Indigenous Australian references
Google Search "isolated demes" which should lead to greater diversity
Sally R. Binford. Late Middle Paleolithic Adaptations and Their Possible Consequences BioScience 20: 280-283. http://www.jstor.org/stable/1295206
The Effect of Habitat Corridors on Rates of Transfer and Interbreeding between Vole Demes; Jon Aars and Rolf A. Ims; Ecology, Vol. 80, No. 5 (Jul., 1999), pp. 1648-1655
Emigration as a Possible Mechanism Permitting the Regulation of Population Density Below Carrying Capacity; William Z. Lidicker, Jr; The American Naturalist, Vol. 96, No. 886 (Jan. - Feb., 1962), pp. 29-33
Peter Lucich. 1996. Understanding Australian Kinship: Rewrite Rules or Homomorphisms? Journal of Quantitative Anthropology 6(1): 101-146.