scholarly journals Transfer of diazotrophic nitrogen to mesozooplankton in Kiel Fjord, Western Baltic Sea: a mesocosm study

2006 ◽  
Vol 324 ◽  
pp. 105-112 ◽  
Author(s):  
F Sommer ◽  
T Hansen ◽  
U Sommer
Keyword(s):  
Baltic Sea ◽  
Kiel Fjord

scholarly journals Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea

eEarth ◽  
2008 ◽  
Vol 3 (1) ◽  
pp. 37-49 ◽  
Author(s):  
A. Nikulina ◽  
I. Polovodova ◽  
J. Schönfeld
Keyword(s):  
Baltic Sea ◽  
Environmental Changes ◽  
Kiel Fjord

scholarly journals Microplastic abundance in beach sediments of the Kiel Fjord, Western Baltic Sea

2021 ◽  
Author(s):  
Kevin Schröder ◽  
Elke Kossel ◽  
Mark Lenz
Keyword(s):  
Baltic Sea ◽  
Chloride Solution ◽  
Calcium Chloride Solution ◽  
Plastic Debris ◽  
Kiel Fjord ◽  
The Third ◽  
Sewage Plant ◽  
Close Proximity ◽  
Beach Sediments ◽  
Beach Use

AbstractWe assessed the abundance of microplastics (0.2–5 mm) in drift line sediments from three sites in Kiel Fjord, Western Baltic Sea. The first site is intensively used by beach visitors, the second is in close proximity to a sewage plant and the third is polluted with large-sized plastic litter. Samples were split into three grain size classes (0.2–0.5, 0.5–1, 1–5 mm), washed with calcium chloride solution, and filtered at 0.2 mm. Filters were then visually inspected, and a total of 180 fragments was classified as microplastics, of which 39% were analyzed using Raman spectroscopy. At the site that is close to a sewage plant as well as at the site with intense beach use, 1.8 and 4.5 particles (fibers plus fragments) per kg of dry sediment were found, respectively, while particle abundances reached 30.2 per kg of dry sediment at the site with high litter loads. Our data suggest that the fragmentation of large plastic debris at site seems to be a relevant source for microplastics in Western Baltic Sea beach sediments.

Effects of heavy metals (Pb, Cu, Zn) on algal food uptake by Elphidium excavatum (Foraminifera) 

2021 ◽  
Author(s):  
Michael Lintner ◽  
Bianca Lintner ◽  
Wolfgang Wanek ◽  
Nina Keul ◽  
Frank von der Kammer ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Matter ◽  
Baltic Sea ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
The Baltic Sea ◽  
Kiel Fjord ◽  
Food Uptake ◽  
The Baltic

<p><span><span>Foraminifera are unicellular organisms which are important for marine C and N processing. Feeding experiments showed that the food uptake and thus the turnover of organic matter are influenced by changes of physical parameters (e.g., temperature, salinity). Since many areas of the Baltic Sea are strongly affected by anthropogenic activity and therefore contaminated by heavy metals from shipping in the past, this study examined the effect of heavy metal pollution on the food uptake of the most common foraminiferal species of the Baltic Sea, </span></span><span><span><em>E</em></span></span><span><span><em>lphidium</em></span></span><span><span><em> excavatum</em></span></span><span><span>. </span></span><span><span>In 2019, we collected water and sediment containing living </span></span><span><span><em>E</em></span></span><span><span><em>.</em></span></span><span><span><em> excavatum</em></span></span><span><span> in </span></span><span><span>the Kiel Fjord</span></span><span><span>. In laboratory experiments,</span></span><span><span> Baltic Sea seawater was enriched with metals at various levels above normal seawater: Zn (9.2-, 144- and 1044-fold), Pb (2.4-, 48.5- and 557-fold) and Cu (5.6- and 24.3-fold), and the </span></span><span><span>foraminiferal </span></span><span><span>uptake of </span></span><span><sup><span>13</span></sup></span><span><span>C- and </span></span><span><sup><span>15</span></sup></span><span><span>N-labelled phytodetritus was measured by isotope ratio mass spectrometry. Significant differences in food uptake were observable at different types and levels of heavy metals in sea water. An increase in the Pb concentration did not affect food uptake, whereas strong negative effects were found for high levels of Zn and especially for Cu. Interestingly, experiments with short incubation periods (1 and 5 days) showed greater differences in food uptake </span></span><span><span>from undisturbed conditions </span></span><span><span>than those of longer incubation times (10 and 15 days). In summary, an increase in the heavy metal pollution in the Kiel Fjord will likely lead to a significant reduction in the turnover of organic matter by foraminifera such as </span></span><span><span><em>E. excavatum</em></span></span><span><span>.</span></span></p>

scholarly journals Environmental response of living benthic foraminifera in Kiel Fjord, SW Baltic Sea

2007 ◽  
Vol 2 (4) ◽  
pp. 191-217 ◽  
Author(s):  
A. Nikulina ◽  
I. Polovodova ◽  
J. Schönfeld
Keyword(s):  
Baltic Sea ◽  
Benthic Foraminifera ◽  
Environmental Response ◽  
Kiel Fjord
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