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Question
Which of the following is an example of indirect method of estimating the population density?
Which of the following is an example of indirect method of estimating the population density?
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Solution
The correct option is C Estimating the population density of tigers based on pug marks and faecal pellets
Population size is technically called population density. It is generally represented as ‘N’.
The most appropriate measure of population density is generally in terms of number. Counting all the birds in a bird sanctuary is an example of determining the density based on number.
Though population density is generally calculated in terms of number, sometimes it is meaningless. For example, in a particular area there are 200 carrot grass plants, but only a single Banyan tree with a large canopy. If population density in terms of number is considered, then the density of carrot grass plants is certainly higher than the Banyan tree, but the ecological role of the Banyan tree in that area cannot be underestimated. Therefore, considering the number of individuals may not always be apt. In this case, the parameter biomass is more meaningful. The biomass of a single Banyan tree is far more than the 200 carrot grass plants.
Sometimes when the population is huge and counting is impossible due to some reason or very time-consuming, relative densities are considered instead of absolute population densities. For example, the number of fish caught per trap is a good measure of its total population density in the lake.
The tiger census in our national parks and tiger reserves maintains a count. Population density of tigers in an area is usually estimated based on the pugmarks and faecal pellets. This is an indirect method of estimating the population density without actually counting or seeing the organisms.
Population size is technically called population density. It is generally represented as ‘N’.
The most appropriate measure of population density is generally in terms of number. Counting all the birds in a bird sanctuary is an example of determining the density based on number.
Though population density is generally calculated in terms of number, sometimes it is meaningless. For example, in a particular area there are 200 carrot grass plants, but only a single Banyan tree with a large canopy. If population density in terms of number is considered, then the density of carrot grass plants is certainly higher than the Banyan tree, but the ecological role of the Banyan tree in that area cannot be underestimated. Therefore, considering the number of individuals may not always be apt. In this case, the parameter biomass is more meaningful. The biomass of a single Banyan tree is far more than the 200 carrot grass plants.
Sometimes when the population is huge and counting is impossible due to some reason or very time-consuming, relative densities are considered instead of absolute population densities. For example, the number of fish caught per trap is a good measure of its total population density in the lake.
The tiger census in our national parks and tiger reserves maintains a count. Population density of tigers in an area is usually estimated based on the pugmarks and faecal pellets. This is an indirect method of estimating the population density without actually counting or seeing the organisms.
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