Stable isotopes and digital elevation models to study nutrient inputs in high-arctic lakes

Five major factors control nutrient and organic matter inputs in high-Arctic lakes, all potentially affected by climate change: ice cover; run-off from the watershed; aquatic and terrestrial primary productivity; guano deposition from birds. Quantifying these controls is a key first step to understa...

Full description

Bibliographic Details
Published in:Rendiconti Lincei
Main Authors: CALIZZA, EDOARDO, COSTANTINI, Maria Letizia, ROSSI, David, PASQUALI, Vittorio, CAREDDU, GIULIO, ROSSI, Loreto
Other Authors: Calizza, Edoardo, Costantini, Maria Letizia, Rossi, David, Pasquali, Vittorio, Careddu, Giulio, Rossi, Loreto
Format: Article in Journal/Newspaper
Language:English
Published: Springer-Verlag Italia s.r.l. 2016
Subjects:
nitrogen
carbon sediment
biogeochemical cycle
climate change
hydro-ecology
svalbard
Arctic
Guano
Kolhamna
Storvatnet
Svalbard
Climate change
Spitsbergen
Online Access:http://hdl.handle.net/11573/898469
https://doi.org/10.1007/s12210-016-0515-9
http://www.springerlink.com/content/120941/
Description
Summary:Five major factors control nutrient and organic matter inputs in high-Arctic lakes, all potentially affected by climate change: ice cover; run-off from the watershed; aquatic and terrestrial primary productivity; guano deposition from birds. Quantifying these controls is a key first step to understand what combination of factors underlies the biological productivity in Arctic lakes and drives their ecological response to climate change. Based on C and N elemental content and stable isotope analysis in sediments belonging to three lakes in North Spitsbergen (Svalbard), Digital Elevation Models and drainage maps, we propose an integrated approach for the analysis of nutrient and organic matter inputs in lakes and the role of catchment hydro-geomorphology in determining inter-lake differences in the isotopic composition of sediments. Given its high run-off and large catchment, organic deposits in Tvillingvatnet were dominated by terrestrial inputs, whereas inputs were mainly of aquatic origin in Storvatnet, a lowland lake characterised by low potential run-off. In Kolhamna, organic deposits seemed to be dominated by inputs from birds. Isotopic signatures were similar between samples within each lake, representing precise tracers for studies on the effect of climate change on biogeochemical cycles in lakes. The presented approach proved to be an effective research pathway for the identification of factors underlying nutrient and organic matter inputs within each water body, as well as for the modelling of expected changes in nutrient content associated with changes in isotopic composition of sediments.

Similar Items