Industrial Melanism

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What is Industrial Melanism?

Industrial melanism is due to man-made influences leading to colour changes in various species. With the advent of the industrial revolution, many areas in North America and Europe started getting black due to covering them with carbon. The species that relied on camouflage to avoid predators either adapted to the changing circumstances or got extinct. The process of industrial melanism refers to micro-evolution due to the changes in the species.

Also read: Human Evolution

Industrial Melanism in Peppered Moth

The peppered moth Biston betularia F.typica is a light-coloured species with dark patches, that help them to camouflage against the lichens on the barks of the trees. F.carbonaria which is a sub-species of F.typica had undergone some mutation and changed to a dark-coloured moth having light-coloured patches. In the polluted areas, the light-coloured species could not protect themselves from predators. This was because the lichen population had reduced due to pollution and the light-coloured species were easily visible on the tree barks. This replaced the F.typica species with the F.carbonaria species.

Since Europe has started using environment-friendly modern technologies, the selection pressure from predation has reversed and the moth is returning to its typical variety. This process is slower than the initial change because the allele is recessive for light colour and copies from both the parents are required. This is called reverse industrial melanism. In Australia, one species of snakes living in water, with black and white stripes has become completely black due to urban pollution.

Industrial Melanism in Marine Dwellers

Industrial melanism had been observed in the turtle-headed sea snake. These snakes have black and white bands on their bodies, but researchers have come across snakes living in polluted water that are completely black. This is another evidence of animals evolving with respect to change in the surrounding environment.

Also read: What is Mutation

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Frequently Asked Questions

What is Industrial Melanism?

It is the appearance of dark melanic forms of some organisms like moths in the industrial region where the heavy emission of carbon from the burning coal has coloured the background.

Which phenomenon does Industrial Melanism exhibit?

Industrial melanism exhibits Natural Selection.

In which two organisms is industrial melanism observed?

Industrial melanism is observed in Biston betularia (peppered moth) and turtle-headed snakes.

What is Natural Selection?

Natural selection is a fundamental process of evolution in which any characteristic of an individual that allows it to survive and reproduce with the changing environmental conditions will be selected by nature and will gradually appear in all the individuals of that species.

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