The large areas which contain exceptional concentrations of plant endemism and are experiencing very high rates of habitat loss are called ecological hot spots. The concept was first introduced by Mayer. These are also known as biodiversity hotspots. 2.3% of the Earth's land surface is represented by them. Currently, 36 biodiversity hot spots exist in the world. An area must meet two strict criteria for becoming an ecological hotspot. Contain at least 1,500 species of vascular plants found nowhere else on Earth (known as "endemic" species), Have lost at least 70 percent of its primary native vegetation.
So, the correct answer is 'Mayer'.
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