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Primary production and phytoplankton composition in relation to DOC input and bacterioplankton production in humic Lake Örträsket
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2002 (English)In: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 47, no 1, 41-52 p.Article in journal (Refereed) Published
Abstract [en]

1. The biomass and production of picophytoplankton, large phytoplankton and heterotrophic bacterioplankton were measured in humic Lake Örträsket, northern Sweden during four consecutive summers. 2. High flow episodes, carrying fresh dissolved organic carbon (DOC) into the lake, always stimulated heterotrophic bacterial production at the expense of primary production. Primary production never exceeded bacterial production for approximately 20 days after such an episode had replenished epilimnial DOC. We suggest that allochthonous DOC is an energy source that stimulates bacterioplankton that, because of their efficient uptake of inorganic nutrients, are then able to outcompete phytoplankton. After the exhaustion of readily available DOC, phytoplankton were able to dominate epilimnion production in Lake Örträsket. 3. Biomass production was higher when dominated by phytoplankton than by bacterioplankton, despite a similar utilization of nutrients in the epilimnion throughout the summer. We propose that different C : N : P ratios of bacterioplankton and phytoplankton permit the latter to produce more carbon (C) biomass per unit of available inorganic nutrients than bacterioplankton.

Place, publisher, year, edition, pages
2002. Vol. 47, no 1, 41-52 p.
Keyword [en]
bacterioplankton, humic lake, phytoplankton, picophytoplankton, production
URN: urn:nbn:se:umu:diva-37608DOI: 10.1046/j.1365-2427.2002.00779.xISI: 000173397900004OAI: diva2:369390
Available from: 2010-11-10 Created: 2010-11-10 Last updated: 2010-11-11Bibliographically approved

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Bergström, Ann-KristinJansson, Mats
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Department of Ecology and Environmental Sciences
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