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Question

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

  1. David Tilman
  2. Paul Ehrlich
  3. Alexander von Humboldt
  4. Edward Wilson
  5. Robert Mayr

A
Paul Ehrlich
B
Alexander von Humboldt
C
Edward Wilson
D
Robert Mayr
E
David Tilman
Solution
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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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Similar Questions
Q1
Who observed that within a region, species richness increased with increasing explored area but only upto a limit?

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Q2
Read the following statements (A - D) related to species - area relationship and select the correct option stating true (T) and false (F).
A. Explored area plot against species richness gives a rectangular hyperbola.
B. Log S = log C + Z log E.
C. Species richness increases with decreasing explored area.
D. Alexander von Humboldt proposed the species - area relationship.
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Q3
As the area increases, species richness
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Q4
Species richness is also function of the area of a region; the species area relationship is generally __________ function.
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Q5
Match the following:
A. α diversity1. The richness of different species in a habitat.
B. β diversity2. The richness of different species along with a gradient from one habitat to another habitat within the community.
C. γ diversity3. The richness of different species in different habitat.

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