Impact of Mass Extinction in Evolution
Throughout the history of life, extinctions of species have occurred increasingly and continuously. Due to destruction of habitat or environment, a specie can become extinct, in which it lives. And there are few other factors due to which a specie may extinct
? Biological Factors
? Physical Factors
Like evolution in an animal body parts may cause risk of life for other species. And they may become vulnerable to prediction by that species’ organism.
Like increase in temperature in oceans may results in valuable species extinction.
Extinction is inevitable process. It is happening from the beginning of life. However, two most notorious mass extinction are
? Permian mass extinction (Almost 250 million years ago).
? Cretaceous mass extinction, which happened 65 million years ago.
Role of Mass Extinction:
Diversity reduced by mass extinctions by killing off specific lineages and descendent species they might have given rise to. Mass extinction can also play a creative role in stimulating the growth of other branches and in evolution. This creates new opportunities for existing and surviving species that the plants and animals are disappearing. These lineages may evolve specialization and can take over ecological roles or may evolve brand new ecological strategies, over these generations of natural selection. In this way, mass extinction can level the evolutionary playing field for a short time, which will allow lineages that were formerly minor player to diversify and become much more prevalent. Mass extinction, actually, reduced competition for resources and vacant niches leave behind, by removing, in a short period of time, so many species from their ecosystems.
There are five big mass extinctions that were seen in the having huge intensities that removed about greater than 50 percent of relatively abundant marine invertebrate. The best mass known mass extinction is the cretaceous tertiary (K-T) one. There is an evidence that when meteorites fall on earth then most probably the chances of extinction of species. Normally, extinction of species is a slower process as compared to the production. But due to the sudden change in the climate, temperature or some volcanic eruption occurs, some species extinct and the new species evolve rapidly.
Mass extinction is not caused by one factor. Actually, it is the result and combination of different factors like havocs, volcanic eruption, climate change, temperature etc. Mass extinction is very important in evolution. When species extinct then new species are formed.so, we can say that mass extinction is the integral part of evolution.