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Who observed that within a region, species richness increases with the increased explored area but only up to a limit?
(a)Paul ehrlich
(b)David tilman
(c)Alexander von Humboldt
(d)Edward Wilson
(e)Robert mayr

Answer
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Hint: While working on the wilderness of South American Jungles, German naturalists and geographers have found that with growing exploration areas, species richness increased at specific locations.

Complete answer:
In fact, a rectangular hyperbola turns out to be the relationship between species richness and area for a wide range of taxa (angiosperm plants, birds, bats, freshwater fishes). The relationship is a straight line defined by the equation log S = log C + Z log A on a logarithmic scale where S = species wealth A = area Z = line slope (regression coefficient) C = Y-intercept. Increasing the sampled region improves the wealth of organisms found, both because more individuals are included in the study and because wide areas are more heterogeneous than small areas in the setting. Most organisms in the tropics have multiple organism classes, which contributes to latitudinal gradients in species richness.

Additional Information:
Importance of species richness-
Species richness is the name of the number of species per unit area. If you have more animals, the ecosystem would be healthy if you have more animals. More species abundance would also help to increase biodiversity, which is an important part of conserving biodiversity.
So, the correct answer is ‘Alexander von Humboldt’.

Note: In an ecological environment, ecosystem, or area, species richness is the number of different species represented. The richness of species is simply a count of species, and the abundances of the species or their relative distribution of abundance are not taken into account.