An ecological survey along an altitudinal gradient in the Western Ghats reveals that while species richness within individual forest plots remains relatively stable, the species composition changes dramatically from the foothills to the upper montane shola-grassland ecosystems. Which of the following biodiversity concepts best accounts for this observed pattern of high species turnover between distinct habitats?
- High beta diversity reflecting steep species turnover across environmental gradientsAnswer
- BHigh alpha diversity resulting from uniform species distribution across all elevation zones
- CHigh gamma diversity caused by low habitat heterogeneity across the mountain range
- DNeoendemism driven by recent species introduction from lowland agricultural systems
Answer
High beta diversity reflecting steep species turnover across environmental gradients
Beta diversity explicitly measures the degree of species differentiation or turnover between distinct ecological communities along environmental gradients, such as elevation changes in mountainous hotspots like the Western Ghats.
Step-by-Step Solution
Key Concept
Whittaker's Biodiversity Metrics (Alpha, Beta, Gamma Diversity) and Endemic Distribution