isolation to specialisation while chaos to variation..

Although isolation is of great importance in the birth of new species, on the whole the largeness of area is still more important, especially for the production of species which shall prove capable of enduring for a long period, and of spreading widely. Throughout a great and open area, not only will there be a better chance of favorable variations, arising from the large number of individuals of the same species there supported, but the conditions of life are much more complex from the large number of already existing species; and if some of these many species become modified and improved, others will have to be improved in a corresponding degree, or they will be exterminated. Each new form, also, as soon as it has been much improved, will be able to spread over the open and continuous area, and will thus come into competition with many other forms. They will thus play a more important part in the changing history of the organic world. - C R Darwin

It maybe worthwhile to draw a parallel between nature and economic markets or even life. An environment in flux allows a greater probable chance to develop favorable variations to withstand imperils or unforeseen circumstances than that can be garnered from a cloistered or stable environment.