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How do biodiversity hot spots qualify for protection based on endemic vascular plants and habitat loss?

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World map using color coding to show the distribution of major floral kingdoms, subkingdoms, and regions. Key floral kingdoms include Boreal (green), Neotropical (pink), Paleotropical (yellow), South African or Capensic (purple), Australian (orange), and Antarctic (blue). Boundaries for subkingdoms, regions, and divisions are marked with different colored lines, and major regions such as Indoafrican, North American, and Malesian are labeled across continents. — biogeographic region Floral kingdoms, subkingdoms, and major regions of the world.

To qualify as a biodiversity hot spot, a region must meet two strict criteria established by conservationist Norman Myers:

Endemic Vascular Plants: The region must host at least 1,500 species of endemic vascular plants. These are plant species found exclusively within that specific area, which highlights the region's unique biological value and irreplaceability.1
Habitat Loss: The region must have lost 70 percent or more of its primary vegetation due to human activities.1

These criteria are used to identify areas where biodiversity is exceptionally high but also under immediate threat. By focusing conservation efforts on these specific sites, officials can work more systematically to prevent large-scale extinctions.1

The urgency of this protection is supported by the species-to-area relationship, which demonstrates that as habitat loss reduces an area's size, the number of species it can support declines significantly. Because hot spots have already experienced such extensive destruction, they are considered critical priorities for global conservation initiatives.12