Who observed that within a region species richness increase with increasing explored area?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) -Alexander von Humboldt
Species-Area relationships : During his pioneering and extensive explorations in the wilderness of South American jungles, the great German naturalist and geographer Alexander von Humboldt observed that within a region species richness increased with increasing explored area, but only up to a limit.
In fact, the relation between species richness and area for a wide variety of taxa (angiosperm plants, birds, bats, freshwater fishes) turns out to be a rectangular hyperbola. On a logarithmic scale, the relationship is a straight line described by the equation
log S = log C + Z log A
where S= Species richness
A= Area
Z = slope of the line (regression coefficient)