Navigation Links
Did the orientation of the continents hinder ancient settlement of the Americas?
Date:9/21/2011

In an intriguing original look at the history of the first Americans, a new study finds evidence that the north-south orientation of the American continents slowed the spread of populations and technology, compared to the east-west axis of Eurasia. The research, published in the American Journal of Physical Anthropology, is part of a special section which explores who the first Americans were and how they were able to settle in the last great unexplored habitat.

The research, by Sohini Ramachandran and Noah Rosenberg, from Brown University and Stanford University respectively, uses genetic information to explore the effects of continental axes and climates on human migration and adaptation across the Americas.

"It has been proposed that the east-west orientation of the Eurasian landmass aided the rapid spread of ancient technological innovations, while the north-south orientation of the Americas led to a slower diffusion of technology there," said Ramachandran. "Our research develops this idea, arguing that continental orientation influenced migration patterns and played an important role in determining the structure of human genetic variation and the distribution and spread of cultural traits."

The research supports the idea that technological diffusion was accelerated across Eurasia because populations with the same latitude experience similar climates, making adaptation to new locations easier for domesticated animals, plants and consequently humans. Alternatively, migrating along lines of longitude involves adapting to new climates.

"The idea that technology was diffused along latitudinal lines was proposed by Jared Diamond in 1997, but if this is correct and the spread of technology was accompanied by human migrations it follows that a comparative study into genetic variation would reveal a signature of greater genetic differences between populations along lines of longitude in the Americas than that in Eurasia along lines of latitude," said Ramachandran.

To test this hypothesis the team analysed genetic variation data from 68 populations, 39 from Eurasia and 29 from Native Americans. The data were used to identify relationships between the genetic and geographic distances between populations on each continent.

The results confirmed that the increase in genetic distances along lines of longitude in the Americas occurs over shorter geographic distances than the increase in genetic distances in Eurasia along lines of latitude.

"For many years anthropologists have asked who the first Americans were and how they were able to settle in the last major habitat open to humans," said Jeff Long, guest editor of the special section. "These six papers use genetics to answer these questions, not only confirming the genetic signatures of historic relationships between Native Americans and Eastern Asia, but also providing evidence for prehistoric migration and adaptation of settlers to the new world."


'/>"/>

Contact: Ben Norman
Lifesciencenews@wiley.com
44-124-377-0375
Wiley-Blackwell
Source:Eurekalert

Related biology news :

1. Orientation of antenna protein in photosynthetic bacteria described
2. Ancient magma superpiles may have shaped the continents
3. The continents as a heat blanket
4. Transporting juvenile salmon hinders adult migration
5. Trans fats hinder multiple steps in blood flow regulation pathways
6. Modern genetics vs. ancient frog-killing fungus
7. Genetic based human diseases are an ancient evolutionary legacy
8. 6,000km trip to reveal clues to ancient migration
9. Dry spells spelled trouble in ancient China
10. Ancient African exodus mostly involved men, geneticists find
11. Male crickets with bigger heads are better fighters, study reveals, echoing ancient Chinese text
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/8/2017)... 2017  Aware, Inc. (NASDAQ: AWRE ), a ... results for its quarter and year ended December 31, 2016. ... was $3.9 million compared to $6.9 million in the same ... 2016 was $0.6 million compared to $2.6 million in the ... of 2016 was $0.5 million, or $0.02 per diluted share, ...
(Date:2/7/2017)... Ind. , Feb. 7, 2017 Zimmer ... leader in musculoskeletal healthcare, will present at the LEERINK ... New York Palace Hotel on Wednesday, February 15, 2017 ... live webcast of the presentation can be accessed at ... replay following the conference via Zimmer Biomet,s Investor Relations ...
(Date:2/2/2017)... Feb. 2, 2017   TapImmune, Inc. ... company specializing in the development of innovative peptide ... of cancer and metastatic disease, announced today it ... manufacturing of a second clinical lot of TPIV ... receptor alpha. The manufactured vaccine product will be ...
Breaking Biology News(10 mins):
(Date:2/22/2017)... ... February 22, 2017 , ... ProMIS Neurosciences (“ProMIS” or the ... diseases, today announced it has issued a scientific white paper entitled “Results from ... series of commentaries from ProMIS’s scientific team offering insight into the Company’s product ...
(Date:2/22/2017)... Origin (Origin Agritech, LLC, a subsidiary of Origin Agritech ... Arcadia (Arcadia Biosciences, Inc., NASDAQ: RKDA), a ... productivity traits and nutritional products, today announced their collaboration to achieve ... China to the United States ... ...
(Date:2/22/2017)... and SAN DIEGO , Feb. ... "Company") (OTCQB:CELZ) announced today expansion of its translational ... cell product through establishment of laboratory facilities in ... at the San Diego BioLabs facility, a biotechnology ... Novartis, and Sanofi. In November 2016, ...
(Date:2/21/2017)... ... February 21, 2017 , ... During HIMSS 2017, ... health applications, announced a partnership with Redox, a leader in cloud-based healthcare integration ... clinical systems while keeping data secure in the cloud. , The digital health ...
Breaking Biology Technology: