It means that people in a given area are going away; like subtracting. the population goes down as more people leave the area.
The decline of moose population followed sooner or later by a decline in the wolves population because the is less for the wolves.
There was a decline in the population as a result of the war.
Yes unless there was immigration, the country would have a declining population.
In the Great Lakes area, moose are often a large part of the diet of wolves. Therefore a decline in the wolf population would naturally follow the decline of the moose population on Isle Royale.
disease.
They are in a massive population decline.
A natural cause of decline in a population could be disease outbreak or an epidemic. Diseases can spread rapidly through a population, resulting in a significant decrease in the number of individuals. This decline in population can occur in both plants and animal species.
population
disease.
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"endangered" or "threatened" depending on the severity of the decline.
When more people in a population are dying than are being born.