Uncontacted Tribes Die Instantly After We Meet Them
...in Brazil, where 238 indigenous tribes have been contacted in the last several decades, and where between 23 and 70 uncontacted tribes are still living. A just-published report that takes a look at what happens after the modern world comes into contact with indigenous peoples isn’t pretty: Of those contacted, three quarters went extinct. Those that survived saw mortality rates up over 80 percent. This is grim stuff.
“Our analysis dramatically quantifies the devastating effects of European colonization on indigenous Amazonians. Not only did ~75 percent of indigenous societies in the Brazilian Amazon become extinct, but of the survivors, all show evidence of catastrophic population declines, the vast majority with mortality rates over 80 percent,” writes Marcus Hamilton of the University of New Mexico in a paper published in Scientific Reports.
originally posted by: LABTECH767
a reply to: soficrow
...some of these tribes may harbour pathogen's to which we have no immunity and in a grand reversal such thoughtless contact could very well start a new plague.
The extinction of these tribes should be cross referenced to areas which later became logged or settled for cattle ranching as well as most likely a few of these tribes were deliberatly exterminated.
originally posted by: BlueMule
It might be better if it was the other way around...
originally posted by: soficrow...in Brazil, where 238 indigenous tribes have been contacted in the last several decades, and where between 23 and 70 uncontacted tribes are still living. A just-published report that takes a look at what happens after the modern world comes into contact with indigenous peoples isn’t pretty: Of those contacted, three quarters went extinct. Those that survived saw mortality rates up over 80 percent. This is grim stuff.
(c) Post-contact population growth rates
Our results indicate that surviving indigenous populations in the Amazon Basin are remarkably robust and resilient to extrinsic perturbations, with approximately 85% of surviving populations exhibiting net growth over their post-contact time series, most growing at rates among the fastest recorded in any human population (~3–4% annual growth, Figure 3). However, not all of the recorded population growth is reproductive because some increases likely resulted from immigration and group fusioning. High rates of population growth will also occur after disease epidemics preferentially impact old and young individuals (i.e., non-reproductive), as the survivors will have the ability to reproduce quickly.
And, how did the writers of the report come about this information without risking even more damage?
On the other hand - if I were out trapsing through the Amazonian forestlands one day, and arrows, poison-tipped darts, spears or a bunch of ugly people started coming my way - I might be all for some napalm-or small pox-like intervention. - See more at: www.abovetopsecret.com...
Population data were obtained from Ricardo and Ricardo9, 10, 11, 12, 13, 14 and from the accompanying website of the Instituto Socioambiental (pib.socioambiental.org...). Each record included ethnolinguistic names, estimated population sizes, geographic coordinates for each group, language family, the year of contact, and the year that estimates were made. We classified populations as uncontacted until sustained peaceful contact had been made with neo-Brazilians, missionaries, or government workers. We excluded groups with populations straddling international borders because census counts did not include portions in other countries (n = 43).
We used sequential censuses of population observations to estimate the finite rate of population change, λ27, for each group for which multiple population estimates were available during the first 20 years after contact, using the following formula:
where N0 is the population size at the beginning of the interval, and Nt is the population size at the conclusion of the interval, and t is the number of years encompassed. We excluded groups with 6 years apart to avoid biased estimates. This resulted in a dataset comprised of 24 different ethnolinguistic groups with 67 total estimates of λ between the years 1923 and 2010.
originally posted by: Arktos1
Interesting study. There was also a part of the study that showed indigenous tribes surviving the initial crash not only recovered, but after a decade, have some of the highest population growth rates in the world.
...They did not contact anyone, and risked no further damage...
...Funny enough, during hypothetical discussions with my kids about space and time travel, this very issue arises as our main concern. Imagine traveling in either, or have visitors traveling here, and facing the fate as many indigenous populations?
...I wonder how our own immune systems would hold up to the distant past or future, or even other life in the cosmos. What do you think? If we visited, or were visited by others, would this study be relevant to our world population?
Our analysis dramatically quantifies the devastating effects of European colonization on indigenous Amazonians.