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(C) According to the species-area relationship proposed by Alexander von Humboldt,the relationship between species richness and area is a rectangular

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$1.15$

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(C) According to the species-area relationship proposed by Alexander von Humboldt,the relationship between species richness and area is a rectangular hyperbola. On a logarithmic scale,this relationship becomes a straight line described by the equation $\log S = \log C + Z \log A$. Here,$S$ is species richness,$A$ is area,$Z$ is the slope of the line (regression coefficient),and $C$ is the $Y$-intercept. For smaller areas,the value of $Z$ generally ranges from $0.1$ to $0.2$. However,for very large areas like the entire continent or for specific groups like frugivorous birds and mammals in tropical forests,the slope of the $Z$ line is much steeper,typically around $1.15$.

In the tropical forests of different continents,the slope of the $Z$ line for frugivorous birds and mammals is found to be $...........$.

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