well as interdependent ecosystem. Several amounts of differences that is prominent within the nature in regards to the causes of mass extinctions. The present nature of such scenarios could arise due to the diverse actions taken by human beings causing impact on the ecosystem (Keller, 2005).In the past years of earth’s history, which is predominantly known as the era of the Phanerozoic system, major extinctions were apparent pointing on risk of extinctions. During the previous years at the time of the mass extinctions the earth and ecosystem has evidences some enormous amount severity hinting towards mass extinctions. These extinctions have even made the ecosystem undergo enormous amount of changes and create a diverse impact on the overall life cycle of the species within the globe (Keller, 2005). Several issues has been predominant that has led to instances of extinctions in the previous eras. During the last 5 phases of mass extinctions there have been volcanic eruptions leading to loss of life of the entire organism that were living. Scientists are of the view that around 1000 species within the flora and fauna withered during preceding 500 years. The most important part of consciousness is that most of the species have gone extinct even before a detailed understanding about them could be developed. The major cause of such extinctions is identified to be changes in the ecosystem and climatic changes along with human actions (Centre for Biological Diversity, 2014).Observably, the world is at the verge of the 6th mass extinctions that could be an outcome of the intensive human actions rather than caused due to any other natural calamities that triggered the previous 5 mass extinctions. It is even noted that 99% of the human actions leads to destructions of the ecosystem and often they

References

Barnosky, A. D., Matzke, N., Tomiya, S., Wogan, G. O. U., Swartz, B., Quental, T. B., Marshall, C., McGuire, J. L., Lindsey, E. L., Maguire, K. C., Mersey, B. & Ferrer, E. A. (2011). Has the Earth’s sixth mass extinction already arrived? Review, 471, 54.

Butlin, R., Bridle, J., & Schluter, D. (2009). Speciation and patterns of diversity. Cambridge University Press.

Centre for Biological Diversity. (2014). The Extinction Crisis. Retrieved from http://www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis/

Holsinger, K. E. (2013). Introduction. Patterns of biological extinction, 2-15.

Keller, G. (2005) Impacts, Volcanism and Mass Extinction: Random Coincidence or Cause and Effect? Australian Journal of Earth Sciences, 52, 725-757.

Lande, R. & Mace, G. M. (1990). Population Viability Analysis and Extinction Factors. Assessing Extinction Threats: Toward a Reevaluation of IUCN Threatened Species Categories, 5(2), 149.

Mace, G. M. & Lande, R. (1990). Introduction. Assessing Extinction Threats: Toward a Reevaluation of IUCN Threatened Species Categories, 5(2), 149.

Myers, N. & Knoll, A. H. (2001). The Core Concept. The biotic crisis and the future of evolution, 98(10), 5389-5392.

Sodhi, N. S., Brook, B. W. & Bradshaw, C. J. A. (2014). Extinction Vulnerability. Causes and Consequences of Species Extinctions, 1, 515-519.

Stigall, A. L. (2012) Speciation collapse and invasive species dynamics during the Late Devonian “Mass Extinction”. Retrieved from http://www.geosociety.org/gsatoday/archive/22/1/pdf/i1052-5173-22-1-4.pdf

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preview essay on Mass extinctions, then and now
  • Pages: 6 (1500 words)
  • Document Type: Essay
  • Subject: Environmental Studies
  • Level: Undergraduate
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