Permian/Triassic extinction event:
The Permian/Triassic extinction event occurred approximately 252 million years ago, it is the most devastating known extinction event, eradicating up to 96% of all marine species and 70% of land dwelling creatures, its aftermath left earth with a significantly decreased biodiversity, resulting in a slow recovery of life, over 10 million years.
Marine creatures, suffering a 96% decrease in species diversity was the major group of organisms which suffered the most, due to a variety of reasons, one being the ocean acidification after an increase in carbon dioxide which affects the ability to create skeletons, as well as preventing proper breathing. evidence of the eradication of marine creatures was found in samples from south China sections at the Permian-Triassic boundary, the final two sedimentary zones show the disappearance of “286 out of 329 marine invertebrate genera” ("Pattern of Marine Mass Extinction Near the Permian–Triassic Boundary in South China"). Shallow warm-water marine invertebrates, which included trilobites, corals, and two large groups of echinoderms; blastoids and crinoids, show the greatest losses during the Permian extinction. However, the surviving marine organisms experienced a radiation in genetic diversity over the 10 million year recovery period, creatures such as: brachiopods, ammonites and crinoids.
Terrestrial organisms suffered a 70% loss of life, severe, but not quite as large as marine creatures. Invertebrates suffered, as the Permian/Triassic event is the only known mass extinction of insects, eradicating 8 or 9 orders, and greatly reducing the diversity of 10 more. Evidence indicates that over two thirds of amphibians, reptiles and mammal like reptiles be...
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...mans were in harmony with the landscape. For example, in 1998 David Bowman, an ecology argued that the early aboriginals did not have the population density or the technology to efficiently wipe out megafauna. Though, new evidence based on dating of megafaunal remains suggests that humans were the ultimate cause of the extinction of megafauna in Australia. The dates derived show that all forms of megafauna on the Australian mainland became extinct in the same rapid timeframe — approximately 46,000 years ago — the period when the earliest humans first arrived in Australia.
Climate change and removal of food sources and inability to sustain their large form
but these arguments have to account for the fact that megafaunal species comfortably survived two million years of climatic oscillations, including a number of arid glacial periods, before their sudden extinction.
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- The Permian Triassic Mass Extinction The Permian Triassic extinction was an event of cataclysmic disaster and almost the extinction of all species on planet earth. The Permian Triassic extinction is said to have occurred millions of years ago, geologist have estimated that its occurrences happened about 248 million to 286 million years ago. This rare occurrence of events proceeded the Triassic geologic periods and the Paleozoic and Mesozoic eras. This mass disaster was the largest dissipation of living life on planet earth; it is believed to be even superior to other crises such as the Ordovician and Devonian events and the conclusion of the cretaceous era that came upon the dinosaurs.... [tags: Geology, Disaster]
581 words (1.7 pages)
- Introduction The Permian-Triassic extinction event is undoubtedly the largest extinction event the Earth has ever seen. While evidence shows that it occurred over a great amount of time, it was effective in causing the extinction of an incredibly large portion of life on Earth. To such an extent that it took millions of years before any large amounts of biodiversity occurred again. This is why it is also referred to as the ‘Great Dying’. This paper will will analyze the survivability of terrestrial vertebrates compared to that of terrestrial invertebrates during the Permian-Triassic Extinction Event.... [tags: biodiversity, marine life, terrestrial life]
1520 words (4.3 pages)
- The Permian-Triassic Extinction is a mass extinction that occurred between the Permian and Triassic geologic time periods approximately 250 million years ago; it is the deadliest of all extinctions that have occurred on Earth. In addition, during the Permian-Triassic extinction the continents of today existed as one supercontinent known as Pangaea. This was the first time in history where continental or land mass exceeded that of the ocean. This was also before dinosaurs of the Triassic period roamed Earth, during this time animals such as the therapsids, and Synapsids such as the Pelycosaurs, insects and amphibians also occupied Earth.... [tags: Pangaea, Perish, CO2]
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- Demise of the Permian- Triassic Period It is well known that there was a mass extinction killing the dinosaurs. However 185 million years before their demise, almost all life on earth was destroyed.1 There has long been theories that meteorites are the cause the of the mass extinctions and professor Asish Basu believes he may have found clues that point to space as the cause of the extinction in the Permian- Triassic period.2 The Triassic period is during a time when the earth was divided in a giant land mass: pangea, and water.... [tags: Exploratory Essays Research Papers]
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- Throughout Earth’s history there have been many changes. These changes have consisted of temperature fluctuations, atmospheric differentiations, extinctions of various plant and animal life, etc. Over time everything seems to have evolved in some way form or fashion. However, the Permian Era extinction was different from all the rest. This extinction affected every form of life, but especially the marine life. Researchers have stated that 93-97% of all Earths species went extinct during this period of time.... [tags: Paleozoic Era, global warming, species, Earth]
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- The Permo-Triassic mass-extinction was a key event in the history of the earth. (Paleobiology and Biodiversity Research Group). This has also been informally known as the Great Dying. The Permian-Triassic extinction occurred 251.4 million years ago, forming the boundary between the Permian and Triassic geologic periods. This event was also the last periods of the Paleozoic Era. After so many years scientist still have not found the true cause behind such a horrible event. Some scientist have suggested many possible causes for the extinction such as: severe volcanism, a nearby supernova, environmental changes caused by the formation of a super continent, the devastating impact of a large ast... [tags: Animals, Plants, Life]
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- IntroductionThink of a world which existed 290 million years ago. As you look out over the terane in front of you, you think that you are on an alien planet. You see volcanoes spewing ash and lava. Beside them is the ocean which is swarming with many different species of echinoderms, bryozoans and brachiopods. As you look down onto the sea floor you are amazed at the countless number of starfish and urchins. Some animals leave you can't even describe and you have no idea even what phylum they belong to.... [tags: essays research papers fc]
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- The prominent theory is that dinosaurs died in a fiery death due to an asteroid crash on Earth, but is that really what caused their mass extinction. Every scientist has a theory, and with so many out there it was hard to just pick one, they all made sense. It is completely possible for a volcano to have killed the dinosaurs, or even an asteroid. Another popular theory was the ice age. These were all plausible reasons for the extinction of dinosaurs, and that’s when the combination theory was discovered.... [tags: Dinosaur, Cretaceous–Tertiary extinction event]
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