New carbon dates link climatic change with human colonization and Pleistocene extinctions
Article Abstract:
The portion of the Pleistocene-Holocene transition (P/HT) in Alaska and Yukon Territory (AK-YT) most critical for large mammals and their forage occurred from 13, 500 to 11, 500 radiocarbon years before present. Interior AK-YT is unique for such a study, not also because of its location as a connecting link between the hemispheres and also, due to many plant and animal species encounters the outer limits of their ecological tolerance at these latitudes, thus often magnifying evidence of climatic-biotic shifts.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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Efficiency of equine express postal systems: relay riders over two millennia delivered mail with a remarkably consistent alacrity
Article Abstract:
The use of horses in the mail delivery process showed remarkable consistency in the speed and in the distance between horse changing stations. Through an understanding of equine physiology, the speed and distance combination ideal for optimal horse performance, is explained.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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