What is the importance of measuring the size of a population in a habitat or an ecosystem?

Explain with help of an example how percentage cover is a more meaningful measure of population size than mere numbers?

Measurement of population in a habitat determines the relative abundance of that particular species and the effect of the species on the available resources of habitat.

Percentage cover is more meaningful measure of population size than mere numbers because the relative abundance of the species is not only determined by no. of individual but also both i.e. relative abundance in no. and relative abundance in biomass.

For eg In unit area the number of a grass species individuals or relative abundance in number is high but not in relative abundance of biomass, if the same area have one or two ficus benghalensis (Bargad) tree as it is very low in relative abundance in number while high in relative abundance of biomass.

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