Free Newsletter
Register for our Free Newsletters
Newsletter
Zones
Advanced Composites
LeftNav
Aerospace
LeftNav
Amorphous Metal Structures
LeftNav
Analysis and Simulation
LeftNav
Asbestos and Substitutes
LeftNav
Associations, Research Organisations and Universities
LeftNav
Automation Equipment
LeftNav
Automotive
LeftNav
Biomaterials
LeftNav
Building Materials
LeftNav
Bulk Handling and Storage
LeftNav
CFCs and Substitutes
LeftNav
Company
LeftNav
Components
LeftNav
Consultancy
LeftNav
View All
Other Carouselweb publications
Carousel Web
Defense File
New Materials
Pro Health Zone
Pro Manufacturing Zone
Pro Security Zone
Web Lec
Pro Engineering Zone
 
 
 
News

Bison DNA helps explain extinctions

American Association For The Advancement Of Science (AAAS) : 29 November, 2002  (Company News)
Climate and environmental change, not human hunting pressure, served as the primary force that nearly eradicated ancient bison and drove sabre-toothed cats, mammoths and many other large mammals to extinction.
Climate and environmental change, not human hunting pressure, served as the primary force that nearly eradicated ancient bison and drove sabre-toothed cats, mammoths and many other large mammals to extinction.

Both the genetic diversity and the size of bison populations in present-day Alaska, Canada and Siberia, a landmass known as Beringia, underwent a catastrophic decline about 37 thousand years ago, well before large numbers of humans arrived in the New World, the scientists found. This diversity drop and population crash occurred at a time of environmental and climatic flux just before glaciers moved across much of North America.

Beth Shapiro and colleagues used mitochondrial DNA sequences from approximately 350 fossilized bison bones to record evolutionary processes from the Late Pleistocene 'in real-time.' In addition to extinction insights, their analysis shows that today's North American bison are descended from a small population isolated south of a glacial ice barrier that formed in central North America approximately 20 thousand years ago.
Bookmark and Share
 
Home I Editor's Blog I News by Zone I News by Date I News by Category I Special Reports I Directory I Events I Advertise I Submit Your News I About Us I Guides
 
   © 2012 NewMaterials.com
Netgains Logo