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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.
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.
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?
Species richness - area relationship is given by ______.
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?
Which of these is true about tropical environments?
The pattern of biodiversity is affected by ______.
Amongst the animal groups given below, which one appears to be more vulnerable to extinction?
There is greater biodiversity in tropical /subtropical regions than in temperate region. Explain.
Is it true that there is more solar energy available in the tropics? Explain briefly.
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.
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 ______.
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 ______.
Alexander von Humboldt observed that, within a region species richness ______ with increasing explored area.
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 |
