Six mass extinctions: causes and consequences

Svorenji, Antonio (2015) Six mass extinctions: causes and consequences. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Mass extinctions are relatively short periods in geological time during which majority of species on Earth went extinct. They are characterised by a large magnitude and extinction rate and a very long period of recovery. Five mass extinctions and a few minor extinctions that occurred during the Earth's geological history are being defined. Main causes of these extinctions, such as volcanism are well known, but consequential factors like anoxia and climatic changes and their share in extinctions are questionable. Due to sudden changes in oceans, where life conditions are mostly constant, marine life was most severely affected by mass extinctions. Dominant and widespread groups of organisms like ammonites, trilobites and dinosaurs went extinct, thereby opening new ecological niches and giving a chance for evolution of other organisms. Many scientists warn us that because of great modern extinction rates, the sixth mass extinction has already begun. Many more researches and protection measures are required for reducing these rates and for securing the future of life on Earth as we know it.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Kovačević, Goran
Date: 2015
Number of Pages: 22
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 11 Mar 2016 10:50
Last Modified: 11 Mar 2016 10:50
URI: http://digre.pmf.unizg.hr/id/eprint/4585

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