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प्रश्न
Give three hypotheses for explaining why tropics show greatest levels of species richness.
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उत्तर
- Speciation is generally a function of time. Temperate regions have been repeatedly glaciated since ancient times, while tropical latitudes have remained undisturbed for millions of years. Hence, there has been more time for species to evolve and diversify.
- The tropical environment is different from the temperate environment and shows fewer seasonal changes. This stable environment has encouraged niche specialisation, leading to greater species diversity.
- More solar energy is available in tropical regions, which leads to greater productivity and, indirectly, to more extraordinary biodiversity.
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संबंधित प्रश्न
Explain, giving three reasons, why tropics show greatest levels of species diversity.
What is the significance of the slope of regression in a species-area relationship?
Observe the graph and select the correct option:
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.
Which of the following hypothesis states: Rich species diversity leads to lesser variation in biomass production over a period of time.
Latitudinal and altitudinal gradient is shown by which of the following habitat(s)?
Maximum species richness is observed in the ______.
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 ____________.
Species richness - area relationship is given by ______.
The pattern of biodiversity is affected by ______.
Which of the following countries has the highest biodiversity?
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?
There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
The relation between species richness and area for a wide variety of taxa turns out to be a rectangular hyperbola. Give a brief explanation.
Write the inference drawn by Alexander von Humboldt after his extensive explorations of South American jungle.
Lesser variation in biomass production over a period of time is called ______.
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 ______.
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 |
The latitudinal gradient describes a pattern where species richness is highest in which geographic region?
The altitudinal gradient describes a pattern where species diversity is greatest at which elevation?
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?
For smaller areas, what is the typical range of the Z value (slope) in the species-area relationship?
