Wyniki wyszukiwania - Biblioteka Nauki

1

Calculation of the photosynthetic quotient (pq) in the Gulf of Gdansk (southern Baltic)

100%

Wielgat-Rychert M. , Rychert K. , Witek Z. , Zalewski M.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2017

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tom 21

EN

The photosynthetic quotient (PQ) is defined as the molar ratio of oxygen released to the carbon dioxide assimilated during photosynthesis. Calculation of correct PQ values of natural phytoplankton populations is crucial for understanding of carbon budgets but often result in values that differ highly from the expected stoichiometric proportions of photosynthetic products. In the present study, measurements of primary production, that is, CO2 assimilation, performed with the standard isotopic method (14C) and oxygen release estimated during photosynthesis with the light-and-dark bottle method were compared to calculate PQ in the southern Baltic (Gulf of Gdańsk, Poland). The PQ average was 1.28 (ANOVA; F = 872; R2 = 0.92; n = 77; p < 0.001). Neither nitrogen source nor phytoplankton composition was noted to impact PQ values. Very high PQ values in the lower range of production rates (that cannot be explained by the stoichiometric proportion of photosynthesis products) were interpreted as artifacts related to the lower sensitivity of the oxygen method compared to that of the 14C method.

PL

Współczynnik fotosyntetyczny (PQ) definiowany jest jako molowy stosunek uwolnionego tlenu do węgla związanego w procesie fotosyntezy. Obliczenie poprawnej wartości PQ dla populacji fitoplanktonu występujących w środowisku jest zasadnicze dla sporządzenia poprawnego bilansu węgla, ale często obliczone z pomiarów wartości PQ różnią się znacznie od proporcji stechiometrycznych tlenu i węgla w produktach fotosyntezy. W niniejszej pracy przeprowadzono pomiary asymilacji węgla, czyli produkcji pierwotnej, przy użyciu standardowej metody izotopowej (z izotopem węgla 14C) oraz pomiary uwolnionego tlenu za pomocą metody jasnych i ciemnych butelek i na tej podstawie obliczono współczynnik fotosyntetyczny dla Bałtyku południowego (Zatoka Gdańska, Polska). Obliczona średnia wartość PQ wynosiła 1,28 (ANOVA; F = 872; R2 = 0,92; n = 77; p < 0,001). Nie odnotowano, aby wartości PQ zależały od rodzaju azotu wykorzystanego w procesie asymilacji (azot azotanowy czy amonowy) lub od składu fitoplanktonu. Bardzo wysokie wartości PQ obliczone w zakresie niskich wartości produkcji pierwotnej (wartości, które nie zgadzają się zupełnie z proporcjami stechiometrycznymi produktów fotosyntezy) zostały zinterpretowane jako artefakty wynikające z metodyki pomiarowej, ponieważ metoda tlenowa ma znacznie mniejszą czułość niż metoda izotopowa.

2

Modelling multistatic of target detection

100%

Klusek Z. , Elminowicz A. , Tęgowski J. , Szczucka J. , Dragan A.

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2008

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tom Vol. 11

131-138

EN

The paper presents a numerical approach to modelling the detection of underwater targets with a bi- or multistatic active sonar systems in the shallow water areas using different waveform signals. The results of the numerical modelling of surface, bubble clouds and bottom reverberation for CW and using up and down time-varying instantaneous frequency of chirp signals are presented. Some suggestions are made on the basis of the development and practicality for the shallow sea modeling techniques and approaches to existing sonar models. The paper reports the literature of the model components required for active sonar modelling for different propagation conditions. Some examples of scattering of CW and chirp source signals at bubble clouds and corrugated surfaces, and coherence are given. Active propagation and the system performance are surveyed and modelled adaptable to the specific environmental condition of the shallow sea area of the Gdansk Gulf.

3

Application of the hydroacoustic methods to the detailed determination of the seafloor condition in the area of roadsteads and anchorages

100%

Rudowski S. , Gajewski L. , Jezionek E.

