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Question

Which of the following equations best represents the formula for calculating the change in population density?

A
Nt+1=Nt+ [(B +D) (I +E)]
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B
Nt=Nt+1 + [(B+D) (I+ E)]
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C
Nt+1=Nt + [(B+I) (D+ E)]
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D
Nt+1=Nt + [(B+I) + (D+ E)]
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Solution

The correct option is A Nt+1=Nt+ [(B +D) (I +E)]

Population density is the number of individuals per unit area at a given time. If the initial population density at time t is Nt, then the population density at time t+1 can be represented as

Nt+1=Nt + [(B+I) (D+ E)]Where,

B is natality i.e. number of births during a given time period

I is immigration i.e. number of individuals of the same species that enter a population from elsewhere during a given time period

D is mortality i.e. number of deaths during a given time period

E is emigration i.e. number of individuals of the same species that leave a population during a given time period.


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