Friday, June 1, 2012

Give a dog a bone!

http://www.americanscientist.org/issues/id.15294,y.0,no.,content.true,page.1,css.print/issue.aspx


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MARGINALIA

Do the Eyes Have It?

Dog domestication may have helped humans thrive while Neandertals declined


"Mellars and French compared the number and sizes of Neandertal and modern-human archaeological sites, as well as the density of tools and the weight per square meter of prey animals, represented by fossils, in those sites. They standardized their results for 1,000-year periods to compensate for the varying amounts of time that the different locations had been occupied. In every respect, modern humans surpassed Neandertals. In fact, the greater success of modern humans was so clear that, according to Mellars and French’s calculations, the human population increased tenfold over the 10,000-year overlap period. Modern humans thrived and Neandertals did not—even though Neandertals had lived in the European habitat for about 250,000 years before modern humans “invaded.” Why weren’t Neandertals better adapted to their environment than the newcomers?"


" Dogs may also have contributed more directly to human hunting success. To discover how big a difference dogs could make, Vesa Ruusila and Mauri Pesonen of the Finnish Game and Fisheries Institute investigated what may be the closest easily studied analog to a mammoth hunt: the Finnish moose hunt. Finns use large dogs such as Norwegian elkhounds or Finnish spitzes to find moose and keep them in place by barking until humans can approach and shoot them. In hunting groups of fewer than 10 people, the average carcass weight per hunter without dogs was 8.4 kilograms per day. With dogs, the yield went up to 13.1 kilograms per hunter per day—an increase of 56 percent. "

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