scholarly journals Impact of Aurelia aurita medusae (Cnidaria, Scyphozoa) on the standing stock and community composition of mesozooplankton in the Kiel Bight (western Baltic Sea)

1995 ◽  
Vol 127 ◽  
pp. 39-45 ◽  
Author(s):  
G Behrends ◽  
G Schneider
Keyword(s):  
Baltic Sea ◽  
Community Composition ◽  
Standing Stock ◽  
Aurelia Aurita ◽  
Kiel Bight

100-years-changes in the phytoplankton community of Kiel Bight (Baltic Sea)

2008 ◽  
Vol 73 (3-4) ◽  
pp. 300-322 ◽  
Author(s):  
Norbert Wasmund ◽  
Jeanette Göbel ◽  
Bodo v. Bodungen
Keyword(s):  
Baltic Sea ◽  
Phytoplankton Community ◽  
Kiel Bight

scholarly journals Key role of phosphorus and nitrogen in regulating cyanobacterial community composition in the northern Baltic Sea

2015 ◽  
Vol 164 ◽  
pp. 161-171 ◽  
Author(s):  
Agneta Andersson ◽  
Helena Höglander ◽  
Chatarina Karlsson ◽  
Siv Huseby
Keyword(s):  
Baltic Sea ◽  
Community Composition ◽  
Cyanobacterial Community

scholarly journals Bacteria in sea ice and underlying brackish water at 54°26'5"N (Baltic Sea, Kiel Bight)

1997 ◽  
Vol 158 ◽  
pp. 23-40 ◽  
Author(s):  
T Mock ◽  
KM Meiners ◽  
HC Giesenhagen
Keyword(s):  
Sea Ice ◽  
Baltic Sea ◽  
Brackish Water ◽  
Kiel Bight

Enrichment of heavy metals in Baltic Sea sediments (Kiel Bight) - Early diagenesis and anthropogenic influence

1996 ◽  
Vol 147 (1) ◽  
pp. 137-144
Author(s):  
Kirsten Meiwirth ◽  
Lüder Kruse ◽  
Susanne Wachtendorf ◽  
Melanie Wienberg ◽  
Matthias Zabel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Baltic Sea ◽  
Early Diagenesis ◽  
Anthropogenic Influence ◽  
Kiel Bight

scholarly journals Salinity as a key control on the diazotrophic community composition in the Baltic Sea

2021 ◽  
Author(s):  
Christian Furbo Reeder ◽  
Ina Stoltenberg ◽  
Jamileh Javidpour ◽  
Carolin Regina Löscher
Keyword(s):  
Baltic Sea ◽  
Community Composition ◽  
N2 Fixation ◽  
Statistical Testing ◽  
Functional Marker ◽  
The Baltic Sea ◽  
Heterocystous Cyanobacteria ◽  
The Baltic ◽  
The Impact ◽  
Diazotrophic Community

Abstract. Over the next decade, the Baltic Sea is predicted to undergo severe changes including a decrease in salinity due to altering precipitation. This will likely impact the distribution and community composition of Baltic Sea N2 fixing microbes, of which especially heterocystous cyanobacteria are adapted to low salinities and may expand to waters with currently higher salinity, including the Danish Strait and Kattegat, while other high-salinity adapted N2 fixers might decrease in abundance. In order to explore the impact of salinity on the distribution and activity of different diazotrophic clades, we followed the natural salinity gradient from the Eastern Gotland and Bornholm Basins through the Arkona Basin to the Kiel Bight and combined N2 fixation rate measurements with a molecular analysis of the diazotrophic community using the key functional marker gene for N2 fixation nifH, as well as the key functional marker genes anf and vnf, encoding for the two alternative nitrogenases. We detected N2 fixation rates between 0.7 and 6 nmol N L-1 d-1, and the diazotrophic community was dominated by the cyanobacterium Nodularia and the small unicellular, cosmopolitan cyanobacterium UCYN-A. Nodularia was present in abundances between 8.07 x 105 and 1.6 x 107 copies L-1 in waters with salinities of 10 and below, while UCYN-A reached abundances of up to 4.5 x 107 copies L-1 in waters with salinity above 10. Besides those two cyanobacterial diazotrophs, we found several clades of proteobacterial N2 fixers and alternative nitrogenase genes associated with Rhodopseudomonas palustris, a purple non-sulfur bacterium. Based on statistical testing, salinity was identified as the primary parameter describing the diazotrophic distribution, while pH and temperature did not have a similarly significant influence on the diazotrophic distribution. While this statistical analysis will need to be explored in direct experiments, it gives an indication for a future development of diazotrophy in a freshening Baltic Sea with UCYN-A retracting to more saline North Sea waters and heterocystous cyanobacteria expanding as salinity decreases.

Impact of the Słupia River waters on microbial communities in the port of Ustka and adjacent Baltic Sea waters

2018 ◽  
Vol 47 (4) ◽  
pp. 429-438
Author(s):  
Krzysztof Rychert ◽  
Magdalena Wielgat-Rychert ◽  
Łukasz Lemańczyk
Keyword(s):  
Surface Layer ◽  
Baltic Sea ◽  
Community Composition ◽  
River Mouth ◽  
Water Masses ◽  
Ciliate Community ◽  
Ciliate Abundance ◽  
Significant Difference ◽  
Saline Waters ◽  
Bottom Zone

Abstract The distribution of bacterial and ciliate abundance, ciliate community composition and other parameters were studied during summer along a transect from the mouth of the Słupia River to offshore waters (southern Baltic Sea). Bacteria were examined under an epifluorescence microscope and ciliates were observed under an inverted microscope. Two water masses were identified along the transect. Less saline waters in the river mouth and in the surface layer in the port of Ustka were characterized by high bacterial abundance (5.51–6.16 × 106 ml−1) and low ciliate abundance (0.34–0.90 cells ml−1). More saline waters in the near-bottom zone in the port of Ustka and in the surface layer outside the port contained smaller numbers of bacteria (0.99–2.14 × 106 ml−1) and larger numbers of ciliates (2.65–5.40 cells ml−1). The differences were statistically significant. The separation of the two water masses indicated that the Słupia River exerted a minor impact on the marine waters. The ciliate community composition changed along the transect studied. The main statistically significant difference observed was the low contribution of oligotrichs and choreotrichs to ciliate biomass (3–4%) in less saline waters and their dominance (45–80% of ciliate biomass) in more saline waters.

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