Benthic foraminifera distribution in the modern sediments of the Southeastern Baltic Sea with respect to North Sea water inflows

2018 ◽  
Vol 18 (6) ◽  
pp. 1-7 ◽  
Author(s):  
E. P. Ponomarenko ◽  
V. A. Krechik
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Benthic Foraminifera ◽  
Sea Water

scholarly journals Distribution of N<sub>2</sub>O in the Baltic Sea during transition from anoxic to oxic conditions

2006 ◽  
Vol 3 (4) ◽  
pp. 557-570 ◽  
Author(s):  
S. Walter ◽  
U. Breitenbach ◽  
H. W. Bange ◽  
G. Nausch ◽  
D. W. R. Wallace
Keyword(s):  
Nitrous Oxide ◽  
Baltic Sea ◽  
North Sea ◽  
Sea Water ◽  
Water Inflow ◽  
The Baltic Sea ◽  
The Baltic ◽  
Stagnation Period

Abstract. In January 2003, a major inflow of cold and oxygen-rich North Sea Water terminated an ongoing stagnation period in parts of the central Baltic Sea. In order to investigate the role of North Sea Water inflow in the production of nitrous oxide (N2O), we measured dissolved and atmospheric N

scholarly journals Nitrous oxide water column distribution during the transition from anoxic to oxic conditions in the Baltic Sea

2006 ◽  
Vol 3 (3) ◽  
pp. 729-764 ◽  
Author(s):  
S. Walter ◽  
U. Breitenbach ◽  
H. W. Bange ◽  
G. Nausch ◽  
D. W. R. Wallace
Keyword(s):  
Nitrous Oxide ◽  
Baltic Sea ◽  
Water Column ◽  
North Sea ◽  
Deep Water ◽  
Sea Water ◽  
The Baltic Sea ◽  
Gotland Basin ◽  
Water Renewal ◽  
The Baltic

Abstract. In January 2003, a major inflow of cold and oxygen-rich North Sea Water in the Baltic Sea terminated an ongoing stagnation period in parts of the central Baltic Sea. In order to investigate the role of North Sea Water inflow to the Baltic Sea with regard to the production of nitrous oxide (N2O), we measured dissolved and atmospheric N2O at 26 stations in the southern and central Baltic Sea in October 2003. At the time of our cruise, water renewal had proceeded to the eastern Gotland Basin, whereas the western Gotland Basin was still unaffected by the inflow. The deep water renewal was detectable in the distributions of temperature, salinity, and oxygen concentrations as well as in the distribution of the N2O concentrations: Shallow stations in the Kiel Bight and Pomeranian Bight were well-ventilated with uniform N2O concentrations near equilibrium throughout the water column. In contrast, stations in the deep basins, such as the Bornholm and the Gotland Deep, showed a clear stratification with deep water affected by North Sea Water. Inflowing North Sea Water led to changed environmental conditions, especially enhanced oxygen (O2) or declining hydrogen sulfide (H2S) concentrations, thus, affecting the conditions for the production of N2O. Pattern of N2O profiles and correlations with parameters like oxygen and nitrate differed between the basins. The dominant production pathway seems to be nitrification rather than denitrification. No indications for advection of N2O by North Sea Water were found. A rough budget revealed a significant surplus of in situ produced N2O after the inflow. However, due to the permanent halocline, it can be assumed that the formed N2O does not reach the atmosphere. Hydrographic aspects therefore are decisive factors determining the final release of produced N2O to the atmosphere.

Aerobic Methanotrophy in North Sea Sediment and Baltic Sea Water Column as Revealed by Bacteriohopanepolyol Lipids and Genomic Approaches

2019 ◽  
Author(s):  
D. Rush ◽  
L. Villanueva ◽  
M.T.J. van der Meer ◽  
E.C. Hopmans ◽  
J.S. Sinninghe Damsté
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
North Sea ◽  
Sea Water

THE ABUNDANCE OF RECENT FORAMINIFERA IN SURFACE SEDIMENT OF AMBON BAY

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Suhartati M. Natsir
Keyword(s):  
Surface Sediment ◽  
Benthic Foraminifera ◽  
Sea Water ◽  
Planktonic Foraminifera ◽  
Sediment Characteristic ◽  
Abundance And Distribution

Foraminifera are generally live in sea water with various sizes. These organisms consist of planktonic and benthic foraminifera. Geological activity on plutonic and volcanic with vomiting magma is transpiring on, and then affects sedimentation and foraminiferal abundance of Ambon Bay. The study was determined to study the abundance and distribution of foraminifera based on the sediment characteristic of Ambon Bay. Sample collected in 2007 of Ambon Bay showed that only 29 samples of 50 samples containing foraminifera. The collected sediments have 86 species of foraminifera, consisting 61 species of benthic foraminifera and 25 species of planktonic foraminifera. The dominant benthic foraminifera in the surface sediment of Ambon bay were Amphistegina lessonii, Ammoniabeccarii,Elphidium craticulatum,Operculina ammonoides and Quinqueloculina parkery. The planktonic foraminifera that were frequently collected from the bay were Globorotalia tumida, Globoquadrina pseudofoliata, Globigerinoides pseudofoliata, Globigerinoides cyclostomus dan Pulleniatina finalis. Generally, the species dwelled as abundant on substrate sand, whereas the areas within substrate mud have no foraminifera lie on them. Keywords: Foraminifera, Abundance, Sediment, Ambon Bay

scholarly journals DNA Markers Reveal Genetic Associations among 11,000-Year-Old Scots Pine (Pinus sylvestris L.) Found in the Baltic Sea with the Present-Day Gene Pools in Lithuania

