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Question

Who observed that within a region, species richness increased with increasing explored area but only upto a limit?

A
Paul Ehrlich
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B
David Tilman
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C
Alexander von Humboldt
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D
Edward Wilson
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E
Robert Mayr
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Solution

The correct option is C Alexander von Humboldt
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 regional species richness increased with the increasing explored area, but only up to a limit. In fact, the relationship 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) C = Y-intercept.
So, the correct answer is 'Alexander von Humboldt'.

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