Wyniki wyszukiwania - BazTech

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Rozkład stężenia zanieczyszczeń azotu ogólnego i fosforu ogólnego w profilu poprzecznym rzeki Słupi

Wilk P., Orlińska-Woźniak P., Grabarczyk A., Gębala J.

Gospodarka Wodna

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2018

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Nr 3

87--93

PL

Jednym z problemów analiz ilości związków biogennych w wodach powierzchniowych w Polsce jest niewielka ilość danych monitoringowych pochodzących głównie z Państwowego Monitoringu Środowiska, w którym częstotliwość wykonywania badań jest ciągle zbyt mała, aby można było uchwycić zmienność stężenia tych pierwiastków na przestrzeni czasu, a tym samym określić reprezentatywną ilość azotu ogólnego i fosforu ogólnego w wybranym profilu. W artykule przedstawiono wyniki eksperymentu, jaki przeprowadzono w 2014 r. w jednym z profili poprzecznych rzeki Słupi - pobierano na nim próby wody w stałych odstępach czasu przez trzy doby, a następnie oznaczono w nich stężenia azotu ogólnego i fosforu ogólnego. Eksperyment ten miał na celu analizę czasową i przestrzenną rozkładu stężeń biogenów w profilu poprzecznym rzeki i tym samym odpowiedź na pytanie czy dotychczasowe dane dotyczące stężenia biogenów mogą być użyteczne do kalibracji środowiskowych modeli matematycznych i jaki ewentualny błąd wyników modelowania wynikający z rozrzutu wyników należy założyć.

EN

One of the problems encountered during analyses of biogenic compounds in surface waters in Poland is scarce amount of monitoring data, originating mainly from the State Environmental Monitoring, where the frequency of research is still too Iow in order to grasp the variability of concentration of those elements in time and thus determine the representative quantity of total nitrogen and phosphorus in a selected profile. The artide presents the results of an experiment carried out in 2014 in one of the Słupia River transversal profiles- it consisted in collecting samples of water in fixed time intervals for three days and then determine the concentration of total nitrogen and total phosphorus. The goal of the experiment was to analyse the time and spatial distribution of biogenes in the river transversal profile and thus answer the question whether the hitherto data on concentration of biogenes may be useful in calibration of environmental mathematical models and what possible error in the modelling results, resulting from the results spread, should be assumed.

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Hydrophysical parameters of seawater in front of Ustka during the summer season 2013

Kałas M., Misiewicz E.

Biuletyn Instytutu Morskiego w Gdańsku

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2017

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Vol. 32, No. 1

37--45

EN

The article presents spatial distribution of hydrophysical parameters of coastal waters near Ustka, stretching towards the eastern part of Słupsk Bank which appeared there in July 2013. It covers studies of distribution of temperature, salinity and seawater density across the entire cross-section of the water depth. Additionally, directional distributions of the water flows recorded at Baltic Sea, as well as information on local wind speed and direction derived from numerical model of the atmosphere are presented. The resulting image of water density distribution across the entire cross-section of the water depth under steady conditions of stratification allowed determination of character and extent of river water distribution seawards of the Słupia River mouth during summer 2013

PL

W pracy przedstawiono rozkład przestrzenny parametrów hydrofizycznych wody na przybrzeżnych akwenach przedpola Ustki do północnych zboczy wschodniej części Ławicy Słupskiej zarejestrowany w lipcu 2013 roku. W tym celu zbadano rozkłady temperatury, zasolenia oraz gęstości wody morskiej w całym przekroju toni wzdłuż przekroju Ustka - północny stok Ławicy Słupskiej. Dodatkowo przedstawiono rozkłady kierunkowe przepływów wody zarejestrowane w tym czasie na morzu, oraz informacje o kierunkach i prędkościach wiatru lokalnego z prognoz numerycznego modelu atmosfery. Uzyskany obraz rozkładu gęstości wody w całym przekroju toni w warunkach ustalonej stratyfikacji pozwolił na przedstawienie charakteru i zasięgu rozpływu wód rzecznych na przedpolu ujścia Słupi w okresie letnim 2013 roku

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Effects of floodplain Lake restoration on macroinvertegrate assemblages : a case study of the lowland River (The Słupia River, N. Poland)

