The human population of Africa has never approached the size that the continent seems capable of supporting. ... An FAO survey published in 1991 reported that only 22 percent of land in Africa suitable for agriculture was actually in production (the comparable figure for south-east Asia is 92 per cent).
From the time that Europeans first set foot in Africa, travelers have commented upon what they saw as an excessive interest in sex among Africans.
I spent some time looking for accounts by recent tourists visiting Ukara Island, but it became apparent that very few people go there, which is not surprising since people on holiday generally visit big cities or go to less crowded places to relax. We tend to think of islands as being less crowded (and thus more relaxing) than mainlands because they are less convenient to get to, but in Africa, apparently, things work the opposite. Being inconveniently far out in Lake Victoria makes life healthier and less risky than being on the mainland.
Has the Ukaran culture spread with the steady flow of Ukarans to the mainland of Africa? Evidently, no. Phil Raikes wrote in 1986:
This provides a very clear example of Esther Boserup's contention that necessity in the form of population pressure is the mother of agricultural innovation. Further evidence for this comes from the fact that Ukara Islanders who migrate to the mainland, where population density is far lower, promptly drop their labour-intensive methods (over ten hours per day throughout the year) for the much easier methods practised on the mainland.
I'm not sure what the ultimate lessons are from Ukara Island, but the place is worth thinking about.