Which of the following is not an example of using relative density to ...
Sometimes, for certain ecological investigations, there is no need to know the absolute population densities. Relative densities serve the purpose equally well. In this case, population size is indirectly estimated without actually counting them. For example, the number of fishes caught per trap is good enough measure of its total population density in the lake. The tiger census in our National parks and tiger reserves is often based on pug marks (animal's foot print) and faecal pellets.
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Which of the following is not an example of using relative density to ...
Using Relative Density to Measure Population Density
Relative density is a method of measuring population density by comparing the number of individuals of a particular species in a given area to the number of individuals of other species in that same area. This method can be used to estimate the population density of a wide variety of organisms, from tigers to bacteria.
Examples of Using Relative Density to Measure Population Density
- Counting pugmarks of tigers to find population density of tigers in a forest: This method can be used to estimate the number of tigers in a particular area by counting the number of pugmarks (footprints) left by tigers in that area. By comparing the number of tiger pugmarks to the number of pugmarks left by other animals, such as deer or wild boar, researchers can estimate the relative density of tigers in the area.
- Counting the number of fishes caught in a trap to find population density of fishes in a lake: This method can be used to estimate the number of fish in a lake by catching a sample of fish and counting them. By comparing the number of fish caught to the area of the lake, researchers can estimate the relative density of fish in the lake.
- Measuring biomass of phytoplanktons in 1cc water to find out population density of phytoplanktons in a lake: This method can be used to estimate the number of phytoplankton in a lake by measuring the biomass (total weight) of phytoplankton in a small sample of water. By comparing the biomass of phytoplankton to the volume of water, researchers can estimate the relative density of phytoplankton in the lake.
Not an Example of Using Relative Density to Measure Population Density
- Measuring biomass of bacterial culture to find out population density of bacteria in a petri dish: This method is not an example of using relative density to measure population density because it does not involve comparing the number of individuals of one species to the number of individuals of other species in the same area. Instead, it involves measuring the total biomass of a bacterial culture in a petri dish to estimate the population density of bacteria.
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