Obolewski K., Glińska-Lewczuk K., Strzelczak A., Burandt P

Polish Journal of Ecology

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2014

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Vol. 62, nr 3

557--575

EN

A study on the response of macroinvertebrate assemblages to the restoration of hydrological connectivity of an oxbow lake through the channel excavation is presented. The study included a five-year environmental monitoring (hydrological, hydro-chemical measurements and invertebrate sampling) carried out in the years 2008–2009 and 2011–2012 in the floodplain of the Słupia River (N Poland). The results allowed for assessing ecological effects of the hydrotechnical treatments (re-opening of an old river bed, declogging and installation of wooden deflectors) applied in the oxbow restoration. The results confirmed the preliminary hypothesis that the level of hydrological connectivity determines the dynamics of invertebrate fauna communities in river-floodplain systems. Analysis of the data revealed that such reconnection considerably influenced the structure of hydrobionts by altering abiotic habitat conditions. Effects of radical changes in the habitat morphology and hydrodynamic conditions and monitoring of macroinvertebrate assemblages preformed in the restored lake indicated a significant instability of the ecosystem soon after the treatment, what was confirmed by the results of canonical analysis, in which 50% of the total variance remained unexplained. Among factors analysed, water quality parameters explained 21.4% of the total variance in macroinvertebrate communities. However, the hydrobionts showed a significant instability with respect to variable hydrological conditions (flow through the lake) what contributed to a low share of water flow along the oxbow in explaining the total variance. The analysis of long-term changes that occurred in the studied ecosystem showed that the restoration of full hydrological connectivity brought only a short-term increase in benthofauna abundance. The most distinct reorganization in the structure of macroinvertebrate communities was observed in the first year after the reconnection while the consecutive four years brought only insignificant changes, mainly the appearance of a few species, mainly molluscs. Our investigation suggests that the taxonomic composition of macroinvertebrates in the studied oxbow lake having the only one-arm opening, before the improvement of hydrological connectivity, seemed to be more stable and optimal for this kind of habitat, than after the hydrotechnical works, when the ecosystem became passable due to both-arms connections to the river channel. Therefore, semi-lotic oxbows, connected to parent rivers only with one arm, can be properly functioning aquatic ecosystems in river floodplains.

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Composition and density of plant-associated invertebrates in relation to environmental gradients and hydrological connectivity of wetlands

Obolewski K.

Oceanological and Hydrobiological Studies

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2011

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Vol. 40, No.4

52-63

EN

Frequency of occurrence and intensity of the raised water stage determine the structure of invertebrates in the wetland ecosystems of wetland river floodplains. In order to assess the relationships in a regulated, lowland river of moderate climate, samples of water and invertebrates inhabiting submerged shoots of reed Phragmites australis Trin Ex. Stued. were taken from the middle section of the Słupia River and five of its oxbow lakes. The wetlands differed in hydrological activity (type of connection with the river). Redundancy Analysis (RDA) revealed that hydrological connectivity accounted for 37% of the total invertebrate variance, physico-chemical conditions - 21%, while the trophic state only - 7%. Linear regression showed that the highest species richness was observed in oxbow lakes connected to the river with one arm. Diversity and species evenness increased with the increasing hydrological connectivity. The study revealed that plant-associated invertebrates inhabiting wetlands can be the main source for the reconstruction of biodiversity after floods.

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The occurrence of lipolytic bacteria and the activity of extracellular lipases in a riverine ecosystem

Skórczewski P., Mudryk Z.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.4

89-101

EN

This study determined the numbers and distribution of heterotophic and lipolytic bacteria and the activity of lipases in the water of the Słupia River, in the section of the river that flows through the city of Słupsk. From spring to fall the mean number of heterotrophic bacteria remained at a relatively constant level (158.3 × 103 cells cm^-3 – 169.4 × 103 cells cm^-3), whereas in winter a sudden drop to only 18.3 × 103 cells cm^-3 was found. The numbers of heterotrophic bacteria in the whole studied section of the river were similar. The mean number of lipolytic bacteria reached a maximum in spring (12.9 × 103 cells cm^-3), was high in summer (10.5 × 103 cells cm^-3), and reached a minimum (1.3 × 103 cells cm^-3) in winter. Lipolytic bacteria accounted for only 5 to 8% of the total number of heterotrophic bacteria. No marked differences in the numbers of lipolytic bacteria were determined within the section of the river studied. The highest levels of lipase activity were determined in spring (18.9 nM MUF dm^-3 h^-1) and fall (19.9 nM MUF dm-3 h-1), while the lowest (11.0 nM MUF dm^-3 h^-1) were noted in winter. There were no differences in the level of activity of lipolytic enzymes among the sites studied.