It is called a limiting factor.
it is an environmental factor that causes a population to decrease.
limiting factor
the factor that causes a population to stop increassing is called depopulation
its considered a limiting factor because it might have the power to decrease the numbers of the population, if one were to become infected.
Pollution was a small factor but the largest factor is the spread of the Asian Carp which feed on algae and surface insects. This causes a disruption in the entire river ecosystem all the way to the largemouth bass causing a decrease in available food and therefore a decrease in population.
limiting factor
the climate
More predators so the population would decrease :(
social factors
Famine
an abiotic factor affecting a biotic factor
teehee