Negligible effect of hypolimnetic oxygenation on the trophic state of Lake Jyväsjärvi, Finland
Kuha, J., Palomäki, A. H., Keskinen, T., & Karjalainen, J. (2016). Negligible effect of hypolimnetic oxygenation on the trophic state of Lake Jyväsjärvi, Finland. Limnologica, 58, 1-6. doi:10.1016/j.limno.2016.02.001
© 2016 Elsevier GmbH. This is a final draft version of an article whose final and definitive form has been published by Elsevier. Published in this repository with the kind permission of the publisher.
Hypolimnetic oxygenation by pumping oxygen-rich surface water to the hypolimnion (HLO) is a commonly used tool for the restoration of nutrient-loaded dimictic lakes. However, in recent years its effectiveness has been questioned. In this case study we evaluated monitoring data covering a period of 23-years to show that, although experimental cessation of HLO drastically changed the lake's temperature and dissolved oxygen regimes, it did not significantly affect its trophic status. Thus, we recommend that the limited financial resources available are better directed towards further lowering the lake's external phosphorus load than continuing HLO.