Eutrophication and effects of algal bloom in the south–western part of the Curonian Lagoon alongside the Curonian Spit

Aleksandrov, S. V.; Krek, Aleksander; Bubnova, E. S.; Danchenkov, Aleksandr

doi:10.5200/baltica.2018.31.01

Cited by 23 publications

(9 citation statements)

References 15 publications

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“…In natural aquatic environments, nitrate is permanently reduced to dinitrogen by denitrifying bacteria via biological denitrification [70]. With the warming weather, nitrate consumption increases due to more intense production, following the typical pattern observed in natural waters [71][72][73]. Consequently, the concentration of N/NO 3 − reaches its minimum values (Figure 3).…”

Section: Seasonal Changes In N and P Concentrations And Distribution ...mentioning

confidence: 83%

Nutrient Loadings and Exchange between the Curonian Lagoon and the Baltic Sea: Changes over the Past Two Decades (2001–2020)

Stakėnienė,

Jokšas,

Kriaučiūnienė

et al. 2023

Water

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The Baltic Sea faces prolonged eutrophication due to nutrient pollution, with the Nemunas River regulating nutrient input via the Curonian Lagoon. In this study, we aimed to assess the seasonal variations and changes over the past two decades in nutrient concentrations within the Curonian Lagoon–Baltic Sea transitional zone, and to identify the main factors affecting these trends. We observed slightly reduced nutrient levels in the lagoon and the Klaipėda Strait and increased nitrogen loadings in the Baltic Sea nearshore over time. Between 2007 and 2009, the average total nitrogen (TN) concentrations in the Klaipeda Strait and the Baltic Sea were 1.60 ± 0.25 and 0.54 ± 0.04 mg/L, respectively, while the average total phosphorus (TP) concentrations in the Klaipeda Strait and the Baltic Sea were 0.061 ± 0.04 and 0.03 ± 0.01 mg/L, respectively. Between 2018 and 2020, TN concentrations in the Strait and the Sea were 1.2 ± 0.36 and 0.65 ± 0.32 mg/L, respectively, while the average TP concentrations in the Klaipeda Strait and the Baltic Sea were 0.025 ± 0.002 and 0.021 ± 0.002 mg/L, respectively. The average annual amount of TN and TP entering the Curonian Lagoon from the sea was 2736 t and 162 t, respectively. Significantly higher nutrient influx to the Baltic Sea was recorded reaching 32,302 t for TN and 1278 t for TP. Nutrient concentrations correlated with water temperature, salinity, and dissolved oxygen, influenced by seasonal runoff patterns and climate change. Over time, there have been noticeable shifts in environmental conditions, including rising temperatures, decreasing oxygen levels, salinity changes, increased evaporation, and reduced precipitation.

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Section: Seasonal Changes In N and P Concentrations And Distribution ...mentioning

confidence: 83%

Nutrient Loadings and Exchange between the Curonian Lagoon and the Baltic Sea: Changes over the Past Two Decades (2001–2020)

Stakėnienė,

Jokšas,

Kriaučiūnienė

et al. 2023

Water

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“…Additional nutrient load can also directly affect the Curonian Lagoon of the Baltic Sea, which is already subjected to significant eutrophication (Belykh et al 2013;Malfanov et al 2017;Aleksandrov et al 2018;Bartoli et al 2018;Vybernaite-Lubiene et al 2018). Phytoplankton monitoring, including toxic cyanobacteria, should be an essential part of biological monitoring in the River Neman and its major tributaries, such as the River Viliya (Neris).…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton of the transboundary River Viliya (Neris): community structure and toxic cyanobacterial blooms

Адамович

Михеева

Zhukava

et al. 2021

Baltica

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The 2011–2012 data on the hydrochemical mode of the transboundary River Viliya (Neris) and two of its tributaries in the territory of the Republic of Belarus and on structure of the phytoplankton community therein are presented. High phytoplankton biomass was determined in the summer period. For the first time, the presence of microcystin synthase genes (mcyE) was detected in the River Viliya (Neris), and four variants of microcystins were determined employing the MALDI-TOF method. Similarities in the species composition (including toxic species) of cyanobacteria from the River Viliya (Neris) and from the Curonian Lagoon of the Baltic Sea were noted. It can be assumed that the phytoplankton community structure of rivers can influence algal community formation in the downstream areas as well as in the coastal estuarine lagoons that eventually receive water from these rivers.

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“…The authors of [60] showed that settling velocities for the total suspended sediments in the Curonian Lagoon are very low when positively buoyant cyanobacteria are present. Pilkaitytė and Razinkovas [62] showed a strong relationship between cyanobacteria biomass and water temperature, while the authors of [70] found a moderately strong relationship between Chl-a concentrations and water temperature. These studies were a starting point for the development of a new formula for settling velocity.…”

Section: An Introduced Formula For Settling Velocitymentioning

confidence: 95%

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

Mėžinė

Ferrarin

Vaičiūtė

et al. 2019

Water

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The aim of this study was to investigate the sediment dynamics in the largest lagoon in Europe (Curonian Lagoon, Lithuania) through the analysis of in situ data and the application of a sediment transport model. This approach allowed to identify the propagation pathway of the riverine suspended sediments, to map erosion-accumulation zones in the lagoon and calculate the sediment budget over a 13-year-long simulation. Sampled suspended sediment concentration data are important for understanding the characteristics of the riverine and lagoon sediments, and show that the suspended organic matter plays a crucial role on the sediment dynamics for this coastal system. The numerical experiments carried out to study sediment dynamics gave satisfactory results and the possibility to get a holistic view of the system. The applied sediment transport model with a new formula for settling velocity was used to estimate the patterns of the suspended sediments and the seasonal and spatial sediment distribution in the whole river–lagoon–sea system. The numerical model also allowed understanding the sensitivity of the system to strong wind events and the presence of ice. The results reveal that during extreme storm events, more than 11.4 × 106 kg of sediments are washed out of the system. Scenarios without ice cover indicate that the lagoon would have much higher suspended sediment concentrations in the winter season comparing with the present situation with ice. The results of an analysis of a long-term (13 years) simulation demonstrate that on average, 62% of the riverine sediments are trapped inside the lagoon, with a marked spatially varying distribution of accumulation zones.

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Eutrophication and effects of algal bloom in the south–western part of the Curonian Lagoon alongside the Curonian Spit

Cited by 23 publications

References 15 publications

Nutrient Loadings and Exchange between the Curonian Lagoon and the Baltic Sea: Changes over the Past Two Decades (2001–2020)

Nutrient Loadings and Exchange between the Curonian Lagoon and the Baltic Sea: Changes over the Past Two Decades (2001–2020)

Phytoplankton of the transboundary River Viliya (Neris): community structure and toxic cyanobacterial blooms

Sediment Transport Mechanisms in a Lagoon with High River Discharge and Sediment Loading

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