Eight hundred years of environmental changes in a high Alpine lake (Gossenköllesee, Tyrol) inferred from sediment records

Documentary and sediment records (diatoms, chrysophyte stomatocysts, plant pigments, carbon and nitrogen, metals and mineral magnetics) were used to reconstruct environmental changes in the high alpine lake Gossenkollesee (Tyrol, Austria) during the last 800 years. The records revealed complex interactions between human impact and climate. Gossenkollesee was predominantly influenced by land-use, which supplied nutrients to the lake. Documentary records report intensive sheep and cattle farming in the area around Gossenkollesee during medieval times. Pigments and chrysophyte stomatocysts indicated high nutrient concentrations prior to ca 1770 AD. First changes in land-use, however, were already detected ca 1670 AD. In 1675 AD the “Schwaighof” near Gossenkollesee, a perennial high altitude settlement, was sold to the Earl of Spaur, and farm management probably changed. After approx. 1770 AD in-lake production was reduced, indicating a decrease in land-use. According to historical records, the perennial settlement near Gossenkollesee was abandoned by at least 1890 AD. Gossenkollesee was also affected by fish stocking. Arctic charr (Salmo trutta morpha fario L.) was introduced into the lake, most probably at the end of the 15th century. A decline in carbon, nitrogen and the pigments alloxanthin (cryptophytes) and astaxanthin (grazers) indicate a significant removal of grazers by fish. Superimposed on human activity, climate changes have also had a significant impact on Gossenkollesee. High productivity during the 12th century suggested by the plant pigment records might have been favoured by temperature increases, indicated by pronounced glacier retreats which began during the 10th/11th century. The “Schwaighof” near Gossenkollesee was sold to the Earl of Spaur when winter temperatures declined substantially in the 1670s. Changes in C/N ratio, iron, manganese and mineral magnetics indicated increased detrital input from the catchment, starting approx. 1670 AD. Erosion and detrital input into the lake intensified during cold periods (1688 – 1701 AD and 1820 – 1850 AD), as indicated by a high C/N ratio, metals and mineral magnetics.

[1]  A. Marchetto,et al.  High resolution analysis of fossil pigments, carbon, nitrogen and sulphur in the sediment of eight European Alpine lakes: the MOLAR project , 2000 .

[2]  R. Psenner,et al.  Biogeochemistry of a high mountain lake in the Austrian Alps , 2000 .

[3]  S. Kaushal,et al.  Relationship between C:N ratios of lake sediments, organic matter sources, and historical deforestation in Lake Pleasant, Massachusetts, USA , 1999 .

[4]  P. Leavitt,et al.  Phytobenthos and Phytoplankton as Potential Indicators of Climate Change in Mountain Lakes and Ponds: A HPLC-Based Pigment Approach , 1999, Journal of the North American Benthological Society.

[5]  H. Birks,et al.  D.G. Frey and E.S. Deevey Review 1: Numerical tools in palaeolimnology – Progress, potentialities, and problems , 1998 .

[6]  Peter G. Appleby,et al.  Magnetic properties of recent sediments in Lake Baikal, Siberia , 1998 .

[7]  Willy Tinner,et al.  Vegetation changes and timberline fluctuations in the Central Alps as indicators of holocene climatic oscillations , 1997 .

[8]  Martin Beniston,et al.  CLIMATIC CHANGE AT HIGH ELEVATION SITES: AN OVERVIEW , 1997 .

[9]  Roland Schmidt,et al.  Temperature effects on the acidity of remote alpine lakes , 1997, nature.

[10]  G. Grabherr,et al.  Climate effects on mountain plants , 1994, Nature.

[11]  Donald A. Jackson.  STOPPING RULES IN PRINCIPAL COMPONENTS ANALYSIS: A COMPARISON OF HEURISTICAL AND STATISTICAL APPROACHES' , 1993 .

[12]  A. Marchetto,et al.  Plant pigment ratios from lakes sediments as indicators of recent acidification in alpine lakes , 1992 .

[13]  P. Appleby,et al.  Self-absorption corrections for well-type germanium detectors , 1992 .

[14]  Roland Schmidt,et al.  Climate-driven pH control of remote alpine lakes and effects of acid deposition , 1992, Nature.

[15]  J. Smol,et al.  Paleolimnology and hindcasting climatic trends , 1991 .

[16]  R. M. Clark,et al.  Sequence slotting for stratigraphic correlation between cores: theory and practice , 1989 .

[17]  George H. Dunteman,et al.  Principal Components Analysis , 1990 .

[18]  M. Hill,et al.  Data analysis in community and landscape ecology , 1987 .

[19]  Frank Oldfield,et al.  The calculation of lead-210 dates assuming a constant rate of supply of unsupported 210Pb to the sediment , 1978 .

[20]  J. M. Elliott,et al.  The Energetics of Feeding, Metabolism and Growth of Brown Trout (Salmo trutta L.) in Relation to Body Weight, Water Temperature and Ration Size , 1976 .

[21]  R. Pechlaner.  Salmonideneinsätze in Hochgebirgsseen und -tümpel der Ostalpen: Mit 3 Abbildungen und 1 Tabelle im Text , 1966 .

[22]  J. Dearing,et al.  Quaternary Climates, Environments and Magnetism: Holocene environmental change from magnetic proxies in lake sediments , 1999 .

[23]  H. Diaz.  Climatic change at high elevation sites , 1997 .

[24]  C. Belis,et al.  Palaeolimnological studies of the eutrophication of volcanic Lake Albano (Central Italy) , 1994 .

[25]  Bruno Paldele.  Die aufgelassenen Almen Tirols , 1994 .

[26]  J. A. López del Val,et al.  Principal Components Analysis , 2018, Applied Univariate, Bivariate, and Multivariate Statistics Using Python.

[27]  Peter R. Leavitt,et al.  A review of factors that regulate carotenoid and chlorophyll deposition and fossil pigment abundance , 1993 .

[28]  P. Appleby.  Forward to the lead-210 dating anniversary series , 1993 .

[29]  E. Grimm.  CONISS: a FORTRAN 77 program for stratigraphically constrained cluster analysis by the method of incremental sum of squares , 1987 .

[30]  C. Pfister.  Klimageschichte der Schweiz 1525-1860 , 1985 .

[31]  H. Ettl,et al.  Süsswasserflora von Mitteleuropa , 1985 .

[32]  O. Stolz.  Die Schwaighöfe in Tirol : ein Beitrag zur Siedlungs- und Wirtschaftsgeschichte der Hochalpentäler , 2022 .