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Bakteriell produktion i humösa istäckta sjöar i norra Sverige
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The main purposes of this study were to 1) quantify bacterial production in winter during ice conditions, and 2) to compare these production measures with values measured from summer and open water conditions in three humic lakes situated in northern Sweden. Another purpose of this study was to 3) examine whether clear-cutting significantly affected bacterial production or water chemistry in two lakes situated in catchments were a large part of the forest had been removed through logging compared to an undisturbed reference lake. In winter (March/April 2014), the bacterial production ranged from 0, 7 - 2, 2 µgC/L/day and in the summer of 2013 the production values was 4 – 10 times higher. The main reason for lower bacterial production in winter was ascribed to lower water temperatures as well as to older and more recalcitrant DOC, as there were no significant differences in total dissolved nitrogen or DOC concentration or -quality, that could explain a lower production compared to summer. It was not possible to detect any effects of the clear-cutting using the approach of only comparing between the lakes situated in clear-cut watersheds, with an undisturbed reference lake.

Place, publisher, year, edition, pages
2014. , 22 p.
Keyword [sv]
Bakteriell produktion, DOC, ytvatten, limnologi
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:umu:diva-89646OAI: diva2:722568
Subject / course
Examensarbete i Naturgeografi för kandidatexamen
Educational program
Bachelor of Science in Biology and Earthscience
Available from: 2014-06-12 Created: 2014-06-09 Last updated: 2014-06-12Bibliographically approved

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