'regional populations' is correct and usable in written English.
You can use it to refer to the populations of different regions, for example, "Studies have shown that regional populations are affected differently by economic downturns."
Take the humble switchgrass, a summer perennial that is grown all over the United States, but in distinct regional populations.
This book, sponsored by the National Audubon Society, which identifies 810 North American species and 350 regional populations, is illustrated by the author, a well-known painter of birds.
A gradual emergence of the Neanderthals from earlier regional populations of archaic humans can be inferred, probably across their entire geographic range.
And its pricing is winning the hearts of Russia's regional populations through pricing.
Until recently, no suitable comprehensive measure existed to assess curricular effectiveness, attitude change, or descriptions of regional populations.
Population projections of the two species confirmed the potential for large-scale conservation to sustain regional populations.
With short-run regional populations given, these short-run regional employment movements are expressed as short-run movements in the regional employment rate and/or participation rate.
Exploring the permeability of habitat edges will improve our understanding of dispersal within fragmented landscapes and enhance efforts to conserve regional populations of amphibians.
Creation of ecological networks is advocated to increase the viability of regional populations and their resilience to climatic and land-use change with associated habitat fragmentation and loss.
Fig. 1 Annual global populations of mammalian livestock (a) and poultry (b), in billions, for 1990 2013 period Fig. 2 Annual regional populations of dairy cattle, meat/other cattle, and swine.
As observed by Giesecke and Madden (2013), this translates to near exogeneity of the regional labor wage rate, with long-run regional employment adjusting via long-run movements in regional populations.
