Impact of the inflow of Vistula river waters on the pelagic zone in the Gulf of Gdańsk**The study was supported by the Polish Ministry of Science and Higher Education as statutory activities of the Department of Fisheries Oceanography and Marine Ecology of the National Marine Fisheries Research Institute (project O-147) and statutory activities of the Department of Ecology of the Pomeranian University in Slupsk (project 11.6.13). This study was also supported by the Polish Ministry of Science and Higher Ed

Wielgat-Rychert, Magdalena; Ameryk, Anetta; Jarosiewicz, Anna; Kownacka, Janina; Rychert, Krzysztof; Szymanek, Lena; Zalewski, M.; Агатова, А. Р.; Lapina, N. M.; Torgunova, N. I.

doi:10.5697/oc.55-4.859

Cited by 20 publications

(3 citation statements)

References 38 publications

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“…In contrast, the 12-fold larger southern Vistula estuary receives high riverine N loads (97 000 t TN yr −1 , Table 1) from a catchment area of intensively cultivated cropland . High concentrations of nutrients and organic matter and high primary production rates (Wielgat-Rychert et al, 2013;Witek et al, 1999) have led to its eutrophied state. The estuaries further differ in their bottom topography and sediment composition, while both estuaries are non-tidal, stratified, and receive their peak riverine N-loads in spring.…”

mentioning

confidence: 99%

Particulate organic matter controls benthic microbial N retention and N removal in contrasting estuaries of the Baltic Sea

Bartl¹,

Hellemann²,

Schulz³

et al. 2018

Preprint

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Abstract. Estuaries worldwide are known to act as <q>filters</q> of land-derived N loads, yet their variable environmental settings can affect microbial nitrogen (N) retention and removal and thus the coastal filter function. We investigated microbial N-retention (nitrification, ammonium assimilation) and N-removal (denitrification, anammox) in the aphotic benthic systems (here defined as: bottom boundary layer [BBL] and sediment) of two Baltic Sea estuaries that differ in riverine N loads, trophic state, bottom topography, and sediment type. Contrary to our expectations, nitrification rates (5&#8211;227&#8201;nmol&#8201;L&#8722;1&#8201;d&#8722;1) in the BBL neither differed between the eutrophied Vistula estuary and the oligotrophic &#214;re estuary, nor between seasons. Ammonium assimilation rates were slightly higher in the oligotrophic &#214;re estuary in spring but did not differ between estuaries in summer (9&#8211;704&#8201;nmol&#8201;L&#8722;1&#8201;d&#8722;1). In the sediment, no anammox was found in either estuary and denitrification rates were higher in the eutrophied (349&#8201;&#177;&#8201;117&#8201;&#181;mol&#8201;N&#8201;m&#8722;2&#8201;d&#8722;1) than in the oligotrophic estuary (138&#8201;&#177;&#8201;47&#8201;&#181;mol&#8201;N&#8201;m&#8722;2&#8201;d&#8722;1). Irrespective of their differences, in both estuaries the quality of the mainly phytoplankton-derived particulate organic matter (POM) &#8211; evaluated by means of C&#8201;:&#8201;N and POC&#8201;:&#8201;Chl.a ratios &#8211; seemed to control N-cycling processes through the availability of particulate organic N and C as substrate sources. Our data suggest, that in stratified estuaries, phytoplankton-derived POM is an essential link between riverine N loads and benthic N cycling and may function as a temporary N reservoir via long particle residence time or coastal parallel transport. Even at low process rates, effective coastal filtering would thus be achieved by the increased time available for the recycling of N via microbial retention processes until its permanent removal via denitrification.

