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  • 1.
    Andersson, A.
    et al.
    Umeå University;Umeå Marine Science Centre.
    Brugel, S.
    Umeå University;Umeå Marine Science Centre.
    Paczkowska, J.
    Umeå University;Umeå Marine Science Centre.
    Rowe, O. F.
    Umeå University;Umeå Marine Science Centre;Univ Helsinki, Finland.
    Figueroa, D.
    Umeå University;Umeå Marine Science Centre.
    Kratzer, S.
    Stockholm University.
    Legrand, Catherine
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Influence of allochthonous dissolved organic matter on pelagic basal production in a northerly estuary2018In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 204, p. 225-235Article in journal (Refereed)
    Abstract [en]

    Phytoplankton and heterotrophic bacteria are key groups at the base of aquatic food webs. In estuaries receiving riverine water with a high content of coloured allochthonous dissolved organic matter (ADOM), phytoplankton primary production may be reduced, while bacterial production is favoured. We tested this hypothesis by performing a field study in a northerly estuary receiving nutrient-poor, ADOM-rich riverine water, and analyzing results using multivariate statistics. Throughout the productive season, and especially during the spring river flush, the production and growth rate of heterotrophic bacteria were stimulated by the riverine inflow of dissolved organic carbon (DOC). In contrast, primary production and photosynthetic efficiency (i.e. phytoplankton growth rate) were negatively affected by DOC. Primary production related positively to phosphorus, which is the limiting nutrient in the area. In the upper estuary where DOC concentrations were the highest, the heterotrophic bacterial production constituted almost 100% of the basal production (sum of primary and bacterial production) during spring, while during summer the primary and bacterial production were approximately equal. Our study shows that riverine DOC had a strong negative influence on coastal phytoplankton production, likely due to light attenuation. On the other hand DOC showed a positive influence on bacterial production since it represents a supplementary food source. Thus, in boreal regions where climate change will cause increased river inflow to coastal waters, the balance between phytoplankton and bacterial production is likely to be changed, favouring bacteria. The pelagic food web structure and overall productivity will in turn be altered. (C) 2018 The Authors. Published by Elsevier Ltd.

  • 2. Eklund, B.
    et al.
    Svensson, A. P.
    Jonsson, C.
    Malm, T.
    Toxic effects of decomposing red algae on littoral organisms2005In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 62, no 4, p. 621-626Article in journal (Refereed)
    Abstract [en]

    Large masses of filamentous red algae of the genera Polysiphonia, Rhodomela, and Ceramium are regularly washed up on beaches of the central Baltic Sea. As the algal masses start to decay, red coloured effluents leak into the water, and this tinge may be traced several hundred meters off shore. In this study, possible toxic effects of these effluents were tested on littoral organisms from different trophic levels. Effects on fertilisation, germination and juvenile survival of the brown seaweed Fucus vesiculosus were investigated, and mortality tests were performed on the crustaceans Artemia salina and Idotea baltica, as well as on larvae and adults of the fish Pomatoschistus microps. Fucus vesiculosus was the most sensitive species of the tested organisms to the red algal extract. The survival of F. vesiculosus recruits was reduced with 50% (LC50) when exposed to a concentration corresponding to 1.7 g l(-1) dw red algae. The lethal concentration for L baltica, A. salina and P. microps were approximately ten times higher. The toxicity to A. salina was reduced if the algal extract was left to decompose during two weeks but the decline in toxicity was not affected by different light or temperature conditions. This study indicates that the filamentous red algae in the central Baltic Sea may produce and release compounds with negative effects on the littoral ecosystem. The effects may be particularly serious for the key species F. vesiculosus, which reproduce in autumn when filamentous red algal blooms are most severe. (C) 2004 Elsevier Ltd. All rights reserved.

