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  • 1.
    Andrén, Elinor
    Stockholm University.
    Changes in the composition of the diatom flora during the last century indicate increased eutrophication of the oder estuary, south-western Baltic Sea1999Ingår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 48, s. 665-676Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Four short sediment cores from the Oder estuary, south-western Baltic Sea, were studied with respect to their siliceous microfossil and organic carbon content. The sediments were dated by Pb-210. The objective was to detect and date changes in the composition of the diatom flora and link these changes to increased human impact in the drainage area during recent centuries. Two of the cores showed an unperturbed sedimentary sequence representing a complete historical record. A change in the composition of the diatom assemblages attributable to anthropogenic factors was recorded. This was dated to about 1900 in the Oderhaff. The change consisted of an increase in species that thrive in eutrophic waters and those indicating increased salinity or the availability of inorganic nutrients.

  • 2.
    Andrén, Elinor
    et al.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Telford, Richard J.
    University of Bergen.
    Jonsson, Per
    Stockholm University.
    Reconstructing the history of eutrophication and quantifying total nitrogen reference conditions in Bothnian Sea coastal waters2017Ingår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 198, s. 320-328Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Reference total nitrogen (TN) concentrations for the Gårdsfjärden estuary in the central Bothnian Sea, which receives discharge from an industrial point-source, have been estimated from diatom assemblages using a transfer function. Sedimentological and diatom evidence imply a good ecological status before 1920 with an assemblage dominated by benthic taxa indicating excellent water transparency, high diatom species richness and less organic sedimentation resulting in homogeneous well oxygenated sediments. A change in the diatom assemblage starts between 1920 and 1935 when the species richness declines and the proportion of planktic taxa increases. Increased organic carbon sedimentation after 1920 led to hypoxic bottom waters, and the preservation of laminae in the sediments. The trend in the reconstructed TN-values agrees with the history of the discharge from the mill, reaching maximum impact during the high discharge between 1945 and 1990. The background condition for TN in Gårdsfjärden is 260-300 μg L-1, reconstructed until 1920.

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  • 3.
    Eggertsen, Linda
    et al.
    Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden; Uppsala University, Department of Earth Sciences, Visby, Sweden; Reef Systems Ecology and Conservation Lab, Department of Marine Biology, Fluminense Federal University, Niterói, Brazil.
    Goodell, Whitney
    Fisheries Ecology Research Lab, University of Hawaii, Honolulu, HI, United States; Pristine Seas, National Geographic Society, Washington DC, United States.
    Cordeiro, Cesar A. M. M.
    Reef Systems Ecology and Conservation Lab, Department of Marine Biology, Fluminense Federal University, Niterói, Brazil; Ecology Post Graduation Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
    Cossa, Damboia
    Department of Biological Sciences, Eduardo Mondlane University, Maputo, Mozambique.
    de Lucena, Marcos
    Reef Systems Ecology and Conservation Lab, Department of Marine Biology, Fluminense Federal University, Niterói, Brazil; Ecology Post Graduation Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
    Berkström, Charlotte
    Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden; Department of Aquatic Resources, Institute of Coastal Research, Swedish University of Agricultural Sciences, Öregrund, Sweden.
    Franco, João N.
    MARE - Marine and Environmental Sciences Centre, ESTM, Politécnico de Leiria, Peniche, 2520-620, Portugal; CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Matosinhos, 4450-208, Portugal.
    Ferreira, Carlos E. L.
    Reef Systems Ecology and Conservation Lab, Department of Marine Biology, Fluminense Federal University, Niterói, Brazil.
    Bandeira, Salomão
    Department of Biological Sciences, Eduardo Mondlane University, Maputo, Mozambique.
    Gullström, Martin
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Where the grass is greenest in seagrass seascapes depends on life history and simple species traits of fish2022Ingår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 266, artikel-id 107738Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Tropical seagrass meadows are critical habitats for many fish species, yet few studies have investigated the influence of multiple scale-dependent factors and marine protected areas on seagrass fish species of differing life histories. We assessed the influence of fine-scale seagrass meadow characteristics and seascape-scale variables on the abundance of fish in a seagrass-dominated seascape in the Bazaruto Archipelago, Mozambique, particularly examining patterns of nursery- vs. resident species as well as mobile- vs. sedentary species. We found that fish distribution patterns in this seagrass-dominated seascape were dependent on species’ life history characteristics; nursery taxa showed lower abundance in seagrass meadows further from adult reef habitats, while resident species within seagrass meadows occurred in higher abundances far from reefs. For taxa utilizing both mangroves and seagrass meadows as nursery habitat, proximity to mangroves was an important factor. Fish abundances were generally influenced by variables at the seascape scale (km), while sedentary species were predominantly influenced by area variables, and smaller seascapes (<500 m in radius) better explained distribution patterns. The influence of marine protected areas was taxon-specific, with the strongest effects of protection on resident species. Our results indicate that protection efforts in seagrass-dominated seascapes can have varying impacts on fish distribution, depending on the life history of the species present, and the geographical placement of the reserve within the seascape. Further, we suggest that simple species attributes can be utilised to describe generalized abundance patterns of fish in seagrass seascapes.

