"regional fragmentation" is correct and can be used in written English.
You can use it to refer to the division of a region into smaller components, often caused by cultural, economic, or geopolitical differences. For example, "The regional fragmentation of Europe in the 16th century caused a series of wars and conflicts."
They feared that wider regional fragmentation would bleed into their own ethnic regions.
In the face of regional fragmentation, Buenos Aires sent Nicolás de Herrera to Asunción to frighten, bluff, or bribe Paraguay into a union of unequals.
The paper also traces Ireland's transition through market reform, regional fragmentation, and looks onwards to the EU internal market for electricity.
The Iraqi opposition -- with its Sunni, Shiite and competing Kurdish factions -- mirrors the ethnic and regional fragmentation that has bedeviled this Frankenstein monster of a country since it was cobbled together after World War I from three Ottoman Turkish provinces: Kurdish Mosul in the north, Sunni Baghdad in the center and Shiite Basra in the south.
Despite the vast and long-standing hopes that internet use might produce a "borderless" world, governments, civil society groups, transnational companies, and web users all complain of increasing regional fragmentation online, fearing that the Internet is "breaking up into loosely coupled islands of connectivity," as claimed by a recent World Economic Forum report.
A finer regional fragmentation currently is not possible due to lack of data for Africa, South America, Russia, and Canada.
Minor roads, including Class IV and Class V roads, contributed most to regional landscape fragmentation while high level roads had larger effect on vegetation dynamics in road effect zone.
And to avoid the risk of regional regulatory fragmentation undermining moves to establish a digital single market if individual European Member States feel compelled to introduce new rules at a national level.
We also share pride in Europe's digital capacities," said Ansip speaking at the launch, and noting that the aim of the DSM strategy is to remove barriers to digital growth — such as regional market fragmentation — which he asserted have been preventing European startups from scaling up to become "global companies".
Another feasible idea is to promote technological spillover by strengthening the diffusion effect of the industrial sectors, in which processes of domestic trade can play a role by adjusting the matching of production and demand, and also by reducing inter-regional market fragmentation (Zhang Hao, 2014).
However, in part due to incomplete phylogenetic and phylogeographic sampling and imprecise distribution models, little attention has been paid to whether regional-scale fragmentation (vicariance/allopatric) or local-scale expansions or niche shifts (peripatric) are the dominant speciation process within this sky-island system.
