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          Institute: MPI für Evolutionsbiologie     Collection: Ecophysiology     Display Documents

ID: 3936.0, MPI für Evolutionsbiologie / Ecophysiology
The sediment record of the past 200 years in a Swiss high- alpine lake: Hagelseewli (2339 ma.s.l.)
Authors:Lotter, A. F.; Appleby, P. G.; Bindler, R.; Dearing, J. A.; Grytnes, J.-A.; Hofmann, W.; Kamenik, C.; Lami, A.; Livingstone, D. M.; Ohlendorf, C.; Rose, N.; Sturm, M.
Date of Publication (YYYY-MM-DD):2002-06
Title of Journal:Journal of Paleolimnology
Journal Abbrev.:J. Paleolimn.
Issue / Number:1
Start Page:111
End Page:127
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Sediment cores spanning the last two centuries were taken in Hagelseewli, a high-elevation lake in the Swiss Alps. Contiguous 0.5 cm samples were analysed for biological remains, including diatoms, chironomids, cladocera, chrysophyte cysts, and fossil pigments. In addition, sedimentological and geochemical variables such as loss-on-ignition, total carbon, nitrogen, sulphur, grain-size and magnetic mineralogy were determined. The results of these analyses were compared to a long instrumental air temperature record that was adapted to the elevation of Hagelseewli by applying mean monthly lapse rates. During much of the time, the lake is in the shadow of a high cliff to the south, so that the lake is ice-covered during much of the year and thus decoupled from climatic forcing. Lake biology is therefore influenced more by the duration of ice- cover than by direct temperature effects during the short open- water season. Long periods of ice-cover result in anoxic water conditions and dissolution of authigenic calcites, leading to carbonate-free sediments. The diversity of chironomid and cladoceran assemblages is extremely low, whereas that of diatom and chrysophyte cyst assemblages is much higher. Weak correlations were observed between the diatom and chrysophyte cyst assemblages on the one hand and summer or autumn air temperatures on the other, but the proportion of variance explained is low, so that air temperature alone cannot account for the degree of variation observed in the paleolimnological record. Analyses of mineral magnetic parameters, spheroidal carbonaceous particles and lead suggest that atmospheric pollution has had a significant effect on the sediments of Hagelseewli, but little effect on the water quality as reflected in the lake biota.
Free Keywords:diatoms; chironomids; cladocera; chrysophyte cysts; sedimentology; magnetism; SCP; temperature
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Ökophysiologie
External Affiliations:Univ Utrecht, Palaeobot & Palynol Lab, NL-3584 CD Utrecht, Netherlands
Univ Bern, Inst Plant Sci, CH-3013 Bern, Switzerland
Swiss Fed Inst Environm Sci & Technol, CH-8600 Dubendorf, Switzerland
Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside, England
Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden
Univ Liverpool, Environm Magnetism Lab, Liverpool L69 7ZT, Merseyside, England
Univ Bergen, Inst Bot, N-5007 Bergen, Norway
Austrian Acad Sci, Inst Limnol, A-5310 Mondsee, Austria
CNR, Ist Italiano Idrobiol, Pallanza, Italy
Univ Coll London, Environm Change Res Ctr, London WC1H 0AP, England
Identifiers:ISI:000178212200008 [ID-No:1]
ISSN:0921-2728 [ID-No:2]
LOCALID:2100/S 37812 [Listen-Nummer/S-Nummer]
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