Phosphorus dynamics during the transition from nitrogen to phosphate limitation in the central Baltic Sea

Nausch, Monika; Nausch, Günther; Wasmund, Norbert

doi:10.3354/meps266015

Cited by 73 publications

(43 citation statements)

References 52 publications

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“…Earlier studies suggested that Baltic primary production is mostly limited by nitrogen availability, but the activity of nitrogen-fixing cyanobacteria in the summer period may cause limitation by phosphorus (Kivi et al 1993, Nausch et al 2004. Knowledge of Baltic bacterioplankton dynamics pattern is fragmentary.…”

Section: Bacteria Containing Bacteriochlorophyll a (Bchl A)mentioning

confidence: 99%

“…et al 2002, Wasmund & Uhlig 2003. By the end of the fall season, the water column becomes homogenous down to the halocline, with mean water temperatures of 3 to 4°C.Earlier studies suggested that Baltic primary production is mostly limited by nitrogen availability, but the activity of nitrogen-fixing cyanobacteria in the summer period may cause limitation by phosphorus (Kivi et al 1993, Nausch et al 2004. Knowledge of Baltic bacterioplankton dynamics pattern is fragmentary.…”

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confidence: 99%

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Seasonal changes and diversity of aerobic anoxygenic phototrophs in the Baltic Sea

Mašı́n¹,

Zdun²,

Stoń-Egiert³

et al. 2006

Aquat. Microb. Ecol.

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The community of aerobic anoxygenic phototrophs was investigated in the Baltic Sea using infrared epifluorescence microscopy from September 2004 to October 2005. The majority of these bacteriochlorophyll-containing organisms exhibited a specific sickle-shaped morphology, with rods or other morphotypes observed only occasionally. Aerobic anoxygenic phototrophs were observed mostly from April to September (1 to 12% of total prokaryotes), peaking in May 2005 at a concentration of up to 0.38 × 10 6 cells ml -1. This peak was associated with the later phase of the spring bloom. In the later months, the amount of phototrophic bacteria gradually declined until the beginning of the fall mixing, and remained low from November to March, contributing only 0 to 2% of total prokaryotes. A novel technique combining fluorescent in situ hybridization (FISH) and infrared epifluorescence microscopy indicated that the Baltic aerobic anoxygenic phototrophs were mostly Gammaproteobacteria, with a smaller fraction of Alphaproteobacteria. KEY WORDS: Aerobic photosynthetic bacteria · Bacteriochlorophyll a · Photoheterotrophy · Epifluorescence microscopy Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 45: [247][248][249][250][251][252][253][254] 2006 thermocline structure gradually dissolves due to the decrease in irradiance and intensified wind mixing. The autumn bloom (September-October) is dominated by cyanobacteria along with dinophytes and chlorophytes as other main contributors (Sto? et al. 2002, Wasmund & Uhlig 2003. By the end of the fall season, the water column becomes homogenous down to the halocline, with mean water temperatures of 3 to 4°C.Earlier studies suggested that Baltic primary production is mostly limited by nitrogen availability, but the activity of nitrogen-fixing cyanobacteria in the summer period may cause limitation by phosphorus (Kivi et al. 1993, Nausch et al. 2004. Knowledge of Baltic bacterioplankton dynamics pattern is fragmentary. In the coastal zone offshore of Sweden, bacterial cell numbers display a relatively simple pattern, with a minimum in winter and a maximum in summer (Hagström et al. 1979). In early spring, the bacterial community is predominantly controlled by nitrogen availability and nanoflagellate grazing (Kuupo et al. 1998). In some studies, a stimulation of bacterial growth by phosphorus was observed in late spring, whereas in summer a great stimulation was induced by the combined addition of nitrogen and phosphorus (Kivi et al. 1993).In a previous study, we surveyed the presence of AAPs in the Baltic Sea in late summer (August -September) 2003 by IR kinetic fluorometry; at that time, Bchl a concentration varied between 8 and 50 ng l -1 . Interestingly, during our next survey in April 2004, the activity of AAPs was below the detection limit of the instrument (~2 ng Bchl a l -1 ; M. Koblí=ek unpubl. data). This result suggested that the community of AAPs in the Baltic Sea undergoes seasonal changes. For this reason, we followed ...

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Section: Bacteria Containing Bacteriochlorophyll a (Bchl A)mentioning

confidence: 99%

mentioning

confidence: 99%

Seasonal changes and diversity of aerobic anoxygenic phototrophs in the Baltic Sea

Mašı́n¹,

Zdun²,

Stoń-Egiert³

et al. 2006

Aquat. Microb. Ecol.