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confidence: 99%

Particulate organic matter controls benthic microbial N retention and N removal in contrasting estuaries of the Baltic Sea

Bartl¹,

Hellemann²,

Schulz³

et al. 2018

Preprint

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“…The average A T concentration in the Bay of Puck based on this study is equal to 1941 ± 126mmol kg −1 and was significantly higher than the estimated average A T concentration(A T =1653 ± 1.4mmol kg −1 ) based on A T -S dependence from Bełdowski et al (2010) and slightly lower than that calculated based on A T -S dependence from Stokowski et al (2021) (S=7, A T =2049 ± 10.6mmol kg −1 ). Knowing that the Bay of Puck is under the limited influence of the Vistula River, as westerly winds are predominant in that region, and the river outflow is typically directed east along the coast and slowly entrained into the Baltic anticyclonic current (Matciak and Nowacki, 1995;Wielgat-Rychert et al, 2013) we propose that the increased surface seawater concentration of A T in comparison to the Central Baltic-Belt Sea-Kattegat region may be mostly a result of SGD derived A T fluxes.…”

Section: A T and Dic Fluxes Via Sgd To The Bay Of Puckmentioning

confidence: 86%

The benthic-pelagic coupling affects the surface water carbonate system above groundwater-charged coastal sediments

Szymczycha,

Böttcher,

Diak

et al. 2023

Front. Mar. Sci.

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Submarine groundwater discharge (SGD) can be a significant source of dissolved nutrients, inorganic and organic carbon, and trace metals in the ocean and therefore can be a driver for the benthic-pelagic coupling. However, the influence of hypoxic or anoxic SGD on the carbonate system of coastal seawater is still poorly understood. In the present study, the production of dissolved inorganic carbon (DIC) and alkalinity (AT) in coastal sediments has been investigated under the impact of oxygen-deficient SGD and was estimated based on the offset between the measured data and the conservative mixing of the end members. Production of AT and DIC was primarily caused by denitrification and sulphate reduction. The AT and DIC concentrations in SGD decreased by approximately 32% and 37% mainly due to mixing with seawater counterbalanced by reoxidation and CO2 release into the atmosphere. Total SGD-AT and SGD-DIC fluxes ranged from 0.1 to 0.2mol m-2 d-1 and from 0.2 to 0.3mol m-2 d-1, respectively. These fluxes are probably the reason why the seawater in the Bay of Puck is enriched in AT and DIC compared to the open waters of the Baltic Sea. Additionally, SGD had low pH and was undersaturated with respect to the forms of the aragonite and calcite minerals of CaCO3. The seawater of the Bay of Puck also turned out to be undersaturated in summer (Inner Bay) and fall (Outer Bay). We hypothesize that SGD can potentially contribute to ocean acidification and affect the functioning of the calcifying invertebrates.

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“…On the other hand, winds blowing from the E, ENE and ESE directions cause the Vistula runoff to move westward. The impact of the Vistula waters in the study area increases during extreme floods when the flood wave can reach up to 27 km from the mouth of the Vistula (Wielgat-Rychert et al 2013). Moreover, the waters of the Vistula have the greatest impact on the nutrient load in the Gulf of Gdańsk.…”

Section: Study Areamentioning

confidence: 94%

Biodiversity of the benthic diatom flora in the coastal zone of the Gulf of Gdańsk: a case study of the Gdynia–Sopot transect

Hetko

Witak

Oliwa

2022

OandHS

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The objective of this study is to determine microhabitat preferences of benthic species occurring in epilithic (living on stones), epipsammic (growing on sand), epipelic (growing on mud) and epiphytic (living on seagrass) assemblages of the shallows of the Gulf of Gdańsk (southern Baltic Sea). The study material was collected from 19 sites along the Gdynia–Sopot coastal zone, including the Port of Gdynia. Most of the identified diatom taxa were observed in two or three microhabitats. However, diatom species living in only one type of microhabitat and those occurring in all analyzed microhabitats were also recorded. Autecological preferences of the identified diatoms indicate organic pollution of the coastal zone of Gdynia and Sopot. However, a higher frequency of α-mesosaprobionts and polysaprobionts indicates an increase in organic pollution in the Port of Gdynia and Marina Sopot, which is associated with intense port activity and large tourist traffic.

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Cited by 20 publications

References 38 publications

Particulate organic matter controls benthic microbial N retention and N removal in contrasting estuaries of the Baltic Sea

Particulate organic matter controls benthic microbial N retention and N removal in contrasting estuaries of the Baltic Sea

The benthic-pelagic coupling affects the surface water carbonate system above groundwater-charged coastal sediments

Biodiversity of the benthic diatom flora in the coastal zone of the Gulf of Gdańsk: a case study of the Gdynia–Sopot transect

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