Mauntschas Mire, Switzerland 140Yr Testate Amoeba DWT Reconstruction Lamentowicz, M.; van der Knaap, W.O.; Lamentowicz, L.; van Leeuwen, J.F.N.; Mitchell, E.A.D.; Goslar, T.; Kamenik, C. Lamentowicz, M. van der Knaap, W.O. Lamentowicz, L. van Leeuwen, J.F.N. Mitchell, E.A.D. Goslar, T. Kamenik, C. Other Hydroclimate Reconstruction hydrology earth science/paleoclimate/climate reconstructions|paleolimnology (water table depth,testate amoebae assemblage,unspecified margin of error,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (water table depth,testate amoebae assemblage,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/reconstructions (Mauntschas Mire>LATITUDE 46.4902>LONGITUDE 9.8546) We present the first testate amoeba-based palaeohydrological reconstruction from the Swiss Alps, and the first depth to the water table (DWT) calibration dataset for this region. Compared to existing models, our new calibration dataset performs well (RMSEP=4.88), despite the length of the water table gradient covered (53 cm). The present-day topography and vegetation of the study mire Mauntschas suggest that it is partly ombrotrophic (large Sphagnum fuscum hummocks, one of which was the coring site) but mostly under the minerotrophic influence of springs in the mire and runoff from the surrounding area. Ombrotrophic Sphagnum fuscum hummocks developed at the sampling site only during the last 50 years, when testate amoebae indicate a shift towards dry and/or acid conditions. Prior to AD 1950 the water table was much higher, suggesting that the influence of the mineral-rich water prevented the development of ombrotrophic hummocks. The reconstructed DWT correlated with Pinus cembra pollen accumulation rates, suggesting that testate amoebae living on the mire and P. cembra growing outside of it partly respond to the same factor(s). Finally, temperature trends from the nearby meteorological station paralleled trends in reconstructed DWT. However, contrary to other studies made on raised bogs of northwestern Europe, the highest correlation was observed for winter temperature, despite the fact that testate amoebae would more logically respond to moisture conditions during the growing season. The observed correlation with winter temperature might reflect a control of winter severity on surface moisture during at least the first part of the growing season, through snow melt and soil frost phenomena influencing run-off. More ecohydrological work on subalpine mires is needed to understand the relationships between climate, testate amoebae and peatland development. STUDY NOTES: Depth to Water Table (DWT) reconstruction for Mauntschas mire in the Swiss Alps. All calculations are based on percentage of each species of Testate Amoeba in a sample (See Booth et al., 2010). Age model is from Goslar et al. (2009). Depth to Water Table (DWT) is dependent on vegetation season temperature and summer water deficit, providing a mixed temperature and precipitation signal. Mauntschas is a Sphagnum mire located near St. Moritz in the Upper Engadin valley, southeastern Swiss Alps, ~10 ha in size. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lamentowicz, M. Investigator : van der Knaap, W.O. Investigator : Lamentowicz, L. Investigator : van Leeuwen, J.F.N. Investigator : Mitchell, E.A.D. Investigator : Goslar, T. Investigator : Kamenik, C. 2010-10-20 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9719 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.txt English https://www.ncdc.noaa.gov/paleo/study/9719 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/switzerland/mauntschas2010dwt.txt Lamentowicz, M., W. Van Der Knaap, L. Lamentowicz, J.F.N. Van Leeuwen, E.A.D. Mitchell, T. Goslar, and C. Kamenik. 2010. A near-annual palaeohydrological study based on testate amoebae from a sub-alpine mire: surface wetness and the role of climate during the instrumental period. J. Quaternary Sci., Vol. 25 pp. 190-202. ISSN 0267-8179. START YEAR: 1864 AD * END YEAR: 2003 AD 9.8546 46.4902 9.8546 46.4902