Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)

Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a consta...
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Autor*in:	von Gunten, Lucien [verfasserIn] Heiri, Oliver Bigler, Christian van Leeuwen, Jacqueline Casty, Carlo Lotter, André F. Sturm, Michael

Format:	Artikel
Sprache:	Englisch

Erschienen:	2007

Schlagwörter:	Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions

Anmerkung:	© Springer Science+Business Media, Inc. 2007

Übergeordnetes Werk:	Enthalten in: Journal of paleolimnology - Springer Netherlands, 1988, 39(2007), 3 vom: 12. Apr., Seite 283-299
Übergeordnetes Werk:	volume:39 ; year:2007 ; number:3 ; day:12 ; month:04 ; pages:283-299

Links:	Volltext

DOI / URN:	10.1007/s10933-007-9103-4

Katalog-ID:	OLC2071087836

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520			\|a Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends.
650		4	\|a Alpine lake
650		4	\|a Diatoms
650		4	\|a Chironomids
650		4	\|a Pollen
650		4	\|a Ice-cover
650		4	\|a Seasonal temperature reconstructions
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700	1		\|a van Leeuwen, Jacqueline \|4 aut
700	1		\|a Casty, Carlo \|4 aut
700	1		\|a Lotter, André F. \|4 aut
700	1		\|a Sturm, Michael \|4 aut
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allfields	10.1007/s10933-007-9103-4 doi (DE-627)OLC2071087836 (DE-He213)s10933-007-9103-4-p DE-627 ger DE-627 rakwb eng 570 930 VZ 14 13 12 ssgn von Gunten, Lucien verfasserin aut Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2007 Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions Heiri, Oliver aut Bigler, Christian aut van Leeuwen, Jacqueline aut Casty, Carlo aut Lotter, André F. aut Sturm, Michael aut Enthalten in Journal of paleolimnology Springer Netherlands, 1988 39(2007), 3 vom: 12. Apr., Seite 283-299 (DE-627)131173782 (DE-600)1140218-0 (DE-576)090827198 0921-2728 nnns volume:39 year:2007 number:3 day:12 month:04 pages:283-299 https://doi.org/10.1007/s10933-007-9103-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_40 GBV_ILN_154 GBV_ILN_2027 GBV_ILN_4012 AR 39 2007 3 12 04 283-299
spelling	10.1007/s10933-007-9103-4 doi (DE-627)OLC2071087836 (DE-He213)s10933-007-9103-4-p DE-627 ger DE-627 rakwb eng 570 930 VZ 14 13 12 ssgn von Gunten, Lucien verfasserin aut Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2007 Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions Heiri, Oliver aut Bigler, Christian aut van Leeuwen, Jacqueline aut Casty, Carlo aut Lotter, André F. aut Sturm, Michael aut Enthalten in Journal of paleolimnology Springer Netherlands, 1988 39(2007), 3 vom: 12. Apr., Seite 283-299 (DE-627)131173782 (DE-600)1140218-0 (DE-576)090827198 0921-2728 nnns volume:39 year:2007 number:3 day:12 month:04 pages:283-299 https://doi.org/10.1007/s10933-007-9103-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_40 GBV_ILN_154 GBV_ILN_2027 GBV_ILN_4012 AR 39 2007 3 12 04 283-299
allfields_unstemmed	10.1007/s10933-007-9103-4 doi (DE-627)OLC2071087836 (DE-He213)s10933-007-9103-4-p DE-627 ger DE-627 rakwb eng 570 930 VZ 14 13 12 ssgn von Gunten, Lucien verfasserin aut Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2007 Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions Heiri, Oliver aut Bigler, Christian aut van Leeuwen, Jacqueline aut Casty, Carlo aut Lotter, André F. aut Sturm, Michael aut Enthalten in Journal of paleolimnology Springer Netherlands, 1988 39(2007), 3 vom: 12. Apr., Seite 283-299 (DE-627)131173782 (DE-600)1140218-0 (DE-576)090827198 0921-2728 nnns volume:39 year:2007 number:3 day:12 month:04 pages:283-299 https://doi.org/10.1007/s10933-007-9103-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_40 GBV_ILN_154 GBV_ILN_2027 GBV_ILN_4012 AR 39 2007 3 12 04 283-299
allfieldsGer	10.1007/s10933-007-9103-4 doi (DE-627)OLC2071087836 (DE-He213)s10933-007-9103-4-p DE-627 ger DE-627 rakwb eng 570 930 VZ 14 13 12 ssgn von Gunten, Lucien verfasserin aut Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2007 Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions Heiri, Oliver aut Bigler, Christian aut van Leeuwen, Jacqueline aut Casty, Carlo aut Lotter, André F. aut Sturm, Michael aut Enthalten in Journal of paleolimnology Springer Netherlands, 1988 39(2007), 3 vom: 12. Apr., Seite 283-299 (DE-627)131173782 (DE-600)1140218-0 (DE-576)090827198 0921-2728 nnns volume:39 year:2007 number:3 day:12 month:04 pages:283-299 https://doi.org/10.1007/s10933-007-9103-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_40 GBV_ILN_154 GBV_ILN_2027 GBV_ILN_4012 AR 39 2007 3 12 04 283-299
