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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Distributions of photosynthetic and photoprotecting pigment concentrations in the water column in the Baltic Sea: an improved mathematical description

100%
Ston-Egiert J., Majchrowski R., Ostrowska M.
Oceanologia
|
2019
|
tom 61
|
nr 1
2

Chlorins in sediments of the Gotland Deep [Baltic Sea]

100%
Kowalewska G., Winterhalter B., Talbot H. M., Maxwell J. R., Konat J.
Oceanologia
|
1999
|
tom 41
|
nr 1
3

Chlorophylls c in bottom sediments as markers of diatom biomass in the southern Baltic Sea

80%
Kowalewska G., Witkowski A., Toma B.
Oceanologia
|
1996
|
tom 38
|
nr 2
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The determination of total protein, total soluble carbohydrate and pigment contents of some macroalgae collected from Gemlik-Karacaali (Bursa) and Erdek-Ormanli (Balikesir) in the Sea of Marmara, Turkey

80%
Dere S., Dalkiran N., Karacaoglu D., Yildiz G., Dere E.
Oceanologia
|
2003
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tom 45
|
nr 3
In this study, 12 taxa from the Chlorophyta, Phaeophyta and Rhodophyta were collected from different depths at Gemlik-Karacaali and Erdek-Ormanlı. A total of 175 specimens from these divisions were used to determine Total Protein (TP), Total Soluble Carbohydrate (TSCH) and Chlorophyll a (Chl a), Chlorophyll b (Chl b), Chlorophyll c (Chl c), total carotenoid (Car) contents and Chl b/Chl a, Chl c/Chl a, Car/Chl a, Car/Chl b, Car/Chl c ratios. TP, TSCH and pigment contents varied significantly with respect to the algal taxa, stations and depth distribution. In addition, individual differences were important in all of the measured parameters. The maximum TP contents (0.94%–31.03%) were determined in some of the Rhodophyta. In some green seaweeds belonging to the genus Ulva L., the TP content was determined between 2.9%–28.1%. Lower TP contents were determined in Cystoseira barbata (Good) C. Agardh (1.1%–4.3%). In contrast to TP contents, TSCH values were very low; maximum TSCH were determined in Ulva species, as were protein contents. In conclusion, the variations in TP, TSCH and pigment in 12 taxa of macroalgae were analysed according to station, depth, and environment.
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Influence of photo- and chromatic acclimation on pigment composition in the sea

80%
Majchrowski R., Ostrowska M.
Oceanologia
|
2000
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tom 42
|
nr 2
The aim of this work was to find statistical relationships between the concentrations of accessory pigments in natural populations of marine phytoplankton and the absolute levels and spectral distributions of underwater irradiance. To this end, empirical data sets from some 600 stations in different parts of the seas and oceans were analysed. These data were obtained from the authors’ own research and from the Internet’s bio-optical data base. They included the vertical distributions of the concentrations of various pigments (identified chromatographically) and the vertical and spectral distributions of the underwater irradiance measured in situ or determined indirectly from bio-optical models. The analysis covered a total of some 4000 points illustrating the dependence of pigment concentration on underwater irradiance characteristics, corresponding to different depths in the sea. The analysis showed that the factor governing the occurrence of photoprotecting carotenoids (PPC) is short-wave radiation λ < 480 nm. A mathematical relationship was established between the relative PPC concentration (relative with respect to the chlorophyll a concentration) and the magnitude of the absorbed radiative energy per unit mass of chlorophyll a from the spectral interval λ < 480 nm, averaged in the water layers Δz = 60 m (or less near the surface) to account for vertical mixing. This absorbed short-wave radiation (λ < 480 nm) was given the name of Potentially Destructive Radiation (PDR∗(z)). Analysis of the relationships between the concentrations of particular photosynthetic pigments (PSP), i.e. chlorophyll b, chlorophyll c, photosynthetic carotenoids (PSC), and the underwater irradiance characteristics indicated that these concentrations were only slightly dependent on the absolute level of irradiance E0(λ), but that they depended strongly on the relative spectral distribution of this irradiance f(λ) = E0(λ)/PAR0. The relevant approximate statistical relationships between the relative concentrations of particular PSP and the function of spectral fitting Fj , averaged in the layer Δz, were derived. Certain statistical relationships between the pigment composition of the phtyoplankton and the irradiance field characteristics are due to the photo- and chromatic acclimation of natural populations of marine phytoplankton. These relationships can be applied in models of the coefficients of light absorption by phytoplankton.
6

Chlorophyll a and its derivatives in recent sediments of the southern Baltic Sea collected in the years 1992-1996

80%
Kowalewska G.
Oceanologia
|
1997
|
tom 39
|
nr 4
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