Sentence examples for population retreat from inspiring English sources

Whereas increasing temperatures can drive the expansion of populations towards higher altitudes and latitudes at the advancing edge of the species geographical distribution, growth decline and population retreat is more commonly reported at the low altitude/low latitude margin (Jump et al. 2009).

A likely suggestion is that divergence in mtDNA haplotypes did indeed arise following population retreat into glacial refugia during that last glacial maxima (∼25 000 ya), but that introgression following secondary contact of re-emergent populations caused subsequent mixing of divergent haplotypes in contact regions (located in Eastern Europe).

It is also debated whether abandoned areas were reoccupied by people from a different genetic background and whether this occurred from a Central Arctic ecological "core area" or regional "core areas" into which human populations retreated and restructured before expanding again into periodically refurbished marginal zones (20, 34).

Apparently different forms of T. pallescens have developed in isolation in different alpine islands in Europe, possibly as the populations retreated to alpine habitats with climate warming, as discussed above.

The Tigers put up strong resistance, forcing the troops, drawn mainly from the majority Sinhalese population, to retreat to their original positions in Nagar Kovil, Eluthumadduval and the Kilaly lagoon.

Populations likely retreated from temporarily unsuitable locations during glacial periods, becoming conjoined and admixed with other retreating populations or possibly with persisting populations.

High levels of pollutants such as mercury and P.C.B.s have been detected in tissue samples taken from wild olms, whose populations are retreating deeper underground as their habitat continues to be compromised.

In the northern hemisphere, distant glacial refugia, either southerly or coastal, or dry-climate refugia, on hilltops (Pielou 1991), may still contain relict genetic material of populations that retreated from changing climates in the geologic past.

In this latter case, populations might not retreat towards glacial refugia, only to perish because of periglacial conditions.

A demographic history inferred from DNA sequencing data indicates that C. simplicipinna experienced a recent population contraction without retreating to a common refugium during the last glacial period.

If he'd begun his work as far back as 1990, he could never have connected the colony's population drop with the retreat of the pack ice.