UPSC DAW Mains Answer Writing 2025 18th August

UPSC DAW Mains Answer Writing 2025 18th August

Question

‘Biodiversity within ecological regions often follows discernible patterns rather than random distribution.’ Explain how such patterns enhance our understanding of species diversity, and analyse their significance for conservation strategies in the face of environmental change. (10 marks, 150 words) 

Model Answer

Introduction:  

  • Biodiversity is structured by ecological and evolutionary forces rather than being randomly scattered. Recent research in Nature Ecology & Evolution highlights an ‘onion-like’ layering of species diversity, with endemic-rich cores grading outward into mixed margins. Recognising such patterns deepens ecological understanding and informs conservation planning. 

 Understanding Species Diversity through Patterns: 

  • Ecological Filters: Abiotic factors such as rainfall, temperature, and altitude act as environmental sieves determining species’ survival. 

  • E.g. The global study found in 98% cases that temperature–rainfall models predicted biodiversity layering. 

  • Endemism and Hotspots: Core zones harbour narrowly distributed, endemic species—unique to that ecosystem. 

  • E.g.  Western Ghats (UNESCO World Heritage) with >50% amphibians endemic; Himalayas as identified by Critical Ecosystem Partnership Fund. 

  • Nested Subsets, Not Replacements: Outer layers usually contain subsets of core species rather than completely different ones, revealing evolutionary continuity. 

  • E.g. Amazon rainforest periphery shows overlap with Andean slopes species, documented in IUCN Red List assessments. 

  • Species Interactions & Corridors: Transitional layers reveal dispersal routes and ecological linkages across regions. 

  • E.g. Elephant corridors in Nilgiris and Terai Arc Landscape (WWF India) highlight such patterns. 

  • Predictable Global Rules: Patterns align with established laws like the Latitudinal Diversity Gradient and Rapoport’s Rule. 

  • E.g. IPBES Global Assessment (2019) notes tropical concentration of biodiversity and reduced richness towards poles. 

 Significance for Conservation Strategies: 

  • Targeted Protection of Core Zones: Core regions rich in endemics yield maximum conservation payoff; protecting them preserves irreplaceable biodiversity. 

  • E.g. National Biodiversity Action Plan (2008) prioritises hotspots (E.g., Western Ghats, Himalaya, Indo-Burma, Sundalands in Nicobar). Buxa Tiger Reserve in Himalayan foothills protects high endemic bird species. 

  • Climate Change Adaptation and Buffering: Transition zones act as buffer areas, allowing species migration under changing climate. 

  • E.g. IPCC AR6 (2022) highlights Himalayas’ vulnerability; altitudinal corridors critical for species shifting upward due to warming. Snow leopard habitats in Indian Himalaya already shrinking; adaptation corridors essential. 

  • Corridor and Landscape-level Planning: Identifying outer mixed layers helps plan ecological corridors to maintain genetic flow and prevent fragmentation. 

  • E.g. Wildlife corridors in Ken-Betwa Interlinking project EIA debate (2022); Elephant corridors in Odisha (NTCA & WII mapping) integrated into CAMPA funds utilisation. 

  • Strengthening Environmental Impact Assessment (EIA): Layered biodiversity data helps refine impact predictions and mitigation in project appraisals. 

  • E.g. SC in Lafarge Umiam Mining case (2011) mandated biodiversity considerations in clearance; EIA Notification 2006 (MoEFCC) can integrate biodiversity layering into cumulative impact assessment. 

  • Global and National Policy Alignment: Pattern-based biodiversity mapping aligns with India’s and global commitments. 

  • Kunming-Montreal Global Biodiversity Framework (CBD COP15, 2022): 30×30 protection goal (protect 30% land & water by 2030). 

  • Ecosystem Services and Local Livelihoods: Protecting core zones ensures ecosystem services, water regulation, pollination, carbon sequestration, critical for communities. 

 Conclusion:  

  • Recognising biodiversity’s layered, non-random patterns enhances ecological science by showing how climate, geography, and evolution structure life. For conservation, this translates into prioritising endemic cores, designing buffer corridors, strengthening EIAs, and aligning with climate adaptation strategies. It also supports India’s obligations under SDGs, and National Biodiversity Action Plan, ensuring both ecological resilience and socio-economic sustainability.