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Question

Which one of the following formulae correctly represents the relationship between population density and the processes that influence it?

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

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