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प्रश्न
Give three hypotheses for explaining why tropics show greatest levels of species richness.
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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
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 ____________.
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 these is true about tropical environments?
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 one of the following is not a major characteristic feature of biodiversity hot spots?
Amongst the animal groups given below, which one appears to be more vulnerable to extinction?
What does the term ‘Frugivorous’ mean?
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?
Is it possible that productivity and diversity of a natural community remain constant over a time period of, say one hundred years?
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.
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?
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 ______.
Distribution of diversity on earth shows that biodiversity from higher latitudes to lower latitudes ______.
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 ______.
Who observed that within a region, species richness increased with increasing explored area, to a certain limit?
When pre-reproductive and post - reproductive age group is same in structure, the population is______.
