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The Biggest Biodiversity Extinction |
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by Mehri Huseynli | 03-06-2019 05:09
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The biggest biodiversity extinction is Cretaceous - Paleogene event which devastated the global environment, mainly through a lingering impact winter which halted photosynthesis in plants and plankton. At the end of the Cretaceous era, the empire of dinosaurs was spread all over the world. But the impact of meteorite to the Yucatan Peninsula of Mexico brought the end of this empire 65 million years ago. Although it is generally accepted that the meteor impact caused extinction, other theories continue to be put forward in order to explain the extinction. The common volcanism at the end of the period and the climatic changes caused by the separation of the continents are just a few of these theories. Pterosaurs, Ichthyosaurs, Mosasaurs, Plesiosaurs were reptile groups that disappeared together with dinosaurs. Most primitive birds, half of the marine invertebrate groups including rudist mytilus, belemnit and ammonites, many foramifer species, include many marine plankton including microorganisms. About 35% of land plants have been destroyed. About 70% of all species disappeared. After the K–Pg extinction event, biodiversity required substantial time to recover, despite the existence of abundant vacant ecological niches. This extinction, known as the Cretaceous-Tertiary extinction, caused the Mesozoic period to be closed. In the new ecosystem, which was established after extinction, reptiles lost their importance and mammals became dominant. So, the Cenozoic period started. |
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5 Comments
Hello Mehri
I do hope that you are fine and doing great with your works.
Thank you for your report about Cretaceous - Paleogene event which was the biggest biodiversity extinction. I still remember my teacher explaining about it in my high school.
Green Cheers from Nepal :)
Keep writing great reports.
We are eager to read more reports from you.
Regards,
Kushal Naharki
Posted 17-06-2019 05:51
Hello Mehri!
Thank you for your report and I really enjoyed reading it. This is a gentle reminder that please submit your report on time. Biodiversity was May's topic. Thank you!
Louis Mentor
Posted 09-06-2019 20:21
Hello Mehri!
Thank you for letting us know about Cretaceous-Tertiary extinction. Though the mechanism behind the loss of species is quite different from today??s biodiversity loss, it is still a very interesting topic. The causes of mass extinction is still controversial but many scientific researches that provide good explanation of this mass extinction has been presented. Thanks for your amazing report and keep up the good work!
Wonhee Mentor
Posted 07-06-2019 19:01
Hey there Mehri!
I love this report! It takes me back to my third year university session, when we had a lecture on the 6th extinction (Cretaceous - Paleogene). And as you mentioned, there was a number of theories mentioned for the massive destruction of our species prior the Cenozoic period.
One other theory that I was taught and find to be realistically true is that of the dust collection that of 'Dust Accumulation in the Atmosphere'. When the meteorites hit Earth, not only did it wipe out species due to its impact, and initiated volcanic eruptions, but it put a plume of dust into the atmosphere, this suffocated the species, it brought about a 'cold' Earth because it blocked the Sun's rays and thus, plants could not photosynthesize.
This dust plume was the ultimate result on the death of our larger than life species. I like to look at it as the Ultimate 'Air Pollution Prior Civilisation'
Thank you so much for this report Merhi! I really liked your take on the subject matter and you brought forth a thought provoking discussion...
Well done!!!!!!!!
I cannot wait to read your next report!
Warm regards,
Rosa
Posted 03-06-2019 18:52
Hello mehri
Thank you so much for letting us know about era and animals at particular era.
Good report.
Green cheers!
Posted 03-06-2019 13:50