Unit 3: Biodiversity of India

Value of Indian Biodiversity

India's biodiversity holds immense value, which can be categorized as:

• Direct Value: Products harvested directly from nature.
  • Food: Crops, fruits, vegetables, fish.
  • Fuel: Firewood.
  • Medicine: Many traditional and modern medicines originate from plants.
• Indirect Value (Ecosystem Services): Benefits from healthy ecosystems.
  • Pollination of crops.
  • Climate regulation and carbon storage by forests.
  • Flood control by wetlands and mangroves.
  • Soil formation and nutrient cycling.
• Ethical/Aesthetic Value: The cultural, spiritual, and recreational value of nature.

Threats to Indian Biodiversity

India's rich biodiversity is under severe threat. The main causes are the same as the "Evil Quartet" (Unit 2) but in the specific Indian context:

• Habitat Loss and Fragmentation: The primary threat. Forests, grasslands, and wetlands are being converted for agriculture, urbanization, and industrial projects.
• Overexploitation: Overharvesting of medicinal plants, illegal wildlife trade (poaching) for tigers, rhinos, and elephants, and overfishing.
• Pollution: Industrial, agricultural (pesticides), and domestic pollution degrade water bodies and soil.
• Invasive Species: Non-native species like Parthenium (Congress grass) and Lantana camara outcompete native flora.

Hotspots of Indian Biodiversity

Definition: A Biodiversity Hotspot is a biogeographic region that is both a significant reservoir of biodiversity and is under high threat from humans. To qualify, a region must contain at least 1,500 species of endemic vascular plants (high endemism) and have lost at least 70% of its original vegetation (high threat).

India is home to four major global biodiversity hotspots:

[Image of Biodiversity Hotspots in India map]

1. The Himalayas: Includes the entire Himalayan range.
2. The Western Ghats: A mountain range along the western coast of India.
3. Indo-Burma Region: Includes North-Eastern India (Assam, etc.), Myanmar, Thailand, etc.
4. Sundaland: Includes the Nicobar Islands.

Germplasm and Diversity

• Germplasm: Refers to the living genetic resources of a species, such as seeds, pollen, spores, or tissue cultures. It is the "raw material" for plant breeding and biotechnology.
• Germplasm Diversity: This is the total variety of genes and alleles available in the germplasm of a crop and its wild relatives. Conserving this diversity (e.g., in seed banks) is crucial for future food security, as it holds genes for traits like drought resistance or disease immunity.

Conservation Strategies (In-situ and Ex-situ)

There are two primary approaches to biodiversity conservation:

In-situ (On-site) Conservation

This means conserving species in their natural habitats. It is the most preferred method as it protects the entire ecosystem and allows evolutionary processes to continue.

• National Parks: Areas strictly reserved for wildlife, where activities like grazing, forestry, and cultivation are not permitted.
• Wildlife Sanctuaries: Areas where protection is given to fauna (animals). Some human activities (like regulated grazing) may be allowed.
• Biosphere Reserves: Large, multi-purpose protected areas that aim to balance conservation with sustainable human use. (See Unit 4 for more detail).

Ex-situ (Off-site) Conservation

This means conserving species outside their natural habitats. It is used when a species is critically endangered and its natural habitat is lost or unsafe.

• Botanical Gardens: Cultivate and display a wide range of plants, including rare species.
• Zoological Parks (Zoos): Maintain populations of animals, often with captive breeding programs for endangered species.
• Gene Banks / Seed Banks: Seeds (germplasm) are stored at very low temperatures (-20°C) to keep them viable for long periods.
• Cryopreservation: "Freeze preservation" of pollen, embryos, or tissue in liquid nitrogen (-196°C) for very long-term storage.

Sustainability, Bioethics, and Tribal Population

• Sustainable Development: Development that "meets the needs of the present without compromising the ability of future generations to meet their own needs." In conservation, this means using biological resources (e.g., fishing, logging) at a rate that allows them to replenish, ensuring "sustainable development rights".
• Bioethics and Tribal Population: Tribal and indigenous communities often live in close contact with biodiversity and possess vast "Traditional Knowledge" (TK) about the use of plants and animals. Bioethics dictates that this knowledge must be respected, and these communities should share in any benefits that arise from its commercial use (see Biopiracy, Unit 4).

India as a Mega-biodiversity Nation

India is one of the 17 "megadiverse" countries in the world. This is because:

1. Varied Topography: It has high mountains (Himalayas), vast plains (Ganges), deserts, long coastlines, and islands.
2. Varied Climate: It has diverse climatic zones, from alpine tundra to tropical rainforests.
3. Biogeographic Crossroads: It is at the junction of three biogeographic realms (Afrotropical, Indo-Malayan, and Palearctic), so flora and fauna from all three are found here.
4. High Endemism: Its location as a subcontinent and its hotspots (like the Western Ghats) have led to the evolution of many endemic species.