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Climate-induced ecological change in subarctic lakes - Evidence from biological archives, long-term monitoring, and contemporary field studies

Nilsson, Jenny (2022). Climate-induced ecological change in subarctic lakes - Evidence from biological archives, long-term monitoring, and contemporary field studies. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-969-8
eISBN 978-91-7760-970-4
[Doctoral thesis]

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Abstract

Northern lakes have a unique flora and fauna and are sensitive ecosystems that experience rapid rates of change. Multiple environmental changes are currently affecting these lakes, including climate-induced oligotrophication, with nutrient levels decreasing in waters throughout the Scandinavian mountain range. In this thesis I have studied multiple lakes and used approaches that span over multiple time scales to study energy flows and community composition of primary producers and consumers in northern lake food webs, and how these respond to climate-induced environmental changes. Paleolimnological analyses showed that northern lake food webs have been closely connected to long-term climate fluctuations, and catchment vegetation during the last 5800 years. And further, that benthic primary production was the predominating carbon source to zooplankton biomass during warmer and drier conditions while pelagic primary production predominated during colder and wetter periods. Time-series analysis of contemporary data showed clear evidence of the current oligotrophication in all of the lakes with dramatic decreases in water concentrations of total phosphorus. Food web responses were, however, weaker than expected likely owing to a large dependence on benthic primary productivity in these systems. The results from a study on within- and among-lake variability in δ13C and δ15N, for primary producers and consumers, showed that within- and among-lake stable isotope variability were similar. Which indicates that small-scale, within-lake processes, can be equally important as catchment-scale processes for stable isotope composition of primary producers and consumers.

Authors/Creators:Nilsson, Jenny
Title:Climate-induced ecological change in subarctic lakes - Evidence from biological archives, long-term monitoring, and contemporary field studies
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:47
Number of Pages:81
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-969-8
ISBN for electronic version:978-91-7760-970-4
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:trophic interactions, subarctic, habitat, paleolimnology, spatial variability
URN:NBN:urn:nbn:se:slu:epsilon-p-118402
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118402
ID Code:28493
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:19 Aug 2022 07:25
Metadata Last Modified:19 Aug 2022 07:54

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