He noticed similar patterns in kelp forest ecosystems when sea otter populations declined; the population of their prey, sea urchins, grew large, consuming enough kelp to drive away other animals that would normally feed on that seaweed.
Because of a lack of support from a breeding syndicate, such as the one in existence for the Mérens horse, once the need for a multipurpose breed declined, the population of the Castillonnais dwindled.
In the midst of these declines, the populations of some critically endangered primate species have increased.
As new star formation has declined and the population of aging, cooler red stars is proportionally much larger, the universe has moved into a middle green period.
But as oil revenues have declined and the population of young people seeking jobs has exploded, this bargain can't hold much longer.
The boom towns declined and the population of Dawson City fell away.
Following six decades of decline, the population of the Iberian lynx, considered the world's most endangered feline, has seen its numbers swell from only 52 adult cats in 2002 to 156 a decade later, IUCN said.
After another decade of decline, the population of St . Louisstands at 319,000, according to the latest census figures, less than half the peak of 857,000 in the decade when the airport was built.
At this (numerical) rate of decline, the population of Detroit will hit zero in 2040.
