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1
Content available remote Inventory of the taxonomical composition of the plankton ciliates in the Curonian Lagoon (SE Baltic Sea)
100%
Griniene E. , Mažeikaite S. , Gasiunaite Z. R.
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tom Vol. 40, No.4
86-95
EN
Species composition of plankton ciliates was studied in the Curonian Lagoon in 2007-2008 and compared to long term investigations dating back to the 1980th. In total, 152 taxa were identified at the level of species or genera. More species (76 species/higher taxa) was found in the estuarine part of the Lagoon due to temporally unstable salinity and the presence of both freshwater and brackish/marine species. Some of the brackish/marine species: Tintinnopsis baltica, Tintinnopsis kofoidi, Cothurnia maritima, Lohmaniella oviformis, Lohmaniella spiralis and Helicostomella subulatum were recorded for the first time in the lagoon. The ciliate community at the freshwater sites was less diverse, containing 63 species/higher taxa in the central stagnant part of the Lagoon and 47 – in the Nemunas River avandelta. The comparison of present and past studies revealed that the use of a single live-counting method could lead to underestimation of small nanociliate species, whereas examination of Lugol fixed material provides relatively poor taxonomic information.
2
Content available remote Tolerance of Paramysis lacustris and Limnomysis benedeni (Crustacea, Mysida) to sudden salinity changes: implications for ballast water treatment
88%
Ovčarenko I. , Audzijonyte A. , Gasiunaite Z. R.
Oceanologia
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2006
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tom No. 48 (S)
231-242
EN
In order to draw implications for ballast water management, we tested the tolerance of two Ponto-Caspian mysid species Paramysis lacustris and Limnomysis benedeni to sudden salinity changes. The naturally stenohaline P. lacustris was more susceptible to higher salinities; its mortality rate at 19 PSU was 60%, whereas exposure to 23 PSU was 100% lethal. The euryhaline L. benedeni survived in salinities of up to 19 PSU, but experienced 100% mortality at 34 PSU. The return of both mysid species to fresh water after the 24 h exposure to higher salinities did not prevent further mortality. Considering the rather high short-term salinity tolerance of both species, a salinity of at least 30 PSU should be used as an appropriate biocide.
3
Content available Bioaccumulation of microcystins in invasive bivalves: a case study from the boreal lagoon ecosystem
88%
Paldavičienė A. , Zaiko A. , Mazur-Marzec H. , Razinkovas-Baziukas A.
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tom No. 57 (1)
93--101
EN
In the current study we present the first report on the bioaccumulation of microcystins (MC) in zebra mussel Dreissena polymorpha from the eutrophic brackish water Curonian Lagoon. The bioaccumulation capacity was related to age structure of mussels and ambient environmental conditions. We also discuss the relevant implications of these findings for biomonitoring of toxic cyanobacteria blooms in the Curonian Lagoon and potential consequences for D. polymorpha cultivation activities considered for the futures as remediation measure. Samples for the analysis were collected twice per year, in June and September, in 2006, 2007 and 2008, from two sites within the littoral zone of the lagoon. The highest microcystin concentrations were measured in mussels larger than 30 mm length and sampled in 2006 (when a severe toxic cyanobacteria bloom occurred). In the following years, a consistent reduction in bioaccumulated MC concentration was noticed. However, certain amount of microcystin was recorded in mussel tissues in 2007 and 2008, when no cyanotoxins were reported in the phytoplankton. Considering high depuration rates and presence of cyanotoxins in the bottom sediments well after the recorded toxic blooms, we assume mechanism of secondary contamination when microcystin residuals could be uptaken by mussels with resuspended sediment particles.
4
Content available remote Curonian Lagoon drainage basin modelling and assessment of climate change impact
88%
Čerkasova N. , Ertürk A. , Zemlys P. , Denisov V. , Umgiesser G.
Oceanologia
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2016
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tom No. 58 (2)
90--102
EN
The Curonian Lagoon, which is the largest European coastal lagoon with a surface area of 1578 km2 and a drainage area of 100,458 km2, is facing a severe eutrophication problem. With its increasing water management difficulties, the need for a sophisticated hydrological model of the Curonian Lagoon's drainage area arose, in order to assess possible changes resulting from local and global processes. In this study, we developed and calibrated a sophisticated hydrological model with the required accuracy, as an initial step for the future development of a modelling framework that aims to correctly predict the movement of pesticides, sediments or nutrients, and to evaluate water-management practices. The Soil and Water Assessment Tool was used to implement a model of the study area and to assess the impact of climate-change scenarios on the run-off of the Nemunas River and the Minija River, which are located in the Curonian Lagoons drainage basin. The models calibration and validation were performed using monthly streamflow data, and evaluated using the coefficient of determination (R2) and the Nash-Sutcliffe model efficiency coefficient (NSE). The calculated values of the R2 and NSE for the Nemunas and Minija Rivers stations were 0.81 and 0.79 for the calibration, and 0.679 and 0.602 for the validation period. Two potential climate-change scenarios were developed within the general patterns of near-term climate projections, as defined by the Intergovernmental Panel on Climate Change Fifth Assessment Report: both pessimistic (substantial changes in precipitation and temperature) and optimistic (insubstantial changes in precipitation and temperature). Both simulations produce similar general patterns in river-discharge change: a strong increase (up to 22%) in the winter months, especially in February, a decrease during the spring (up to 10%) and summer (up to 18%), and a slight increase during the autumn (up to 10%).