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 317
Author(s):  
Darius Danusevičius ◽  
Jurata Buchovska ◽  
Vladas Žulkus ◽  
Linas Daugnora ◽  
Algirdas Girininkas
Keyword(s):  
Baltic Sea ◽  
Scots Pine ◽  
Sea Water ◽  
Pcr Amplification ◽  
Balkan Peninsula ◽  
Gene Pools ◽  
Genetic Associations ◽  
The Baltic Sea ◽  
Assignment Probability ◽  
The Baltic

We aimed to extract DNA and amplify PCR fragments at the mitochondrial DNA Nad7.1 locus and 11 nuclear microsatellite loci in nine circa 11,000-year-old individuals of Scots pine found at the bottom of the Baltic sea and test the genetic associations with the present-day gene pool of Scots pine in Lithuania. We followed a strict anticontamination protocol in the lab and, simultaneously with the aDNA specimens, tested DNA-free controls. The DNA was extracted by an ATMAB protocol from the ancient wood specimens sampled underwater from Scots pine stumps located circa 20–30 m deep and circa 12 km ashore in western Lithuania. As the references, we used 30 present-day Lithuanian populations of Scots pine with 25–50 individuals each. The aDNA yield was 11–41 ng/μL. The PCR amplification for the mtDNA Nad7.1 locus and the nDNA loci yielded reliable aDNA fragments for three and seven out of nine ancient pines, respectively. The electrophoresis profiles of all the PCR tested DNA-free controls contained the sizing standard only, indicating low likelihood for contamination. At the mtDNA Nad7.1 locus, all three ancient Scots pine individuals had the type A (300 bp) allele, indicating postglacial migration from the refugia in Balkan peninsula. The GENECLASS Bayesian assignment tests revealed relatively stringer and consistent genetic associations between the ancient Scots pine trees and the present-day southern Lithuanian populations (assignment probability 0.37–0.55) and several wetlands in Lithuania. Our study shows that salty sea water efficiently preserves ancient DNA in wood at the quality levels suitable for genetic testing of trees dated back as far as 11,000 years before present.

Modeling Transit Flow Through Port Gates and Connecting Channel in Baltic Sea—Liepaja Port—Liepaja Lake System

2021 ◽  
Vol 8 ◽  
Author(s):  
Vilnis Frishfelds ◽  
Juris Sennikovs ◽  
Uldis Bethers ◽  
Jens Murawski ◽  
Andrejs Timuhins
Keyword(s):  
Baltic Sea ◽  
Sea Level ◽  
Sea Water ◽  
Lake System ◽  
The North ◽  
Transit Flow ◽  
Trade Channel ◽  
Calm Weather ◽  
Set Up ◽  
The Baltic

This study investigates a water transport features by extending Copernicus Marine Environment Service (CMEMS) to the Liepaja coast-port-channel-lake system with a two-way nested model. The Liepaja lake and Liepaja port are connected by Trade channel. The Liepaja port has three gates—the openings in wave breakers connecting the port aquatory with the Baltic sea. Each of gates has a corresponding dredged channel for securing the navigation. A hydrodynamic model is set up to study the flow and water level in this system. The area of the port gates, port and Trade channel are resolved by 33 m grid. The model results are verified against currents and sea level observations inside/outside port, Trade channel and Liepaja lake. Results and observations show that strong currents occur in the Trade channel in case of rapid sea level change in Baltic sea despite the Trade channel is rather shallow at the connection with Liepaja lake. The northern part of the Liepaja lake gets filled with brackish water during storm surge events. The channel has notable alternating current also during a relatively calm weather due to the port seiches. Long and narrow shape of the channel implies the Helmholtz type oscillations between the lake and the port with a period in approximately semidiurnal range. Hydrodynamic simulations describe well these oscillations but the phase of hourly scale oscillations in the port may differ in case of weak external forcing. Water exchange is significantly increased by the transit (gate to gate) sea currents. This transit flow usually occurs between South or Central gate and the North gate carrying sea water into the port. Northward flow of the surface layer is more characteristic in the port aquatory due the prevailing south-western winds. There are intense morphological processes at the coastline and underwater slope near the Liepaja port due to a sandy western coastline of Latvia, long fetch of the waves and strong currents at the port gates. Liepaja port is one of the Latvian ports in HywasPort operational service of hydrodynamics, waves and siltation.

scholarly journals Bacterial communities potentially involved in iron-cycling in Baltic Sea and North Sea sediments revealed by pyrosequencing

2016 ◽  
Vol 92 (4) ◽  
pp. fiw054 ◽  
Author(s):  
Carolina Reyes ◽  
Olaf Dellwig ◽  
Kirstin Dähnke ◽  
Matthias Gehre ◽  
Beatriz E. Noriega-Ortega ◽  
...  
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Bacterial Communities ◽  
Iron Cycling
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