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nr 3

4

The first recorded bloom of Pseudochattonella farcimen (Dictyochophyceae, Heterokonta), (Riisberg I., 2008) in the Gulf of Gdańsk

88%

Lotocka M.

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nr 1

139-143

EN

In April 2001 a local bloom of the heterokont phytoflagellate Pseudochattonella farcimen (Riisberg I., 2008) (initially named Chattonella aff. verruculosa) was observed for the first time in the southern part of the Gulf of Gdańsk. The species occurred in high cell densities: the count was 11.5×106 cells dm−3 and the biomass 927.5 μgC dm−3.

5

Energetic values of the body of Macoma balthica L. from the Gulf of Gdansk

88%

Szaniawska A. , Wolowicz M. , Wenne R.

Oceanologia

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1986

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tom 24

6

Seismostratigraphy of the nearshore sediments at Kepa Redlowska, Gulf of Gdansk

88%

Wicher W. , Necel A.

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nr 3

7

The first record of Piscicola pojmanskae Bielecki, 1994 in the Gulf of Gdansk (the Southern Baltic Sea) with species characteristics distinguishing it from Piscicola geometra (Linnaeus, 1758)

75%

Kendzierska H. , Dabrowska A. H. , Cichocka J. M. , Janas U. , Bielecki A.

Oceanological and Hydrobiological Studies

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2014

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tom 43

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nr 3

8

Analysis of the composition and vertical distribution of the macroalgae in Western part of the Gulf of Gdansk in 1979 and 1980

75%

Plinski M. , Florczyk I.

Oceanologia

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1984

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tom 19

9

Hydroid Gonothyraea loveni found on the straightnose pipefish (Nerophis ophidion) in the Gulf of Gdansk – symbiosis, parasitism or biofouling?

75%

Dziubinska A. , Sapota M.

Oceanological and Hydrobiological Studies

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2013

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tom 42

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nr 3

10

The effect of selected dispersants on growth of Chlorella vulgaris Beijernick and Scenedesmus quadricauda (Turpin) Brebisson

75%

Latala A. , Plinski M.

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tom 22

11

The production characteristic of the phytobenthos of the Gulf of Gdansk

75%

Vozzhinskaya V. B. , Plinski M.

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tom 28

12

Holocene diatom biostratigraphy of the SW Gulf of Gdansk, Southern Baltic Sea [part III]

75%

Lesniewska M. , Witak M.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr 4

35-52

13

Water mass exchange between the Gulf of Gdansk and the Baltic Sea

75%

Jankowski A.

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1985

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tom 20

14

Salinity changes in the Bay of Puck due to brine discharge based on in-situ measurements

75%

Robakiewicz M.

Oceanological and Hydrobiological Studies

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2014

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tom 43

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nr 2

15

Oocyte hydration in round goby Neogobius melanostomus from the Gulf of Gdańsk: another invasive strategy?

75%

Kalamarz-Kubiak H. , Guellard T.

Oceanologia

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2019

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tom 61

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nr 4

16

Characteristic of heterotrophic bacteria inhabiting the Gulf of Gdansk

75%

Mudryk Z.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2003

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tom 06

17

Evadne anonyx G. O. Sars, 1897 – the first record of this Ponto-Caspian cladoceran in the Gulf of Gdansk (Baltic Sea)

75%

Bielecka L. , Mudrak-Cegiolka S. , Kalarus M.

Oceanologia

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2014

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tom 56

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nr 1

18

Bacteriological investigation of the surface microlayer of the Gulf of Gdansk

75%

Mudryk Z. , Korzeniewski K. , Falkowska L.

Oceanologia

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1991

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tom 30

19

Verdet constant polarimetric measurement in aqueous solutions of salts

75%

Heldt J. , Szczepanski J. , Kowalewska G. , Zielinski A.

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1985

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tom 20

20

An attempt to determine trophic structure of the bottom fauna in coastal waters of the Gulf of Gdansk

75%

Wiktor K.

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1985

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tom 21