Q.
The graph formed by plotting species richness against area for a wide variety of taxa (angiosperm plants, birds, bats, fresh water fishes, etc.) turns out to be a
Alexander von Humboldt proposed the concept of species area relationship and observed that within a region species richness increases with increasing explored area but inly upto a certain limit, and the relation between species richness and area for a variety of taxa turns out to be a rectangular hyperbola.