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प्रश्न
What is the significance of the slope of regression in a species-area relationship?
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उत्तर
The great German naturalist and geographer Alexander Von Humboldt established the relationship between species richness and area after extensive exploration in the forests of South America. According to him, to some extent the species richness of an area increases with the expansion of the exploration area. The relationship between species richness and the area of wide varieties of taxa is a rectangular hyperbola. It represents a straight line on a logarithmic scale. This relationship can be represented by the following equation –
log S = log C + Z log A
where,
S = species richness, A = area,
Z = slope of the line (regression coefficient)
C = Y-intercept
According to ecologists, the value of Z ranges from 0.1 to 0.2. It does not depend on the taxonomic group or region. Surprisingly, the slopes of the regression line are the same. If we analyse the species-area relations of a large group, such as an entire continent, then it is found that the slope of the regression line is steeply slanted. The range of the value of Z is 0.6 to 1.2.
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संबंधित 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:
- 0.1 and 0.2
- 0.6 and 1.2
What does ‘Z’ stand for?
(c) When would the slope of the line ‘b’ become steeper?
Give three hypotheses for explaining why tropics show greatest levels of species richness.
Latitudinal and altitudinal gradient is shown by which of the following habitat(s)?
In the equation: log S = log C + Z log A , S= species richness; Z = slope of line (regression coefficient); A = area; C = Y intercept. For smaller area, the value of Z ranges from ____________.
With reference to graph select the correct alternative
All are true regarding graph showing species richness - area relationship, EXCEPT ______.
Which of the following is an observation of Alexander von Humboldt's documented pattern in ecology?
The graph of species richness and area for a number of taxa like angiospermic plants, freshwater fishes, and birds is found to be ______.
Which of the below mentioned regions exhibit lees seasonal variations?
Which of these is true about tropical environments?
The pattern of biodiversity is affected by ______.
Which of the following countries has the highest biodiversity?
Which one of the following is not a major characteristic feature of biodiversity hot spots?
Amongst the animal groups given below, which one appears to be more vulnerable to extinction?
What does the term ‘Frugivorous’ mean?
Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?
There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?
The relation between species richness and area for a wide variety of taxa turns out to be a rectangular hyperbola. Give a brief explanation.
The species-area relationship is represented on a log scale as ______.
Distribution of diversity on earth shows that biodiversity from higher latitudes to lower latitudes ______.
For frugivorous (fruit-eating) birds and mammals in the tropical forests of different continents, the slope of the species-area relationship is found to be approximately ______.
The relation between species richness and area for a wide variety of taxa appears as ______.
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?
Rivet Popper Hypothesis is an analogy to explain the significance of ______.
Who observed that within a region, species richness increased with increasing explored area, to a certain limit?
When pre-reproductive and post - reproductive age group is same in structure, the population is______.
