@cicerone imposter,
The Melanesians are the group you are speaking of, (The group is the Papuan populations composed of about 45 separate sub groups). All of these populations originated in New Guinea and were the result of the second circum pacific migration of hominims.
The papuan group of sub populations migrated from New Guinea through the Solomons and then on to Fiji as one colonization spot about 30K ybp. They are the "original" people and the Polynesian (austrlonesian) are the latest at about 6Kbp and are genetically unrelated
These people were only recently tracked in their migration routes (2005) by tracking a lethal gene protein called the ABNORMAL-SPINDLE_LIKE MICROENCEPHALY ASSOCIATED PROTEIN (in short, the ASPM protein or the ASP-homolog)
This lethal gene protein occurs as its referred shape in as much as 45% of the present population and MAY be a sign of what was originally termed the "Human bottleneck" due to the Toba super volcano which reduced the population of the "originals" to as few as 40 people in the breeding cluster.
In that respect they're sorta like the AMISH in the presence and percent occurences of lethal genetic conditions.
Thats why the argument about Homo Florensis says that it coulda been a microencephalic and not a real species.
look up the ASPM and Fijians relationship. You may get a map of the tracings of migration by this genetic marker