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Succession and growth limitation of phytoplankton in the Gulf of Bothnia (Baltic Sea)
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (UMFpub)
Inst. f. Systemekologi, Stockholms universitet.
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (Agneta Andersson)
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1996 (English)In: Marine Biology, ISSN 0025-3162, E-ISSN 1432-1793, Vol. 126, no 4, 791-801 p.Article in journal (Refereed) Published
Abstract [en]

A one year field study of four stations in the Gulf of Bothnia during 1991 showed that the biomass was ca. two times, and primary productivity ca, four times, lower in the north (Bothnian Bay) than in the south (Bothnian Sea) during the summer. Nutrient addition experiments indicated phosphorus limitation of phytoplankton in the Bothnian Bay and the coastal areas in the northern Bothnian Sea, but nitrogen limitation in the open Bothnian Sea. A positive correlation between the phosphate concentration and the production/biomass ratio of phytoplankton was demonstrated, which partly explained the differences in the specific growth rate of the phytoplankton during the summer. Differences in photosynthetic active radiation between the stations also showed a covariation with the primary productivity. The relative importance of nutrient or light limitation for photosynthetic carbon fixation could not, however, be conclusively determined from this study. Marked differences in phytoplankton species composition from north to south were also observed. The number of dominating species was higher in the Bothnian Sea than in the Bothnian Bay. The distribution of some species could be explained as due to nutrient availability (e.g. Nodularia spumigena, Aphanizomenon sp.), while salinity probably limits the distribution of some limnic as well as marine species. The potentially toxic phytoplankton N. spumigena, Dinophysis acuminata and Chrysochromulina spp. were common in the Bothnian Sea but not in the Bothnian Bay. The pico- and nanoplankton biomass during late summer was higher than previously reported due to a revised carbon/volume ratio.

Place, publisher, year, edition, pages
1996. Vol. 126, no 4, 791-801 p.
National Category
Ecology
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URN: urn:nbn:se:umu:diva-52551DOI: 10.1007/BF00351346ISI: A1996VR10300024OAI: oai:DiVA.org:umu-52551DiVA: diva2:506360
Available from: 2012-02-28 Created: 2012-02-24 Last updated: 2017-10-24

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