Who observed that 'within a region, species richess icreased with increasing explored area but only upto a limit'

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

Which of the statement are in accordance with the observation of geographer Alexander von Humboldt ? I. Within a region species, richness increases with increasing explored area but within a limit. II. The relation between species richness and area is a rectangular hyperbole. III. The richness of species decreases with the increasing explored area. IV. There is no relation between the explored area and species richness .

Which of the statement are in accordance with the observation of geographer Alexander von Humboldt ? I. Within a region species, richness increases with increasing explored area but within a limit. II. The relation between species richness and area is a rectangular hyperbola. III. The richness of species decreases with the increasing explored area. IV. There is no relation between the explored area and species richness .

Alexander von Humboldt is associated with (a.) species - area relationship (b.) log S = log C + z logA (C.) Within a region , species richness increases with the increasing limited explored area. (d.) Increased diversity contributes to higher productivity. (e.) Species diversity increases with the loss of keystone species.

Alexander von Humboldt is associated with (a.) species - area relationship (b.) log S = log C + z logA (C.) Within a region , species richness increases with the increasing limited explored area. (d.) Increased diversity contributes to higher productivity. (e.) Species diversity increases with the loss of keystone species.

Who explored the species area relationship ?