Alexander von Humbolt described for the first time
(a) ecological biodiversity
(b) law of limiting factor
(c) species area relationships
(d) population growth equation
(c) Alexander von Humbolt was a great German nautralist and geographer. He did extensive exploration in the wildness of South American forests. He established species area relationship. He observed that with in a region, species richness increase with increasing explored area, but upto a certain limit. Infact, the relationship between species richness and area for a variety of taxa turns out to be a rectangular hyperbola as shown in the figure below
Note that on log scale the relationship becomes linear.
On a logarithmic scale, the relationship is a straight line described by the equation.
log S = log C + Z log A
S = species richness
A = Area
Z = Slope of the line (regression coefficient)
C = Y-intercept