The phrase "decreased population" is grammatically correct and can be used in written English.
It refers to a population that has become smaller in numbers over time. Example: The government's policies led to a decreased population in the rural areas.
The ghosts of Butte are some years away from taking over the town, but a good many local citizens view the boarded-up houses, the closed stores, and the decreased population as ominous signs.
Tehrān's slowed growth, owing in part to a general trend of suburbanization, resulted in a physical deterioration and decreased population in the city's central areas.
In addition, when reserve area decreased, population losses and losses per unit area increased disproportionately.
Loss of pond habitat decreased population growth rate, with greater decreases associated with loss of permanent and semi-permanent habitat.
One readily finds that any species with an increased intraspecies parameter, x 1, has a decreased population, P, and increases the population of Q.
Roads impact populations at many levels, with direct road mortality and barrier effect contributing to decreased population abundance, higher isolation and subdivision, and therefore to increased extinction risk.
But hunting and development of coastal areas decreased populations.
Following improved hygiene and other measures that decreased populations of non-native rats, the plague mostly disappeared from these cities.
Increased adiposity and decreased insulin sensitivity were found to be correlated with decreased populations of VAT Tregs.
Warmer temperatures are associated with decreased populations in soil and on trees.
But rural officials argue that with a decreasing population and few businesses, there are few taxes to collect.