allfieldsSound	10.1007/s10933-007-9103-4 doi (DE-627)OLC2071087836 (DE-He213)s10933-007-9103-4-p DE-627 ger DE-627 rakwb eng 570 930 VZ 14 13 12 ssgn von Gunten, Lucien verfasserin aut Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) 2007 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer Science+Business Media, Inc. 2007 Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions Heiri, Oliver aut Bigler, Christian aut van Leeuwen, Jacqueline aut Casty, Carlo aut Lotter, André F. aut Sturm, Michael aut Enthalten in Journal of paleolimnology Springer Netherlands, 1988 39(2007), 3 vom: 12. Apr., Seite 283-299 (DE-627)131173782 (DE-600)1140218-0 (DE-576)090827198 0921-2728 nnns volume:39 year:2007 number:3 day:12 month:04 pages:283-299 https://doi.org/10.1007/s10933-007-9103-4 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_40 GBV_ILN_154 GBV_ILN_2027 GBV_ILN_4012 AR 39 2007 3 12 04 283-299
language	English
source	Enthalten in Journal of paleolimnology 39(2007), 3 vom: 12. Apr., Seite 283-299 volume:39 year:2007 number:3 day:12 month:04 pages:283-299
sourceStr	Enthalten in Journal of paleolimnology 39(2007), 3 vom: 12. Apr., Seite 283-299 volume:39 year:2007 number:3 day:12 month:04 pages:283-299
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions
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container_title	Journal of paleolimnology
authorswithroles_txt_mv	von Gunten, Lucien @@aut@@ Heiri, Oliver @@aut@@ Bigler, Christian @@aut@@ van Leeuwen, Jacqueline @@aut@@ Casty, Carlo @@aut@@ Lotter, André F. @@aut@@ Sturm, Michael @@aut@@
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author	von Gunten, Lucien
spellingShingle	von Gunten, Lucien ddc 570 ssgn 14 misc Alpine lake misc Diatoms misc Chironomids misc Pollen misc Ice-cover misc Seasonal temperature reconstructions Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)
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topic_title	570 930 VZ 14 13 12 ssgn Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland) Alpine lake Diatoms Chironomids Pollen Ice-cover Seasonal temperature reconstructions
topic	ddc 570 ssgn 14 misc Alpine lake misc Diatoms misc Chironomids misc Pollen misc Ice-cover misc Seasonal temperature reconstructions
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title	Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)
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title_full	Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)
author_sort	von Gunten, Lucien
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author_browse	von Gunten, Lucien Heiri, Oliver Bigler, Christian van Leeuwen, Jacqueline Casty, Carlo Lotter, André F. Sturm, Michael
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title_sort	seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (lej da la tscheppa, switzerland)
title_auth	Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)
abstract	Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. © Springer Science+Business Media, Inc. 2007
abstractGer	Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. © Springer Science+Business Media, Inc. 2007
abstract_unstemmed	Abstract We analysed a 42 cm long sediment record from Lej da la Tscheppa, a high-altitude lake (2,616 m a.s.l.) in the Upper Engadine valley (Switzerland) for subfossil diatoms, chironomids and pollen. The chronology of the top 21 cm of the record was established using 210Pb analysis using a constant-rate-of-supply model, and validated with 137Cs measurements and the content of spheroidal carbonaceous particles. A tentative chronology for the lower part of the core was obtained through extrapolation of the sedimentation rates in the uppermost part of the record. Pollen assemblages in the record reflect regional changes in forestation and land-use patterns in the Upper Engadine valley and show no evidence of significant local human activity in the lake’s catchment. Diatom assemblages record a distinct increase in planktonic taxa since the early 19th century, suggesting a decrease in the duration of ice-cover. In contrast, chironomid assemblages remained stable during a large part of the record. We applied an established chironomid-based July air temperature transfer function and a newly developed diatom-based spring air temperature transfer function to reconstruct past seasonal air temperature changes at Lej da la Tscheppa. The reconstructions indicate a diatom-inferred warming trend in spring temperatures during the past ca. 400 years, whereas chironomid-inferred summer temperatures suggest a slight cooling trend. These biota-based reconstructions are in good agreement with the centennial-scale temperature trend in an independent reconstruction of regional temperatures in the Upper Engadine region based on instrumental records and documentary proxy evidence from the Alps. Our results suggest that, in high-altitude lakes, independent chironomid- and diatom-based seasonal temperature reconstruction is possible and can be successfully used to track seasonal temperature trends. © Springer Science+Business Media, Inc. 2007
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title_short	Seasonal temperatures for the past ∼400 years reconstructed from diatom and chironomid assemblages in a high-altitude lake (Lej da la Tscheppa, Switzerland)
url	https://doi.org/10.1007/s10933-007-9103-4
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