Several problems were thought to be the cause of their population decline.

The most important one was the general population decline in Russia.

In so doing, they are able to set up a lower limit on the rate of their population decline.

The city's overall population decline in that period was 23.4 percent.

The following years showed population decline, falling to a low of 10,634 in 1980.

The population decline of at least 50% over the last 24-30 years is projected to continue.

Many human induced changes are the cause for such a large population decline.

However, the net effect was a population decline, since more left than arrived.

This is because of the population decline that has occurred recently.

The three risk categories are based in large part on the rate of a species' population decline over the last 10 years.