What is meant by the term “doubling time” and how did changing values for N0 aff

Question

What is meant by the term “doubling time” and how did changing values for N0 affect the doubling time of a population? Doubling time is the amount of time needed for a population to double in size; increasing N0 increased the doubling time. Doubling time is the amount of time needed for a population to double in size; increasing N0 did not change the doubling time. Doubling time is the time needed for an individual in the population to reproduce itself; increasing N0 decreased the doubling time. Doubling time is the time needed for an individual in the population to reproduce itself; increasing N0 did not change the doubling time. 3. The equations used in the tut0rial apply to populations over short time intervals. Why can they not be applied to populations over very long time periods? Real populations are affected by resource limitations that are not accounted for in the equations. The equations only apply to small populations and so populations become disqualified over long time periods as they get larger. Large values for time cannot be used in the equations without generating error. The equations are meant for theoretical applications only and cannot be used in the study of real populations. 4. How long will it take a population of 550 moose to double if 25 offspring are born and 14 moose die on average per year? 79.0 years 52.3 years 34.5 years 26.9 years

Explanation / Answer

Ans. 2. The doubling time is the time taken by a population to double itself in size. whereas No is the number of individuals it starts with therefore No would not be affected by the doubling time therefore the correct option is,

Doubling time is the amount of time needed for a population to double in size; increasing No did not change the doubling time

Ans 3. The equations used for short time intervals cannot be applied for long time period population growth simply because there are a lot of factors that influence population growth in a long term period like environmental disasters, mutations, gene drift etc, therefore the correct option should be :

Real populations are affected by resource limitations that are not accounted for in the equations.

Ans 4. The growth rate of a population could be calculate by:

birth rate - death rate

= 25 - 14 /550 x 100

= 2%

the initial population is 550 mooses, therefore it would become 1100 in approximately 35 years therefore the answer should be 34.5 years.

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