scholarly journals Seaweed resources of the Baltic Sea, Kattegat and German and Danish North Sea coasts

2020 ◽  
Vol 63 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Florian Weinberger ◽  
Tiina Paalme ◽  
Sofia A. Wikström
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Saccharina Latissima ◽  
Seaweed Cultivation ◽  
The Baltic Sea ◽  
Low Salinity ◽  
Ecological Problems ◽  
Low Diversity ◽  
The Baltic ◽  
Hard Substrata

AbstractDue to low salinity and lack of hard substrata, the Baltic Sea and Kattegat area and German and Danish North Sea coasts are characterized by a relatively low diversity of seaweeds. At the same time the areas are severely eutrophicated, which has caused extensive shifts in macroalgal communities toward opportunistic species. Unattached seaweed communities dominated by Furcellaria lumbricalis, which have been a resource for hydrocolloid production since the 1940s, have been severely reduced due to eutrophication and unsustainable harvesting and are nowadays only exploited commercially in Estonia. On the other hand, the biomass of opportunistic seaweeds of various red, green and brown algal genera has increased. They cause ecological problems, are a nuisance on many tourist beaches and constitute at the same time a potential bioresource that is so far only exploited to a limited extent for production of energy and fertilizer. Commercial seaweed cultivation is largely focused on Saccharina latissima and still very limited, but is currently being expanded as a compensation measure for sea-based fish aquaculture. Also land-based seaweed cultivation is primarily employed for recycling of nutrients in tank animal aquaculture, but in most cases so far only on an experimental scale.

scholarly journals Model calculations of the effects of present and future emissions of air pollutants from shipping in the Baltic Sea and the North Sea

2014 ◽  
Vol 14 (15) ◽  
pp. 21943-21974 ◽  
Author(s):  
J. E. Jonson ◽  
J. P. Jalkanen ◽  
L. Johansson ◽  
M. Gauss ◽  
H. A. C. Denier van der Gon
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Years Of Life Lost ◽  
Ship Emissions ◽  
The Baltic Sea ◽  
Model Calculations ◽  
The North ◽  
Before And After ◽  
The North Sea ◽  
The Baltic

Abstract. Land-based emissions of air pollutants in Europe have steadily decreased over the past two decades, and this decrease is expected to continue. Within the same time span emissions from shipping have increased, although recently sulphur emissions, and subsequently particle emissions, have decreased in EU ports and in the Baltic Sea and the North Sea, defined as SECAs (Sulphur Emission Control Areas). The maximum allowed sulphur content in marine fuels in EU ports is now 0.1%, as required by the European Union sulphur directive. In the SECAs the maximum fuel content of sulphur is currently 1% (the global average is about 2.4%). This will be reduced to 0.1% from 2015, following the new IMO rules (International Maritime Organisation). In order to assess the effects of ship emissions in and around the Baltic Sea and the North Sea, regional model calculations with the EMEP air pollution model have been made on a 1/4° longitude × 1/8° latitude resolution, using ship emissions in the Baltic Sea and the North Sea that are based on accurate ship positioning data. The effects on depositions and air pollution and the resulting number of years of life lost (YOLL) have been calculated by comparing model calculations with and without ship emissions in the two sea areas. The calculations have been made with emissions representative of 2009 and 2011, i.e. before and after the implementation of stricter controls on sulphur emissions from mid 2010. The calculations with present emissions show that per person, an additional 0.1–0.2 years of life lost is estimated in areas close to the major ship tracks with present emission levels. Comparisons of model calculations with emissions before and after the implementation of stricter emission control on sulphur show a general decrease in calculated particle concentration. At the same time, however, an increase in ship activity has resulted in higher emissions and subsequently air concentrations, in particular of NOx, especially in and around several major ports. Additional model calculations have been made with land based and ship emissions representative of year 2030. Following a decrease in emissions, air quality is expected to improve, and depositions to be reduced. Particles from shipping are expected to decrease as a result of emission controls in the SECAs. Further controls of NOx emissions from shipping are not decided, and calculations are presented with and without such controls.

Phenology of Migratory Bat Activity Across the Baltic Sea and the South-Eastern North Sea

2014 ◽  
Vol 16 (1) ◽  
pp. 139-147 ◽  
Author(s):  
Jens Rydell ◽  
Lothar Bach ◽  
Petra Bach ◽  
Laura Guia Diaz ◽  
Joanna Furmankiewicz ◽  
...  
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
The South ◽  
The Baltic Sea ◽  
Bat Activity ◽  
South Eastern ◽  
The Baltic

scholarly journals Geographic variation in fitness‐related traits of the bladderwrack Fucus vesiculosus along the Baltic Sea‐North Sea salinity gradient

2019 ◽  
Vol 9 (16) ◽  
pp. 9225-9238 ◽  
Author(s):  
Francisco R. Barboza ◽  
Jonne Kotta ◽  
Florian Weinberger ◽  
Veijo Jormalainen ◽  
Patrik Kraufvelin ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Geographic Variation ◽  
North Sea ◽  
Salinity Gradient ◽  
Fucus Vesiculosus ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Understanding resource driven female–female competition: ovary and liver size in sand gobies

