Effects of oligotrophication on primary production in peri-alpine lakes

Finger, David Christian; Wüest, Alfred; Bossard, Peter (2013). Effects of oligotrophication on primary production in peri-alpine lakes. Water resources research, 49(8), pp. 4700-4710. American Geophysical Union 10.1002/wrcr.20355

Finger et al. WRR49.pdf - Published Version
Available under License Publisher holds Copyright.

Download (3MB) | Preview

During the second half of the 20th century untreated sewage released from housing and industry into natural waters led to a degradation of many freshwater lakes and reservoirs worldwide. In order to mitigate eutrophication, wastewater treatment plants, including Fe-induced phosphorus precipitation, were implemented throughout the industrialized world, leading to reoligotrophication in many freshwater lakes. To understand and assess the effects of reoligotrophication on primary productivity, we analyzed 28 years of 14C assimilation rates, as well as other biotic and abiotic parameters, such as global radiation, nutrient concentrations and plankton densities in peri-alpine Lake Lucerne, Switzerland. Using a simple productivity-light relationship, we estimated continuous primary production and discussed the relation between productivity and observed limnological parameters. Furthermore, we assessed the uncertainty of our modeling approach based on monthly 14C assimilation measurements using Monte Carlo simulations. Results confirm that monthly sampling of productivity is sufficient for identifying long-term trends in productivity and that conservation management has successfully improved water quality during the past three decades via reducing nutrients and primary production in the lake. However, even though nutrient concentrations have remained constant in recent years, annual primary production varies significantly from year to year. Despite the fact that nutrient concentrations have decreased by more than an order of magnitude, primary production has decreased only slightly. These results suggest that primary production correlates well to nutrients availability but meteorological conditions lead to interannual variability regardless of the trophic status of the lake. Accordingly, in oligotrophic freshwaters meteorological forcing may reduce productivity impacting on the entire food chain of the ecosystem.

Item Type:

Journal Article (Original Article)


08 Faculty of Science > Institute of Geography > Physical Geography > Unit Hydrology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography

UniBE Contributor:

Finger, David Christian


900 History > 910 Geography & travel




American Geophysical Union




Monika Wälti-Stampfli

Date Deposited:

13 Dec 2013 15:01

Last Modified:

10 Sep 2017 14:19

Publisher DOI:


Uncontrolled Keywords:

oligotrophication; nutrients lake ecology; primary production; carbon assimilation





Actions (login required)

Edit item Edit item
Provide Feedback