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  • 4.
    Larsson, Josefine
    et al.
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Lind, E. E.
    SLU.
    Corell, H.
    Göteborgs universitet.
    Grahn, Mats
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.
    Smolarz, Katarzyna
    University of Gdańsk, Gdynia, Poland.
    Lönn, Mikael
    Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Matematikens didaktik.
    Regional genetic differentiation in the blue mussel from the Baltic Sea area2017Ingår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, s. 98-109Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Connectivity plays an important role in shaping the genetic structure and in evolution of local adaptation. In the marine environment barriers to gene flow are in most cases caused by gradients in environmental factors, ocean circulation and/or larval behavior. Despite the long pelagic larval stages, with high potential for dispersal many marine organisms have been shown to have a fine scale genetic structuring. In this study, by using a combination of high-resolution genetic markers, species hybridization data and biophysical modeling we can present a comprehensive picture of the evolutionary landscape for a keystone species in the Baltic Sea, the blue mussel. We identified distinct genetic differentiation between the West Coast, Baltic Proper and Bothnian Sea regions, with lower gene diversity in the Bothnian Sea. Oceanographic connectivity together with salinity and to some extent species identity provides explanations for the genetic differentiation between the West Coast and the Baltic Sea (Baltic Proper and Bothnian Sea). The genetic differentiation between the Baltic Proper and Bothnian Sea cannot be directly explained by oceanographic connectivity, species identity or salinity, while the lower connectivity to the Bothnian Sea may explain the lower gene diversity. © 2016.

  • 5.
    Sjöling, Sara
    et al.
    Södertörns högskola, Institutionen för kemi, biologi, geografi och miljövetenskap.
    Mohammed, S M
    Lyimo, T J
    Kyaruzi, J J
    Benthic bacterial diversity and nutrient processes in mangroves: impact of deforestation2005Ingår i: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 63, nr 3, s. 397-406Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The bacterial diversity and nutrient dynamics of mangrove sediments in Kisakasaka, Tanzania, was investigated in order to evaluate potential changes associated with deforestation of mangroves. Study sites included relatively undisturbed, recently protected mangroves and clear-cut mangrove areas that were sampled during both the wet and dry seasons. Physicochemical parameters, nitrogenase activity, pore water nutrient concentrations and bacterial diversity were measured in sediment depth profiles using both molecular and chemical techniques. Results show that there are significant differences in sediment pore water nutrient concentrations and bacterial diversity in sediments of mangrove areas which have been deforested compared to those which have been protected. Average measured values for protected and deforested areas, respectively, were: sulphide (S-2-),S- < 42 +/- 10 mu M and > 1.9 +/- 0.5 mM at 30 cm depth; ammonium (NH4+), 58 +/- 2 mu M and 113 +/- 12 mu M at 4-5 cm depth; soluble reactive phosphate, 40.2 +/- 11 mu M and 18.4 +/- 1.2 at 4-5 cm depth. Nitrogen fixation rates were lower in deforested areas during day and night, organic content was higher in protected areas (20 +/- 5%) compared to deforested areas (12 +/- 3%). The bacterial diversity was lower in deforested areas as determined by Shannon index using 16S rRNA gene analysis with terminal restriction fragment length polymorphism.

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