2019 ◽  
Vol 6 (9) ◽  
pp. 190886 ◽  
Author(s):  
Aurora García-Berro ◽  
Johanna Yliportimo ◽  
Kai Lindström ◽  
Charlotta Kvarnemo
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Nest Site ◽  
Operational Sex Ratio ◽  
Female Competition ◽  
The Baltic Sea ◽  
Nest Sites ◽  
The North ◽  
The North Sea ◽  
The Baltic

The operational sex ratio (OSR, ready-to-mate males to females) is a key factor determining mating competition. A shortage of a resource essential for reproduction of one sex can affect OSR and lead to competition within the opposite sex for resource-holding mates. In the sand goby ( Pomatoschistus minutus ), a fish with paternal care, male readiness to mate depends on acquiring a nest-site, whereas food abundance primarily impacts female egg production. Comparing body condition and gonadal investment of fish from two populations with different availability in resources (Baltic Sea: few nest-sites, more food; North Sea: many nest-sites, less food), we predicted females carrying more mature eggs in the Baltic Sea than in the North Sea. As predicted, ovaries were larger in Baltic Sea females, and so was the liver (storage of energy reserves and vitellogenic compounds) for both sexes, but particularly for females. More females were judged (based on roundness scores) to be ready to spawn in the Baltic Sea. Together with a nest colonization experiment confirming a previously documented difference between the two areas in nest-site availability, these results indicate a more female-biased OSR in the Baltic Sea population, compared to the North Sea, and generates a prediction that female–female competition for mating opportunities is stronger in the Baltic population. To our knowledge, this is the first time that female reproductive investment is discussed in relation to OSR using field data.

Iodine-129, Iodine-127 and Cesium-137 in seawater from the North Sea and the Baltic Sea

2016 ◽  
Vol 162-163 ◽  
pp. 289-299 ◽  
Author(s):  
A. Daraoui ◽  
L. Tosch ◽  
M. Gorny ◽  
R. Michel ◽  
I. Goroncy ◽  
...  
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
The Baltic Sea ◽  
The North ◽  
Cesium 137 ◽  
The North Sea ◽  
The Baltic

scholarly journals Ship emissions of SO<sub>2</sub> and NO<sub>2</sub>: DOAS measurements from airborne platforms

2012 ◽  
Vol 5 (5) ◽  
pp. 1085-1098 ◽  
Author(s):  
N. Berg ◽  
J. Mellqvist ◽  
J.-P. Jalkanen ◽  
J. Balzani
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Optical Measurements ◽  
Light Path ◽  
The Baltic Sea ◽  
So2 Emission ◽  
The North ◽  
Geometric Approximation ◽  
The North Sea ◽  
The Baltic

Abstract. A unique methodology to measure gas fluxes of SO2 and NO2 from ships using optical remote sensing is described and demonstrated in a feasibility study. The measurement system is based on Differential Optical Absorption Spectroscopy using reflected skylight from the water surface as light source. A grating spectrometer records spectra around 311 nm and 440 nm, respectively, with the telescope pointed downward at a 30° angle from the horizon. The mass column values of SO2 and NO2 are retrieved from each spectrum and integrated across the plume. A simple geometric approximation is used to calculate the optical path. To obtain the total emission in kg h−1 the resulting total mass across the plume is multiplied with the apparent wind, i.e. a dilution factor corresponding to the vector between the wind and the ship speed. The system was tested in two feasibility studies in the Baltic Sea and Kattegat, from a CASA-212 airplane in 2008 and in the North Sea outside Rotterdam from a Dauphin helicopter in an EU campaign in 2009. In the Baltic Sea the average SO2 emission out of 22 ships was (54 ± 13) kg h−1, and the average NO2 emission was (33 ± 8) kg h−1, out of 13 ships. In the North Sea the average SO2 emission out of 21 ships was (42 ± 11) kg h−1, NO2 was not measured here. The detection limit of the system made it possible to detect SO2 in the ship plumes in 60% of the measurements when the described method was used. A comparison exercise was carried out by conducting airborne optical measurements on a passenger ferry in parallel with onboard measurements. The comparison shows agreement of (−30 ± 14)% and (−41 ± 11)%, respectively, for two days, with equal measurement precision of about 20%. This gives an idea of the measurement uncertainty caused by errors in the simple geometric approximation for the optical light path neglecting scattering of the light in ocean waves and direct and multiple scattering in the exhaust plume under various conditions. A tentative error budget indicates uncertainties within 30–45% but for a reliable error analysis the optical light path needs to be modelled. A ship emission model, FMI-STEAM, has been compared to the optical measurements showing an 18% overestimation and a correlation coefficient (R2) of 0.6. It is shown that a combination of the optical method with modelled power consumption can estimate the sulphur fuel content within 40%, which would be sufficient to detect the difference between ships running at 1% and at 0.1%, limits applicable within the IMO regulated areas.

scholarly journals Temporal change of the Baltic Sea–North Sea blue mussel hybrid zone over two decades

2017 ◽  
Vol 164 (11) ◽  
Author(s):  
Petr Strelkov ◽  
Marina Katolikova ◽  
Risto Väinolä
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Hybrid Zone ◽  
Temporal Change ◽  
Blue Mussel ◽  
The Baltic Sea ◽  
The Baltic
Sign in / Sign up

Export Citation Format

Share Document