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Late Quaternary ecological turnover in high arctic Lake Einstaken, Nordaustlandet, Svalbard (80° N)

Concepts and implications of environmental change and human impact : studies from Austrian geomorphological research

Auteur(s) et Affiliation(s)

LUOTO, T.P.
Inst. for Limnology, Austrian Academy of Sciences, Mondsee, Autriche
Dep. of Geosciences and Geography, Univ., Helsinki, Finlande
Inst. for Limnology, Austrian Academy of Sciences, Mondsee, Autriche
Environmental Research and Protection, City Environment Centre, Helsinki, Finlande
KUBISCHTA, F.
Dep. of Geosciences and Geography, Univ., Helsinki, Finlande
KULTTI, S.
Dep. of Geosciences and Geography, Univ., Helsinki, Finlande
KNUDSEN, K.L.
Dep. of Earth Sciences, Univ., Aarhus, Danemark
SALONEN, V.-P.
Dep. of Geosciences and Geography, Univ., Helsinki, Finlande
KEILER, M.
Inst. of Geography, Univ., Bern, Suisse
Dep. of Geography and Regional Science, Univ., Graz, Autriche
Inst. of Remote Sensing and Photogrammetry, Univ. of Technology, Graz, Autriche
OTTO, J.-C.
Dep. of Geography and Geology, Univ., Salzburg, Autriche


Description :
Multiproxy palaeolimnological analyses of a sediment core record from Lake Einstaken, Nordaustlandet, give insight into long-term ecological and environmental dynamics in the High Arctic Svalbard during the last c. 13 000 cal yr bp. The foraminiferal assemblages reflected high-arctic, shallow-water conditions in an area of changing salinity conditions. The cladoceran assemblages experienced 2 complete faunal turnovers in the early part of the lacustrine sediment sequence, most likely related to inlake processes. The chironomid assemblages went through 5 distinct Holocene faunal changes that were probably mostly related to climate development and changes in nutrient conditions. The freshwater diatoms revealed 4 distinct episodes of change in their assemblages that could be related to their sensitivity to pH and nutrient status. The most distinct common feature in the Holocene faunal and floral assemblages was the pioneer phase during the early Holocene. The recent environmental changes are possibly related to a coupled effect of elevated nutrient conditions and increased temperatures.


Type de document :
Article de monographie

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2012, vol. 94, n°. 1, p. 337-354, nombre de pages : 18, Références bibliographiques : 3 p.

Date :
2012

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi

Langue :
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)