To qualify as a biodiversity hotspot on Myers 2000 edition of the hotspot-map, a region must meet two strict criteria: it must contain at least 0.5% or 1,500 species of vascular plants as endemics, and it has to have lost at least 70% of its primary vegetation.
Also know, why are hot spots so important?
The melted rock, known as magma, often pushes through cracks in the crust to form volcanoes. Hot spot volcanism is unique because it does not occur at the boundaries of Earth's tectonic plates, where all other volcanism occurs. Instead it occurs at abnormally hot centers known as mantle plumes.
Why are ecological hotspots important?
Certain areas have large numbers of endemic species — those found nowhere else. Many of these are heavily threatened by habitat loss and other human activities. These areas are the biodiversity hotspots, 35 regions where success in conserving species can have an enormous impact in securing our global biodiversity.
How many hotspots are there in the world?
34 biodiversity hotspots have been identified. They once covered 15.7 percent of the Earth's land surface. 86 % of the hotspots' habitat has already been destroyed. The intact remnants of the hotspots now cover only 2.3 % of the Earth's land surface.