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Difficulty: MediumBiodiversity Concepts, Hotspots and Endemism

Norman Myers introduced the concept of biodiversity hotspots to identify geographic regions experiencing critical habitat degradation alongside exceptionally high endemic species concentration. According to the established quantitative criteria, what is the minimum threshold of endemic vascular plant species a region must possess to be designated as a global biodiversity hotspot?

  1. At least 1,500 endemic species of vascular plants (or > 0.5% of the global total)Answer
  2. B
    At least 2,500 endemic species of vascular plants (or > 1.0% of the global total)
  3. C
    At least 500 endemic species of terrestrial vertebrates regardless of plant diversity
  4. D
    At least 5,000 total endemic species comprising both flora and fauna

Answer

At least 1,500 endemic species of vascular plants (or > 0.5% of the global total)
According to the criteria formalized by Norman Myers and adopted by Conservation International, a region must meet two quantitative conditions to be recognized as a biodiversity hotspot: (1) high endemism, specifically harboring at least 1,500 endemic vascular plant species (> 0.5% of global total), and (2) high degree of threat, having lost 70% or more of its primary original vegetation.

Step-by-Step Solution

1
Identify the quantitative criteria established by Norman Myers (1988/2000) for global biodiversity hotspots.
Two main criteria are identified: species endemism threshold and habitat loss threshold.
Hotspots prioritize conservation areas with extreme biological richness under severe threat.
2
Evaluate the baseline biological richness requirement.
A region must harbor at least 1,500 species of endemic vascular plants, representing more than 0.5% of the world's total plant species.
Vascular plants serve as the foundational indicator group for ecosystem diversity.
3
Evaluate the threat level requirement.
The region must have lost at least 70% of its original primary natural vegetation.
This confirms that the ecosystem is under high threat of destruction.

Key Concept

Hotspot Criteria and Endemism Thresholds
Estimated Time:1m 0s
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Topics

Biodiversity Concepts, Hotspots and Endemism

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