13
Question
Statement 1: If the species-area relationships are analysed among very large areas like entire continents, the value of Z i.e., the slope of line lies in the range of 0.1 to 0.2
Statement 2: The value of Z i.e., the slope of the line of species - area relationship lies in the range of 0.6 to 1.2 when analysis is done among small areas.
Statement 1: If the species-area relationships are analysed among very large areas like entire continents, the value of Z i.e., the slope of line lies in the range of 0.1 to 0.2
Statement 2: The value of Z i.e., the slope of the line of species - area relationship lies in the range of 0.6 to 1.2 when analysis is done among small areas.
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Solution
The correct option is B Both the statements 1 and 2 are incorrect
Alexander von Humboldt was a German naturalist and geographer who proposed the species - area relationships of an ecosystem. He observed that within a region, species richness increases with increasing explored area, but up to a certain limit.
The relationship plot between species richness and area gives a rectangular hyperbola.
This graph can be represented by the equation,
S = CAZ
On logarithmic scale, it can be represented as
log S = log C + Z log A
where S - Species richness
Z - Slope of line (regression coefficient)
C - Y-intercept
A - Area
Value of slope (Z) indicates species richness of the considered area.
Ecologists have found out that the value of the Z ranges between 0.1 and 0.2 irrespective of the taxonomic group or the region. For example, the plants in Britain, birds in California, molluscs in New York state, etc.
However, in larger areas such as entire continents, the slope of the line is much steeper and the Z value ranges between 0.6 to 1.2
Hence, both the statements are incorrect.
Alexander von Humboldt was a German naturalist and geographer who proposed the species - area relationships of an ecosystem. He observed that within a region, species richness increases with increasing explored area, but up to a certain limit.
The relationship plot between species richness and area gives a rectangular hyperbola.
This graph can be represented by the equation,
S = CAZ
On logarithmic scale, it can be represented as
log S = log C + Z log A
where S - Species richness
Z - Slope of line (regression coefficient)
C - Y-intercept
A - Area
Value of slope (Z) indicates species richness of the considered area.
Ecologists have found out that the value of the Z ranges between 0.1 and 0.2 irrespective of the taxonomic group or the region. For example, the plants in Britain, birds in California, molluscs in New York state, etc.
However, in larger areas such as entire continents, the slope of the line is much steeper and the Z value ranges between 0.6 to 1.2
Hence, both the statements are incorrect.
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