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प्रश्न
The following graph shows the species - area relationship. Answer the following questions as directed.
(a) Name the naturalist who studied the kind of relationship shown in the graph. Write the observations made by him.
(b) Write the situations as discovered by the ecologists when the value of 'Z'
(Slope of the line) lies between.
(i) 0.1 and 0.2
(ii) 0.6 and 1.2
What does 'Z' stand for?
(c) When would the slope of the line 'b' become steeper?
उत्तर
(a) The German naturalist and geographer Alexander von Humboldt studied the species–area relationship. He found that species richness within a region increased with increasing area but up to a certain limit. The relationship between species richness and area turned out to be rectangular hyperbola for a wide variety of taxa.
(b)
(i) If the value of Z lies in the range of 0.1−0.2, then it is regardless of taxonomic group or region.
(ii) If the value of Z lies in the range of 0.6−1.2, then the slope of the line will be much steeper.
Z stands for the slope of the line or regression coefficient.
(c) If the species–area relationship is for very large areas such as the entire continent, then the slope of the line will be much steeper.
संबंधित प्रश्न
Explain, giving three reasons, why tropics show greatest levels of species diversity.
The 'rivet' in the rivet popper hypothesis is considered to represent the ______.
Extent of global diversity of invertebrates is shown in the pie diagram below. Choose the most appropriate alternative that the four portions (a-d) represent.
Select the correct alternative for x and y.
Which of these is true about tropical environments?
Which of these is true about tropical environments?
A species-area curve is drawn by plotting the number of species against the area. How is it that when a very large area is considered the slope is steeper than that for smaller areas?
Write the inference drawn by Alexander von Humboldt after his extensive explorations of South American jungle.
Which of the following hypothesis suggests that ecosystems are like aeroplanes where flight safety (ecosystem functioning) may or may not be compromised, depending upon which species are being lost?
Alexander von Humboldt observed that, within a region species richness ______ with increasing explored area.