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“…The extent to which different nutrient sources sustain phytoplankton growth after the winter nutrients are depleted is under debate, but in the central Baltic Sea, first DIN (April) and then DIP (May to July) are depleted to the detection limit of the analytical methods (Nausch 1998;Nausch et al 2004;Raateoja et al 2011). Mineralisation of particulate organic P in the euphotic zone may in part cover the nutrient requirements of phytoplankton in early summer (Nausch and Nausch 2007).…”

Section: Carbon Inputsmentioning

confidence: 99%

“…However, under P limitation, the C:P and N:P ratios in Baltic plankton may exceed the Redfield ratio of C:N:P = 106:16:1 (e.g. Engel et al 2002;Nausch et al 2004;Kangro et al 2007;Larsson 2007, 2010). However, lower C:P ratios are also observed in cases where a PO 4 excess with regard to the Redfield N:P ratio exists in the nutrient pool (Wasmund et al 1998).…”

Section: Carbon Inputsmentioning

confidence: 99%

Environmental Impacts—Marine Biogeochemistry

Schneider

Eilola

Lukkari

et al. 2015

Regional Climate Studies

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Marine biogeochemistry deals with the budgets and transformations of biogeochemically reactive elements such as carbon, nitrogen and phosphorus. Inorganic nitrogen and phosphorus compounds are the major nutrients and control organic matter (biomass) production in the surface water. Due to various anthropogenic activities, the input of these nutrients into the Baltic Sea has increased drastically during the last century and has enhanced the net organic matter production by a factor of 2-4 (eutrophication). This has led to detrimental oxygen depletion and hydrogen sulphide production in the deep basins of the Baltic Sea. Model simulations based on the Baltic Sea Action Plan (BSAP) indicate that current eutrophication and thus extension of oxygen-depleted areas cannot be reversed within the next hundred years by the proposed nutrient reduction measures. Another environmental problem is related to decreasing pH (acidification) that is caused by dissolution of the rising atmospheric CO 2 . Estimates indicate a decrease in pH by about 0.15 during the last 1-2 centuries, and continuation of this trend may have serious ecological consequences. However, the concurrent increase in the alkalinity of the Baltic Sea may have significantly counteracted acidification.

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“…CML 2001 does not discriminate between terrestrial, marine and freshwater eutrophication, so these values represent the Rolff and Elfwing (2015) Mainly N Mainly N P Vahtera et al (2007) N a n d P Nausch et al (2004) N a n d P Kangro et al (2007) N a n d P Tamminen and Andersen (2007) Mainly N N and P Mainly P Andersson et al (1996) N and P P Reports Bernes ( The limiting nutrients listed reflect our interpretation of the literature content, with blank spaces indicating that the limiting nutrient in that particular subbasin could not be interpreted from the literature. For the sources describing international agreements, the limiting nutrient is regarded as that for which reduction targets are set, i.e.…”

Section: Comparison With Currently Available Characterisation Factorsmentioning

confidence: 99%

Spatially differentiated midpoint indicator for marine eutrophication of waterborne emissions in Sweden

Henryson

Hansson

Sundberg

2017

Int J Life Cycle Assess

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Purpose In life cycle assessment (LCA), eutrophication is commonly assessed using site-generic characterisation factors, despite being a site-dependent environmental impact. The purpose of this study was to improve the environmental relevance of marine eutrophication impact assessment in LCA, particularly regarding the impact assessment of waterborne nutrient emissions from Swedish agriculture. Methods Characterisation factors were derived using sitedependent data on nutrient transport for all agricultural soils in Sweden, divided into 968 catchment areas, and considering the Baltic Sea, the receiving marine compartment, as both nitrogen-and phosphorus-limited. These new characterisation factors were then applied to waterborne nutrient emissions from typical grass ley and spring barley cultivation in all catchments.Results and discussion The site-dependent marine eutrophication characterisation factors obtained for nutrient leaching from soils varied between 0.056 and 0.986 kg N eq /kg N and between 0 and 7.23 kg N eq /kg P among sites in Sweden. On applying the new characterisation factors to spring barley and grass ley cultivation at different sites in Sweden, the total marine eutrophication impact from waterborne nutrient emissions for these crops varied by up to two orders of magnitude between sites. This variation shows that site plays an important role in determining the actual impact of an emission, which means that site-dependent impact assessment could provide valuable information to life cycle assessments and increase the relevance of LCA as a tool for assessment of product-related eutrophication impacts. Conclusions Characterisation factors for marine eutrophication impact assessment at high spatial resolution, considering both the site-dependent fate of eutrophying compounds and specific nutrient limitations in the recipient waterbody, were developed for waterborne nutrient emissions from agriculture in Sweden. Application of the characterisation factors revealed variations in calculated impacts between sites in Sweden, highlighting the importance of spatial differentiation of characterisation modelling within the scale of the impact.

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Phosphorus dynamics during the transition from nitrogen to phosphate limitation in the central Baltic Sea

Cited by 73 publications

References 52 publications

Seasonal changes and diversity of aerobic anoxygenic phototrophs in the Baltic Sea

Seasonal changes and diversity of aerobic anoxygenic phototrophs in the Baltic Sea

Environmental Impacts—Marine Biogeochemistry

Spatially differentiated midpoint indicator for marine eutrophication of waterborne emissions in Sweden

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