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Difficulty: MediumBiodiversity Concepts, Hotspots and Endemism

Which of the following statements regarding biodiversity metrics, species endemism, and global hotspots are correct?

  1. A
    Alpha diversity measures the rate of species turnover between distinct ecological communities along an environmental gradient.
  2. The Western Ghats hotspot exhibits a remarkably high proportion of endemic amphibian species compared to its total amphibian fauna.Answer
  3. Palaeo-endemic species represent ancient evolutionary lineages whose geographic ranges have contracted to isolated refugia over geological time.Answer
  4. D
    The designation of a region as a global biodiversity hotspot is based exclusively on total species count without considering habitat loss.

Answer

The correct statements are that the Western Ghats hotspot exhibits a high proportion of endemic amphibians, and palaeo-endemic species represent ancient evolutionary lineages restricted to isolated refugia.
The Western Ghats contains exceptional endemic fauna, particularly among amphibians where over three-quarters of species are found nowhere else. Additionally, palaeo-endemic species are relict lineages from ancient evolutionary times that survive in restricted refugia. Thus, both of these statements are scientifically accurate.

Step-by-Step Solution

1
Evaluate the definition of species turnover across communities.
The rate of species replacement along an ecological gradient is beta diversity, whereas alpha diversity measures local richness within a single community.
Differentiating spatial biodiversity indices.
2
Analyze Western Ghats fauna endemic proportions.
The Western Ghats has over 75% endemic amphibians and high endemic reptile density.
Verifying regional endemic patterns in Indian hotspots.
3
Examine the concept of palaeo-endemism.
Palaeo-endemics are ancient relictual species restricted to refugia, distinct from newly evolved neo-endemics.
Categorizing evolutionary types of species endemism.
4
Check quantitative hotspot qualification criteria.
Hotspots require both species endemism (>1,500 endemic vascular plant species) and degree of threat (at least 70% original habitat lost).
Assessing Norman Myers' criteria for global biodiversity hotspots.

Key Concept

Alpha versus Beta diversity, palaeo-endemism versus neo-endemism, and Norman Myers criteria for biodiversity hotspots.
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Topics

Biodiversity Concepts, Hotspots and Endemism

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