15,000 Years of vegetation change in the Bonneville basin: the Blue Lake pollen record |
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| Authors: | Lisbeth A Louderback David E Rhode |
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| Institution: | 1. Department of Anthropology, University of Washington, Box 353100, Seattle, WA 98195-3100, USA;2. Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, USA;1. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10601, USA;2. California State University, Fullerton, Department of Geological Sciences, Fullerton, CA 92834, USA;1. The Pennsylvania State University, Department of Anthropology & Institutes of Energy and the Environment, University Park, PA 16802, USA;2. University of Oregon, Department of Anthropology, Eugene, OR 97403, USA;3. University of Nevada, Department of Geography, Reno, NV 89557, USA;4. American Museum of Natural History, Department of Anthropology, New York, NY 10024, USA;1. Department of Geography, University of Nevada, Reno, NV 89557, USA;2. Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, USA;3. Dipartimento DAFNE, Università degli Studi della Tuscia, Viterbo 01100, Italy;4. Volcano Science Center, U.S. Geological Survey, Menlo Park, CA 94025, USA;1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA;2. Department of Geosciences, University of Arizona, Tucson, AZ, USA;3. Department of Earth Sciences, University of Oxford, Oxford, UK;4. Lamont-Doherty Earth Observatory, Columbia University, New York, NY, USA;5. Department of Geology and Geophysics, University of Wyoming, Laramie, WY, USA;6. Department of Geosciences, University of Massachusetts Amherst, Amherst, MA, USA;7. Department of Earth Sciences, University of Minnesota, Minneapolis, MN, USA;8. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an, China |
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| Abstract: | This paper contributes to the emerging picture of late Pleistocene and Holocene environmental change in the Bonneville basin, western North America, through analysis of pollen and sediments from the Blue Lake marsh system, a major wetland area located on the western margin of the Great Salt Lake desert. Analyses of data obtained from the upper 4 m of the Blue Lake core suggest that during the latest Pleistocene, when Lake Bonneville covered the Blue Lake site, pine and sagebrush dominated terrestrial plant communities. These steppe-woodland taxa declined in abundance after ～12 cal ka BP. Wetland plant communities developed at or nearby Blue Lake by ～11.9 cal ka BP and bulrush-dominated marshes were established no later than 10.8 cal ka BP. The Blue Lake wetlands largely desiccated during a dry and warm early middle Holocene ～8.3–6.5 cal ka BP. Climatic amelioration starting ～6.5 cal ka BP is marked principally by a local return of marshes at the expense of playa and grass meadow communities, and a regional increase in sagebrush relative to other dryland shrubs. Singleleaf pinyon pine migrated into the nearby Goshute Mountains after ～8 cal ka BP. Late Holocene fluctuations include cool intervals from ～4.4 to 3.4 and ～2.7 to 1.5 cal ka BP and warmer conditions from 3.4 to 2.7 cal BP and after 1.5 cal ka BP. |
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