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  • (a) Study the flow chart given below and complete the equation that follows by identifying 1, 2, 3 and 4.

(a) Study the flow chart given below and complete the equation that follows by identifying 1, 2, 3 and 4.

N_{t+1}=N_{t}+\left \{ \left ( 1+2 \right )-\left ( 3+4 \right ) \right \}

(b) Mention the different ways by which the population density of different species can be measured.

 

 

 

 

 
 
 
 
 

Answers (1)

a) Nt+1 = Nt + [(B + I) – (D + E)]

b) Population density (designated as N), need not necessarily be measured in numbers only. Although the total number is generally the most appropriate measure of population density, it is in some cases either meaningless or difficult to determine.

In an area, if there are 200 Parthenium plants but only a single huge banyan tree with a large canopy, stating that the population density of banyan is low relative to that of Parthenium amounts to underestimating the enormous role of the Banyan in that community. In such cases, the percent cover or biomass is a more meaningful measure of the population size. The total number is not an easily adaptable measure if the population is huge and counting is impossible or very time-consuming.

Sometimes, for certain ecological investigations, there is no need to know the absolute population densities; relative densities serve the purpose equally well. For instance, the number of fish caught per trap is good enough to measure its total population density in the lake.

Population sizes can be estimated indirectly, without actually counting them or seeing them. The tiger census in our national parks and tiger reserves is often based on pug marks and fecal pellets.

Posted by

Priyanka Kumari

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