How long will it take for the population of a certain country to double if its annual growth rate is 2%?

For example, a population with a 2% annual growth would have a doubling time of 35 years.

How do you calculate population growth per year?

If a population of people grew from 1000 to 1040 in one year, then the percent increase or annual growth rate is 40/1000 x 100 = 4 percent. Another way to show this natural growth rate is to subtract the death rate from the birth rate during one year and convert this into a percentage.

How do you calculate population growth from birth and death rate?

To calculate the growth rate, you simply subtract the death rate from the birth rate. In this case, the growth rate (r) of the emperor penguin population in Antarctica is 0.3 – 0.1 = 0.2 new individuals per existing individual, per year.

What are two ways to leave a population?

There are two types of migration:

• Immigration is the movement of individuals into a population from other areas. This increases the population size and growth rate.
• Emigration is the movement of individuals out of a population. This decreases the population size and growth rate.

What are limiting factors in a population?

A limiting factor is anything that constrains a population’s size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources.

Is food supply biotic or abiotic?

Abiotic factors are non-living physical and chemical elements in the ecosystem, such as sunlight, temperature, soil, water, and oxygen. Biotic factors are living or once-living organisms in the ecosystem, such as food, disease, competition, and predators.

What happens when the most limiting factor in an ecosystem is removed?

The most obvious result of the removal of the top predators in an ecosystem is a population explosion in the prey species. When prey becomes more scarce, the predator population declines until prey is again more abundant. Therefore, the two balance each other. When the predators are removed, prey populations explode.

When a population continues to grow past its carrying capacity the population will go extinct?

The population if exceed beyond the carrying capacity of an ecosystem, that occurs in the case of exponential growth the population reduces in number to an extent to extinction due to shortage of resources.

Which of these is the biggest threat to the survival of an ecosystem?

Climate change is quickly becoming the biggest threat to the long-term survival of America’s wildlife. Habitat loss, climate change, and a lack of biodiversity can all make ecosystems unhealthy, putting wildlife at greater risk for disease.