5
Content available remote Impact of invasive benthic crustaceans on the resuspension of bottom sediments : an experimental study
75%
Zaiko A. , Olenin S.
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2004
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tom Vol. 33, No. 3
99--110
EN
The resuspension process caused by the burrowing activity of three Ponto-Caspian amphipod species (Pontogammarus robustoides, P. crassus and Chaetogammarus ischus) introduced to the Curonian Lagoon, Baltic Sea, was studied in a laboratory. The experimental set-up included aquaria with three types of bottom sediments: 1) sand; 2) sand with pebbles; 3) sand with stones up to 30 cm in diameter. The experimental aquaria contained amphipods in numbers that mimicked their density in situ, while control aquaria contained no animals. Water was sampled from three different layers (1, 5, and 9 cm above the sediment surface) from experimental and control aquaria and analyzed with a spectrophotometer at a wavelength of 660 nm in order to estimate the density of suspended material. The burrowing activity of the amphipods in all sediment types increased the amount of suspended material throughout the studied water layer (10 cm). The most visible effect was detected above the sandy bottom with large stones, the least – above the sandypebble bottom. The conclusion was drawn that the invasive burrowing amphipods can increase the resuspension of bottom sediments in invaded ecosystems.
6
Content available remote (137)Cs activity distribution in the Lithuanian coastal waters of the Baltic Sea
75%
Davuliene L. , Tarasiuk N. , Spirkauskaite N. , Trinkunas G. , Valkunas L.
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tom No. 49 (1)
71-90
EN
The main (137)Cs accumulation zone in the study area was found to be located at depths below the 50-metre isobath, i.e. below the layer of hydrodynamic activity. In coastal waters not influenced by the fresh water discharge from the Curonian Lagoon, (137)Cs occurs mostly in soluble form. The particulate 137Cs activity concentration in the marine area affected by Curonian Lagoon water can make up 10% of the total (137)Cs activity concentration. The circulation model was developed to assess the distribution of artificial radionuclides in Lithuanian territorial waters. The model was validated on the basis of data acquired during the measurement campaign in the Lithuanian part of the Baltic Sea and the Curonian Lagoon in the years 1999-2001. The model enables the (137)Cs activity concentration to be simulated as a passive admixture (error within c. 15%).
7
Content available Curonian Lagoon drainage basin modelling and assessment of climate change impact
75%
Cerkasova N. , Erturk A. , Zemlys P. , Denisov V. , Umgiesser
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2016
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tom 58
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nr 2
8
Content available Absence of evidence for viral infection in colony-embedded cyanobacterial isolates from the Curonian Lagoon
63%
Sulcius S. , Staniulis J. , Paskauskas R. , Olenina I. , Salyte A. , Ivanauskaite A. , Griniene E.
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nr 3
9
Content available Impact of climate change on the Curonian Lagoon water balance components, salinity and water temperature in the 21st century
63%
Jakimavicius D. , Kriauciuniene J. , Sarauskiene D.
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tom 60
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nr 3
10
Content available 137Cs activity distribution in the Lithuanian coastal waters of the Baltic Sea
63%
Davuliene L. , Tarasiuk N. , Spirkauskaite N. , Trinkunas G. , Valkunas L.
Oceanologia
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2007
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tom 49
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nr 1
EN
The main 137Cs accumulation zone in the study area was found to be located at depths below the 50-metre isobath, i.e. below the layer of hydrodynamic activity. In coastal waters not influenced by the fresh water discharge from the Curonian Lagoon, 137Cs occurs mostly in soluble form. The particulate 137Cs activity concentration in the marine area affected by Curonian Lagoon water can make up 10% of the total 137Cs activity concentration. The circulation model was developed to assess the distribution of artificial radionuclides in Lithuanian territorial waters. The model was validated on the basis of data acquired during the measurement campaign in the Lithuanian part of the Baltic Sea and the Curonian Lagoon in the years 1999–2001. The model enables the 137Cs activity concentration to be simulated as a passive admixture (error within c. 15%).
11
Content available Bioaccumulation of microcystins in invasive bivalves: A case study from the boreal lagoon ecosystem
51%
Paldaviciene A. , Zaiko A. , Mazur-Marzec H. , Razinkovas-Baziukas A.
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tom 57
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nr 1
12
Content available First report of endosymbionts in Dreissena polymorpha from the brackish Curonian Lagoon, SE Baltic Sea
51%
Chuseve R. , Mastitski S. E. , Zaiko A.
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nr 4
13
The occurrence, food and size structure of smelt [Osmerus eperlanus L.] larvae in the Lithuanian part of the Curonian Lagoon
51%
Ziliukiene V.
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2002
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nr 2
14
Inventory of the taxonomical composition of the plankton ciliates in the Curonian Lagoon (SE Baltic Sea)
44%
Griniene E. , Mazeikaite S. , Gasiunaite Z. R.
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nr 4
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