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Regulation of bacterial production in the Råne estuary, northern Baltic Sea
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2015 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Reglering av bakterieproduktion i Råneälvens mynningsområde, Bottenviken (Swedish)
Abstract [en]

Earlier studies indicate that the interaction between heterotrophic bacteria and dissolved organic matter is rather different in rivers and estuaries. The aim of my thesis was to elucidate if bacteria are regulated differently in the Råne river and estuary during a spring situation. Surface water was collected at both locations and a bioassay performed to study limiting substances for bacterial production, proportion bio-available dissolved organic carbon (DOC) in the water and bacterial growth efficiencies (BGE). The Carbon, Nitrogen and Phosperous concentrations were all higher in the estuary than in the river. The bioassay showed that nitrogen-phosphorus limited the bacterial production at both locations, while DOC occurred in excess. The bio-available part of the DOC pool was larger in the estuary (~6%) than in the river (~3%). However, the BGE was much higher in the river (~40%) than in the estuary (~5%), indicating that a larger proportion of the consumed DOC was used for respiration in the estuary. I conclude that heterotrophic bacteria are limited by the same substance, but that the bacterial metabolism is quite differently regulated in the river and in the estuary.

Place, publisher, year, edition, pages
2015. , 24 p.
Keyword [en]
Bacteria, Estuary, Nutrient limitation, bDOC, BGE
National Category
URN: urn:nbn:se:umu:diva-108240OAI: diva2:851664
Educational program
Bachelor of Science in Biology and Earthscience
Available from: 2015-09-14 Created: 2015-09-07 Last updated: 2015-09-14Bibliographically approved

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Broman, Evelina
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Department of Ecology and Environmental Sciences

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