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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 slope of regression measures the rate at which species richness increases as the explored area expands. Its significance is explained below:
- For Small/Limited Areas: For a limited region like a country, the value of the slope remains constant and ranges from 0.1 to 0.2, regardless of the taxonomic group or the geographic region.
- For Large Areas: When measuring the species-area relationship over vast areas, such as entire continents, the regression slope becomes much steeper, typically ranging from 0.6 to 1.2. This indicates that larger areas support a much higher rate of species accumulation.
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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?
Explain, giving three reasons, why tropics show greatest levels of species diversity.
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.
Latitudinal and altitudinal gradient is shown by which of the following habitat(s)?
On a log scale the relationship of species richness and area becomes linear (straight line) and is given by the equation.
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 ______.
Select the correct alternative for x and y.
Which of these is true about tropical environments?
"Species richness increased with increased explored area but only a limit". This statement was given by.
Which of the following countries has the highest biodiversity?
Species diversity decreases as we move away from the equator towards the poles. What could be the possible reasons?
Study the graph given below:
As per Alexander von Humboldt, what do the symbols S, A, Z and C in the graph stand for, in respect of a species and area relationship?
Lesser variation in biomass production over a period of time is called ______.
Distribution of diversity on earth shows that biodiversity from higher latitudes to lower latitudes ______.
The relation between species richness and area for a wide variety of taxa appears as ______.
Rivet Popper Hypothesis is an analogy to explain the significance of ______.
When pre-reproductive and post - reproductive age group is same in structure, the population is______.
Tropical regions show greatest level of species richness because -
- Tropical latitudes have remained relatively undisturbed for millions of years, hence more time was available for species diversification.
- Tropical environments are more seasonal.
- More solar energy is available in tropics.
- Constant environments promote niche specialization.
- Tropical environments are constant and predictable.
Choose the correct answer form the options given below:
Match the scientist in column I with their contribution in column II and choose the correct option.
| Column I | Column II | ||
| i. | Alexander Van Humboldt | a. | Estimated 7 million species round the globe |
| ii. | Robert May | b. | Rivet popper hypothesis |
| iii. | David Tillman | c. | Species Area Relationship |
| iv. | Paul Ehrlich | d. | Productivity stability hypothesis |
In the species-area relationship formula log S = log C + Z log A, what does the variable A represent?
What does the variable Z represent in the species-area relationship formula log S = log C + Z log A?
What does the variable C represent in the species-area relationship formula log S = log C + Z log A?
For smaller areas, what is the typical range of the Z value (slope) in the species-area relationship?
For very large areas such as entire continents, what is the typical range of the Z value in the species-area relationship?
