Sentence examples for population levels were from inspiring English sources

We cannot be sure what the population levels were in the past and we need to do more detailed research.

When human population levels were low and technological abilities crude, societies' impact on the biosphere was relatively small.

Changes in methanogenic population levels were followed during startup of a full-scale, farm-based anaerobic sequencing batch reactor (ASBR) and these changes were linked to operational and performance data.

But even those population levels were not terribly high, as the barn owl had suffered a historical decline from the mid 1800s through to the late 1980s, as a result of increasingly intensive agriculture which affected barn owls' habitat and prey.

The data also don't give conservationists any sense of how many loggerheads there should be — what their natural population levels were before they were diminished by artificial light, commercial long-line fishing and other man-made threats.

Psl population levels were also monitored in cucumber plants treated and not treated with EB isolates.

Population levels are therefore strongly influenced by the amounts of winter-spring rainfall; dry years yield few young birds.

"The only way to reach sustainable population levels is to improve public health," he says.

This is expected to continue to drop until 2017, so it's feasible that the population levels are having an impact on the number of university applications.

Assessing patterns of connectivity at the community and population levels is relevant to marine resource management and conservation.

In both the mentioned figure and table, population levels are held static.