The above graph shows species- area relationship. Write the equation of the curve 'a' and explain.
The relation between species richness and area for a wide variety of taxa (angiosperm plants, birds, bats, fresh, water fishes) turns out to be a rectangular hyperbola S = .
log S = log C + Z log A
Ecologists found that the value of Z lies in the range of 0.1 to 0.2, regardless of taxonomic group of the region.
The species area relationship among very large areas like entire continents, will give a steeper slop (Z values in the range of 0.6 to 1.2)
Example : In frugivorous birds and mammals in the tropical forests of different continents, the slope is found to be 1.15.