Aquatic ecology and Biodiversity

Unit 3- Population ecology

3.8. Mortality or death rate
Mortality refers to the number of individuals dieing in a population at a given time”. The size of population decreases due to mortality.

Mortality = Number of deaths birth

Average population

Vital index
It is the ratio between birth rate and death rate is called vital index. It helps to understand the rate of growth of a population.

Vital index = Birth x 100

Death