Projected future climate change and Baltic Sea ecosystem management

Andersson, Agneta; Meier, H. E. Markus; Ripszám, Mátyás; Rowe, Owen; Wikner, Johan; Haglund, Peter; Eilola, Kari; Legrand, Catherine; Figueroa, Daniela; Paczkowska, Joanna; Lindehoff, Elin; Tysklind, Mats; Elmgren, Ragnar

doi:10.1007/s13280-015-0654-8

Cited by 154 publications

(154 citation statements)

References 56 publications

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“…The consequences of climate change are therefore expected to vary regionally (Rönnberg and Bonsdorff, 2004). The north receives large inputs of riverine DOM rich in humic substances (Andersson et al, 2015), while the south receives a comparatively nutrient rich riverine DOM inflow (Stepanauskas et al, 2002). The riverine loadings differ significantly in C:N:P stoichiometry depending on region and can potentially have very different effects on the recipient ecosystem.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Increased Loads of Dissolved Organic Matter on Estuarine Microbial Community Composition and Function

et al. 2017

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Increased river loads are projected as one of the major consequences of climate change in the northern hemisphere, leading to elevated inputs of riverine dissolved organic matter (DOM) and inorganic nutrients to coastal ecosystems. The objective of this study was to investigate the effects of elevated DOM on a coastal pelagic food web from the coastal northern Baltic Sea, in a 32-day mesocosm experiment. In particular, the study addresses the response of bacterioplankton to differences in character and composition of supplied DOM. The supplied DOM differed in stoichiometry and quality and had pronounced effects on the recipient bacterioplankton, driving compositional changes in response to DOM type. The shifts in bacterioplankton community composition were especially driven by the proliferation of Bacteroidetes, Gemmatimonadetes, Planctomycetes, and Alpha- and Betaproteobacteria populations. The DOM additions stimulated protease activity and a release of inorganic nutrients, suggesting that DOM was actively processed. However, no difference between DOM types was detected in these functions despite different community compositions. Extensive release of re-mineralized carbon, nitrogen and phosphorus was associated with the bacterial processing, corresponding to 25–85% of the supplied DOM. The DOM additions had a negative effect on phytoplankton with decreased Chl a and biomass, particularly during the first half of the experiment. However, the accumulating nutrients likely stimulated phytoplankton biomass which was observed to increase towards the end of the experiment. This suggests that the nutrient access partially outweighed the negative effect of increased light attenuation by accumulating DOM. Taken together, our experimental data suggest that parts of the future elevated riverine DOM supply to the Baltic Sea will be efficiently mineralized by microbes. This will have consequences for bacterioplankton and phytoplankton community composition and function, and significantly affect nutrient biogeochemistry.

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Section: Introductionmentioning

confidence: 99%

The Effect of Increased Loads of Dissolved Organic Matter on Estuarine Microbial Community Composition and Function

et al. 2017

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“…Climate-related pressures include melting sea ice, decreased snow cover and permafrost thawing and increased discharges of organic matter, which may lead to altered trophic relationships (e.g. Andersson et al 2015). Even in a scenario wherere CO2 levels have been stabilised at 450 PPM, dramatic consequences can still be expected in the Nordic region (Fig.…”

Section: Box 9: Competition For Space In the Most Densely Populated Nmentioning

confidence: 99%

Biodiversity and ecosystem services in Nordic coastal ecosystems

Belgrano¹,

Clausen²,

Ejdung³

et al. 2018

TemaNord

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“…Instead, freshening of the water has likely brought about an increase of its biomass in the Bothnian Sea and the Bothnian Bay since 1990 [16]. Projections for the future development of the Baltic Sea suggest a further decline of salinity [17,18], which may cause species that originate from a high-salinity environment to disappear and freshwater and glacial relict species, such as L. macrurus, to increase in numbers [18]. However, with consequent rising temperatures, the propagation of L. macrurus requires that the population is able to reproduce and grow in its distributional areas.…”

Section: Open Accessmentioning

confidence: 99%

Fatty acid composition and lipid content in the copepod Limnocalanus macrurus during summer in the southern Bothnian Sea

et al. 2017

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The lipid reserves and occurrence of the cold-stenothermic, omnivorous copepod Limnocalanus macrurus were studied in the Bothnian Sea (northern Baltic Sea) during spring and summer 2013-2014 with a special emphasis on the fatty acid composition of adults and their potential food. The individual total wax ester (WE) content, determined from the size of oil sacs in the prosoma, ranged on average from 1.3 to 2.6 µg, and showed a decreasing trend towards September. Lipids were dominated by fatty acids 16:0, 18:1(n-9), 18:2(n-6), 20:5(n-3) and 22:6(n-6), forming 56-61% of total fatty acids in June-September. Decreasing abundance of adults and reduction of the lipid storage implied that during summer adults suffered from starvation and, as a result, became eliminated from the population. The lipid content and dietary fatty acid markers suggested that in May, adult L. macrurus utilized the phytoplankton bloom, consisting mainly of diatoms and dinoflagellates, but later, during July-September, consumed either algae or heterotrophic organisms sinking from upper water layers or crustaceans inhabiting the same deeper water layers as L. macrurus. In the face of the climate change, the rising temperatures may force L. macrurus permanently to deeper water levels. If also the food resources are limited, we conclude that the summer season may act as a bottleneck limiting the propagation of L. macrurus and having implications further along the food web.

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Projected future climate change and Baltic Sea ecosystem management

Cited by 154 publications

References 56 publications

The Effect of Increased Loads of Dissolved Organic Matter on Estuarine Microbial Community Composition and Function

The Effect of Increased Loads of Dissolved Organic Matter on Estuarine Microbial Community Composition and Function

Biodiversity and ecosystem services in Nordic coastal ecosystems

Fatty acid composition and lipid content in the copepod Limnocalanus macrurus during summer in the southern Bothnian Sea

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