When The Earth Lost its Biodiversity!!

It came into my mind that all of us has encountered some major events in our lives. Similarly, our Earth would have also gone through the events of same kind. Mass-extinction is one of those events. Have a Read!

Mass-extinction is also known as biotic crisis or extinction-level event. It is characterized by major loss of biodiversity. When the extinction rate of organisms outweighs the speciation rate of organisms, mass- extinction occurs. Till now, Earth has witnessed a total of five mass-extinction.

Reasons Behind Mass Extinction

1. Global cooling i.e. the time period of the ice age characterised by colder temperatures and glaciation.

2. Global warming i.e. rise in average temperature because of enormous emission of greenhouse gases.

3. Glaciation i.e. formation of glaciers or freezing of water bodies this, leading to destruction of aquatic life.

4. Fluctuations in Sea Level– In case of global warming the sea level rises while that in case of global cooling the sea level lowers down thus, adversely affecting the aquatic habitats.

5. Global Anoxia i.e. decrease in oxygen concentration in atmosphere may have caused extinction as organisms could not survive in absence of oxygen.

6. Volcanic Eruptions i.e. release of lava and a large amount of gases from a volcanic vent.

7. Entry of asteroid, comets, and Meteors on Earth.

8. Gamma Rays released from supernova event may be a reason for mass extinction as these rays can penetrate through cells and destroy them.

9. Disease– Genome to genome transmission of pathogenic diseases would have lead to extinction of a specific species. About 12% of species extinction has been caused by diseases.

The Five Mass Extinctions

1. Ordovician-Silurian Extinction
2. Late Devonian Extinction
3. Permian-Triassic Extinction
4. Triassic-Jurassic Extinction
5. Cretaceous Extinction

#Mass Extinction Time PeriodPercentage loss of Biodiversity Major Reason
1Ordovician-Silurian444 mya85%Global Cooling
2Late Devonian383-359 mya75%Volcanic Eruption
3Permian-Triassic252 mya96%Volcanic Eruption
4Triassic-Jurassic201 mya80%Global Warming
5Cretaceous-Paleogene66 mya76%Asteroid Impact
A Brief of the Mass Extinctions (mya-million years ago )

This was all about the five mass extinctions. But, let me remind you that, we are moving towards the sixth mass extinction and the reason would be us, the Homo sapiens.

There is a immediate need of environmental conservation to avoid such events in future.

Earlier the mass extinctions were due to the natural changes but, for the sixth mass extinction, our fatal activities such as deforestation, environmental pollution, burning of fossil fuels and many more are enough to welcome another one in 240 to 540 years.

Hope you liked the post.

Have a Great Day Ahead.

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Read more on Mass Extinction

6 thoughts on “When The Earth Lost its Biodiversity!!

  1. Nice summary, Aditi.

    I think you might want to mention that global warming (and cooling) occurs because reasons other that GHG gases as well.

    Solar cycles, Milankovitch cycles, position of the continents (due to tectonic plate movement) and ocean currents also play a huge role in determining how energy behaves within Earth, and thus controlling the heat.

    Liked by 1 person

  2. Hi Aditi,
    This is a very informative article. I believe we should all work toward conserving and preserving nature and the bio-diversity around us. Recently we were working on a doctoral project which was on using Myth, Mythology and Legends based on ecology to create awareness regarding this phenomenon. We were mainly working with indigenous writers from the NE India. They are very insightful and offer very practical solutions. And yes, the next to be annihilated is the Homo Sapiens. Have you read Dan Brown’s ‘Origin’. The book mentions how AI is going to wipe out humans. Right now I am reading Yuval Noah Harari’s ‘Sapiens’ which talks about basically what you have written about in your blog. Do read it, if you can. And keep writing such articles.
    Best wishes,

    Liked by 1 person

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