Really?
The U.S. Census Bureau claims that as of 1 July 2005, Orleans county had a population of 437,186. According to Wikipedia, 1,836 people died as a result of Katrina.
Counting ONLY Orleans county, that comes to 0.004%. Are you sure a hurricane of Katrina's magnitude would have only killed less than one half of one percent of hunter-gatherers living in the same area, without the benefit of early warning or outside assistance?
Most of the people who died in New Orleans were living off the compassion of other people, in a hunter-gatherer society, they wouldn't even have been alive when Katrina hit.
"The December 26 tsunami in Southeast Asia heightened international awareness of the region's indigenous peoples."
"Non-governmental organizations, governments, and anthropologists working in the region say many indigenous groups survived the tsunami because their traditional lore passed down from generation to generation prepared them to deal with natural disasters. Their survival demonstrated to the world the relevance of indigenous traditional knowledge."
"In communities where Western encroachment had destroyed traditional life ways, indigenous groups had no defense against the tsunami's destruction."