  • 3.
    Granéli, Edna
    Plankton Ecology Research Group, Department of Marine Ecology, P.O. Box 124, S-221 00, Lund, Sweden.
    Nutrient limitation of phytoplankton biomass in a brackish water bay highly influenced by river discharge1987In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 25, no 5, p. 555-565Article in journal (Refereed)
    Abstract [en]

    Laboratory nutrient enrichment experiments (n=30) with the indigenous phytoplankton community from the brackish (mean salinity 16‰) Laholm Bay, south-east Kattegat, were performed during the period August 1981 to August 1983. The results show that nitrogen is the most limiting nutrient for potential phytoplankton biomass formation, despite a high input of inorganic nitrogen to the bay from rivers draining heavily fertilized agricultural areas. Phosphorus, silica, trace metal or chelator (EDTA) additions to Laholm Bay phytoplankton had no significant effect on biomass yield. 

  • 4.
    Martínez-García, Sandra
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Univ Vigo, Dept Ecol & Biol Anim, Vigo 36310, Spain.
    Arbones, B.
    CSIC, IIM, Vigo 36208, Spain.
    Garcia-Martin, E. E.
    Univ Vigo, Dept Ecol & Biol Anim, Vigo 36310, Spain ; Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England.
    Teixeira, I. G.
    CSIC, IIM, Vigo 36208, Spain.
    Serret, P.
    Univ Vigo, Dept Ecol & Biol Anim, Vigo 36310, Spain.
    Fernandez, E.
    Univ Vigo, Dept Ecol & Biol Anim, Vigo 36310, Spain.
    Figueiras, F. G.
    CSIC, IIM, Vigo 36208, Spain.
    Teira, E.
    Univ Vigo, Dept Ecol & Biol Anim, Vigo 36310, Spain.
    Alvarez-Salgado, X. A.
    CSIC, IIM, Vigo 36208, Spain.
    Impact of atmospheric deposition on the metabolism of coastal microbial communities2015In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 153, p. 18-28Article in journal (Refereed)
    Abstract [en]

    The impact of rain water collected at marine, urban and rural sites on coastal phytoplankton biomass, primary production and community composition as well as the effect on microbial plankton metabolism was studied in 3 microcosm experiments conducted under contrasting spring, autumn and winter conditions. The measured responses were highly variable. Rainwater additions increased chlorophyll a (Chl a) concentration (5-68% difference between rainwater treatments relative to the control) in all experiments and reduced or stimulated primary production (PP) depending on the treatment and the experiment (from -10 to +169% relative to the control). Autotrophic stimulation was highest in spring, probably related to the low initial natural nutrient concentrations. Under winter nutrient replete conditions, rainwater inputs changed the phytoplankton community although this change did not promote increases in primary production. Enhancement of net autotrophy (increase of net oxygen production up to 227%) after rainwater inputs were only found during the period of low nutrient availability. Inputs of dissolved organic nitrogen (DON) explained a large fraction of the variability in the response of PP, Chl a, community respiration (CR) and net community production (NCP). Our results suggest that differences in the initial environmental conditions (i.e. nutrient availability), rainwater composition and the ability of the present autotropic communities to utilize the new nutrients result in substantial changes in the microbial responses and associated biologically-mediated carbon fluxes. As atmospheric nutrient inputs into coastal oceans are increasing rapidly, our results help to understand the effects of different inputs on the metabolism of distinct microbial communities. (C) 2014 Elsevier Ltd. All rights reserved.

  • 5. Nedwell, D.
    et al.
    Hall, S.E.
    Andersson, A.
    Hagström, Åke
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Seasonal changes in the distribution and exchange of inorganic nitrogen between sediment and water in the Northern Baltic (Gulf of Bothnia)1983In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 17, no 2, p. 169-179Article in journal (Refereed)
  • 6. Nordmyr, Linda
    et al.
    Åström, Mats
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Peltola, Pasi
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Metal pollution of estuarine sediments caused by leaching of acid sulphate soils2008In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 76, no 1, p. 141-152Article in journal (Refereed)
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