The phrase "a declining population of" is correct and usable in written English.
It can be used when discussing demographic trends, particularly when referring to a decrease in the number of individuals in a specific group or area.
Example: "The region is facing significant challenges due to a declining population of young professionals."
Alternatives: "a shrinking population of" or "a decreasing number of".
An unusual opportunity is afforded by three decades of individual-based data collected from a declining population of Antarctic fur seals in the South Atlantic.
The north has a declining population of an estimated 400 wolves, while Xinjiang and Tibet hold about 10,000 and 2,000 respectively.
Fewer than 80,000 pairs breed in North America, with most breeding on the northeast Atlantic coast and a declining population of less than 10,000 pairs breeding in the Great Lakes region.
We have shown that a declining population of a long-lived, endangered vertebrate suffers from substantial negative genetic effects.
We investigated the potential for blood parasites to impact upon their hosts at the immunological, physiological and population level during the non-breeding season using a declining population of yellowhammers Emberiza citrinella as a model.
LD is a pharmacologically inactive precursor, which is converted enzymatically to the neurotransmitter dopamine by a declining population of neurons in the substantia nigra, the most important site of the pathology of PD.
Eric Ripert, the chef at Le Bernardin, where I've never seen swordfish on the menu, told me one reason was a campaign by environmentalists years ago that sounded alarms about a declining population of the fish, which he said has since been reversed.
Genetic monitoring of the process of a declining population after the introduction of an infectious disease can provide insights into the demographic and evolutionary impact of a pathogen in a natural host population over time.
Recruitment from amongst Roman citizens had become greatly curtailed as a consequence of a declining population, "cripplingly numerous" categories of those exempted from military service and the spread of Christianity with its pacifist message.
Serving a rapidly declining population of 7,300, the town center is now dominated by three gigantic, and barely used, buildings in the shape of a triangle, a circle and a square, which, according to the Tokyo-based designer, symbolize man, woman and child.
This island supports a large declining population of black-legged kittiwakes (from 166,000 birds in 1981 to fewer than 25,000 in 1999; [ 55]).
