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प्रश्न
Give three hypotheses for explaining why tropics show greatest levels of species richness.
उत्तर
Such hypotheses are as follows:
- Speciation is generally a function of time. Temperate regions have been subjected to repeated glaciation since ancient times, while tropical latitudes have been undisturbed for millions of years. Hence, there has been a longer time for species evolution and diversification.
- The tropical environment is different from the temperate environment and shows fewer seasonal changes. This stable environment has encouraged niche specialisation, which has led to greater species diversity.
- More solar energy is available in tropical regions, which leads to greater productivity, indirectly leading 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.
(i) 0.1 and 0.2
(ii) 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.
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.
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 ____________.
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?
Select the correct alternative for x and y.
Amongst the animal groups given below, which one appears to be more vulnerable to extinction?
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?
Given below is an equation describing the Species-Area relationship between species richness and area for a wide variety of taxa as angiosperm plants, birds, bats etc. S = CAz
- Give a graphical representation of the given equation showing Species-Area relationship.
- What does 'S' represent in the given equation?
- What is the value of 'Z' (regression coefficient) for frugivorous birds and mammals in the tropical forests of different continents?
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 ______.
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?
Who observed that within a region, species richness increased with increasing explored area, to a certain limit?
