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

100%

Skórczewski P. , Mudryk Z.

2009

tom Vol. 38, No.4

89-101

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.

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

88%

Obolewski K.

tom Vol. 40, No.4

52-63

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.

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

51%

Kałas M. , Misiewicz E.

Biuletyn Instytutu Morskiego w Gdańsku

2017

tom Vol. 32, No. 1

37--45

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

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