Causes of biodiversity Losses
The world is facing an accelerated rate of extinction of species highly As a consequence of human activities. The four major factors that cause of loss of biodiversity are referred to as The Evil Quartet”.these four major factors are mentioned below:
- Habitat Loss and Fragmentation: As a result of pollution, urbanization, and other human activities, habitat loss and fragmentation are the leading causes of both animal and plant extinction and an important loss in species biodiversity. For instance, the Amazon rainforest (the planet’s lungs), which is the house of millions of species, is being cut down and removed for a variety of purposes. Tropical rainforest once constituted 14% of the landmass, but currently is not more than 6% As a result of the fragmentation of large habitats into small land spaces because of various human activities, mammals and birds that require extensive territories and migratory animals are badly affected.
- Over-Exploitation: Over-exploitation of natural resources leads to the extinction of several species. Humans overuse biological systems to obtain natural resources, which causes resource degradation and extinction. For Instance- Steller’s sea cow, the passenger pigeon, and many marine fishes are overharvested.
- Alien species invasions: When alien species are introduced deliberately or unintentionally, some of them become invasive, and cause the extinction of indigenous species. For Instance. As an illustration, the introduction of the Nile perch led to the extinction of cichlid fish in Lake Victoria. More than 200 species of cichlid fish in Lake Victoria in East Africa became extinct after the Nile perch was introduced to the body of water. Indigenous catfish in rivers are threatened by the unauthorized import of African catfish.
- Co-extinctions: When one species becomes extinct, the species that are connected with a species also becomes extinct. For Instance- the parasite also vanishes when its host fish does.
Biodiversity and Conservation Notes Class 12 Chapter 13
CBSE Class 12 Science Notes Chapter 13 Biodiversity and Conservation are an important part of Class 12 Science Notes for quick revision. They will benefit from having challenging study material to use in preparing for the exam. Students can get CBSE Class 12th Science Notes Chapter 13 Biodiversity and Conservation, Biodiversity, Types of Biodiversity, Importance of Biodiversity, How Many Species on Earth and How Many Species in India, Causes and Reasons for Biodiversity under this chapter We protect biodiversity. This CBSE Class 10 Science Chapter Questions and Answers for Biodiversity and Conservation is helpful to remember well.