Coupling the Sub-Systems — the Baltic Sea as a Case Study

Jansson, Bengt; Wilmot, W.L.; Wulff, Fredrik

doi:10.1007/978-1-4757-0387-0_21

Cited by 14 publications

(6 citation statements)

References 21 publications

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“…Nitrogen has also been suggested as the main limiting nutrient for primary production in the Baltic by, for example, Jansson et al (1984) and Granitli et al (1988Granitli et al ( , 1990. In our study area, the spring bloom and late summer production were limited by nitrogen only, while the early summer period showed limitation by both N-and P. In early autumn, ambient inorganic nutrient concentrations had started to increase again, and nutrient additions did not cause significant stimulations of phytoplankton growth, indicating light or temperature limitation, or both.…”

Section: Discussionmentioning

confidence: 99%

Nutrient limitation and grazing control of the Baltic plankton community during annual succession

Kivi¹,

Kaitala²,

Kuosa³

et al. 1993

Limnology & Oceanography

152

104

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Nutrient limitationand grazing control of the planktonic community were studied in the northern Baltic Sea off the SW coast of Finland during the phytoplankton growth season of 1985. In situ experiments based on a 23 factorial design were performed in mesocosm enclosures on 10 occasions. The manipulations used included phosphorus (PO,? ) and nitrogen (NH,+ ) additions and the removal of metazooplankton by 1 OO+m prefiltration.In each experiment, the responses of phytoplankton, bacterioplankton, heterotrophic nanoflagellates, and protozooplankton were followed for 2 d. Orthogonal multiple regression analysis was used to reveal which manipulations had statistically significant effects. Nitrogen was found to be the basic limiting nutrient for phytoplankton throughout the productive season. During early summer, only the combined addition of P and N evoked a clear increase in the growth of phytoplankton.In general, bacterial productivity was not highly affected by the manipulations. In summer the removal of metazooplankton caused a rapid increase in the amount of protozooplankton in the units with loo-pm prefiltration or prefiltration combined with N addition. In the absence of metazooplankton, the nutrient-induced increase in primary productivity was channeled to protozooplankton, whose growth in the units where metazooplankton was present was severely limited by food competition or by direct metazooplankton grazing.

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Section: Discussionmentioning

confidence: 99%

Nutrient limitation and grazing control of the Baltic plankton community during annual succession

Kivi¹,

Kaitala²,

Kuosa³

et al. 1993

Limnology & Oceanography

152

104

View full text Add to dashboard Cite

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“…the Kiel Bight (Smetacek et a1.1984), the Asko-Landsort (Hobro 1979, Larsson & Hagstrom 1982, Jansson et al 1984, and the Tvarminne areas (Niemi 1975, Forsskahl et al 1982, Kuparinen et a1.1984, Huttunen & Kuparinen 1986, Kononen & Niemi 1986). The last area borders with that under study in this paper.…”

Section: Discussionmentioning

confidence: 99%

“…1982, Jansson et al 1984, Leppkinen 1988. Another characteristic feature of t h e Baltic ecosystem is t h e late-summer bloom of t h e nitrogenfixing blue-green algae (e.g.…”

Section: Discussionmentioning

confidence: 99%

Annual cycle of particle size fractions and phytoplankton biomass in the northern Baltic proper

Kahru¹,

Kaasik²,

Leeben³

1991

Mar. Ecol. Prog. Ser.

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“…The vernal growth period holds a key position in determining the response of the Baltic Sea ecosystem to the observed increase in winter nutrient levels (Jansson et al 1984). The structure and functioning of the pelagic food web during that phase determine how much nutrient from the initial reserves is transported out of the pelagic system by sedimentation, and how much is retained for recycling in the upper water layer.…”

Section: Discussionmentioning

confidence: 99%

Spatio-temporal mosaic of the phytoplankton spring bloom in the open Baltic Sea in 1986

Kahru¹,

Leppänen²,

Nõmmann³

et al. 1990

Mar. Ecol. Prog. Ser.

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The spatio-temporal variability of the phytoplankton spring bloom in the open Baltic Sea during an international joint study (PEX'86) is described in relation to the physical and chemical environment. Simultaneous participation of 14 research vessels enabled highly synoptic sampling of the study area of 20 X 40 n mile. Onset of the bloom was controlled by mesoscale hydrodynamic features -a pair of cyclonic and anticyclonic eddies; water masses with different salinities. The eddies supported an exceptionally high amount of chlorophyll (> 700 mg m-' in the cyclonic eddy). The temporal development of the bloom was different in each of the mesoscale features. Chlorophyll levels in the eddies started to decrease due to se&mentation before formation of the thermocline and the depletion of inorganic nutrients. Variability of the chlorophyll distribution was highest just before the peak in the spatially averaged concentrahon was attained.

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Coupling the Sub-Systems — the Baltic Sea as a Case Study

Cited by 14 publications

References 21 publications

Nutrient limitation and grazing control of the Baltic plankton community during annual succession

Nutrient limitation and grazing control of the Baltic plankton community during annual succession

Annual cycle of particle size fractions and phytoplankton biomass in the northern Baltic proper

Spatio-temporal mosaic of the phytoplankton spring bloom in the open Baltic Sea in 1986

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