TY - JOUR
T1 - Palynological evidence for the historic expansion of juniper and desert shrubs in Arizona, U.S.A.
AU - Davis, Owen K.
AU - Turner, Raymond M.
N1 - Funding Information:
We gratefully acknowledge the assistance and cooperation of James L. Dick, Phelps Dodge Corporation; Dave Bancroft, Arizona Game and Fish Department; John P. Reid, Tuzigoot National Monument; and Herb Young, Clarkdale Arizona. Tony Burgess and Sue Archias edited an early draft of the manuscript. Historical photographs used in this study were supplied by the Arizona Historical Society, Tucson, Arizona, and the National Park Service Western Archaeology and Conservation Center, Tucson, Arizona. This research could not have been completed without the support of the NSF Accelerator Facility for Radioisotope Analysis, which is supported by NSF Regional Instrumentation grant CHE 78-118576.
PY - 1986/12
Y1 - 1986/12
N2 - Analysis of the sediment of Pecks Lake, Yavapai County, Arizona, has permitted the first reported palynological evidence for the historic expansion of juniper and desert shrubs in the American Southwest. The palynological evidence is supported by the comparison of modern and historical photographs, which shows the regional expansion of pinyon-juniper woodland, and the local increase of mesquite and creosote bush. A gradual increase in juniper pollen percentages began over 2000 years ago, but the rate of increase abruptly accelerated after the historic introduction of grazing animals. In contrast, juniper percentages did not increase during a prehistoric interval of intense disturbance by humans, about A.D. 1200, and a different weed flora was present. Prehistorically, water depth was greatest at ca. 600 B.C. and was lowest just prior to the arrival of Europeans. Regional climate has gradually cooled since the beginning of the record at 2630 B.P.
AB - Analysis of the sediment of Pecks Lake, Yavapai County, Arizona, has permitted the first reported palynological evidence for the historic expansion of juniper and desert shrubs in the American Southwest. The palynological evidence is supported by the comparison of modern and historical photographs, which shows the regional expansion of pinyon-juniper woodland, and the local increase of mesquite and creosote bush. A gradual increase in juniper pollen percentages began over 2000 years ago, but the rate of increase abruptly accelerated after the historic introduction of grazing animals. In contrast, juniper percentages did not increase during a prehistoric interval of intense disturbance by humans, about A.D. 1200, and a different weed flora was present. Prehistorically, water depth was greatest at ca. 600 B.C. and was lowest just prior to the arrival of Europeans. Regional climate has gradually cooled since the beginning of the record at 2630 B.P.
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U2 - 10.1016/0034-6667(86)90026-6
DO - 10.1016/0034-6667(86)90026-6
M3 - Article
AN - SCOPUS:0022845979
VL - 49
SP - 177
EP - 193
JO - Review of Palaeobotany and Palynology
JF - Review of Palaeobotany and Palynology
SN - 0034-6667
IS - 3-4
ER -