Biodiversity: Types and Patterns of Life

Q: Explain biodiversity with respect to its types at all biological levels. Discuss different patterns of biodiversity.

Biodiversity (Biological Diversity) is the variety and variability of life on Earth. It is not uniformly distributed and varies significantly across biological levels and geographical regions. For OPSC aspirants, understanding these levels is key to analyzing Ecosystem Resilience.

1. Types of Biodiversity (Biological Levels)

  • Genetic Diversity: Refers to the variety of genes within a single species. This helps populations adapt to environmental changes. Example: India has over 50,000 genetically different strains of rice and 1,000 varieties of mango.
  • Species Diversity: Refers to the variety and richness of species in a region. Example: The Western Ghats have greater amphibian species diversity than the Eastern Ghats.
  • Ecological/Ecosystem Diversity: Refers to the variety of habitats and ecological processes (niches, food webs). Example: India’s diverse ecosystems include mangroves, rainforests, deserts, and coral reefs.

2. Patterns of Biodiversity

Biodiversity follows certain spatial patterns globally:

  • Latitudinal Gradients: Species diversity generally decreases as we move from the Equator to the Poles. The Tropics (23.5°N to 23.5°S) harbor more species because of a stable climate and higher solar energy.
  • Species-Area Relationship: Proposed by Alexander von Humboldt, it states that species richness increases with the explored area, but only up to a certain limit. Mathematically: $log S = log C + Z log A$.
  • Altitudinal Gradient: Similar to latitude, biodiversity usually decreases with increasing altitude due to harsher climatic conditions.

Definition of Key Term

Speciation: The evolutionary process by which populations evolve to become distinct species. In the tropics, undisturbed environments over millions of years have allowed for greater speciation compared to temperate regions.

Conclusion

In conclusion, biodiversity is the biological wealth of our planet. Protecting it at all levels is vital for Ecological Security. For India, being one of the 17 Megadiverse countries, conserving these patterns through In-situ (National Parks) and Ex-situ (Seed Banks) methods is a constitutional and ethical priority.

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