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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
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?
What is the significance of the slope of regression in a species-area relationship?
Short answer type question
Tropical regions exhibit species richness as compared to polar regions. Justify.
Which of the following hypothesis states: Rich species diversity leads to lesser variation in biomass production over a period of time.
On a log scale the relationship of species richness and area becomes linear (straight line) and is given by the equation.
With reference to graph select the correct alternative
All are true regarding graph showing species richness - area relationship, EXCEPT ______.
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 the below mentioned regions exhibit lees seasonal variations?
Which of these is true about tropical environments?
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?
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?
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?
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 ______.
The relation between species richness and area for a wide variety of taxa appears as ______.
Alexander von Humboldt observed that, within a region species richness ______ with increasing explored area.
Who observed that within a region, species richness increased with increasing explored area, to a certain limit?
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:
