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The current bio-optical study of marine phytoplankton

Woźniak B., Dera J., Ficek D., Ostrowska M., Majchrowski R., Kaczmarek S., Kuzio M.

Optica Applicata

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2002

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Vol. 32, nr 4

731-747

EN

The paper presents the latest results obtained by the Sopot group (the teams of scientists from the Institute of Oceanology, Polish Academy of Sciences in Sopot, and Environmental Physics Department, Pomeranian Pedagogical University in Słupsk) in the bio-optical modelling of the principal light-stimulated processes occurring in marine algae, such as photo- and chromatic-acclimation, light absorption, fluorescence and photosynthesis of marine phytoplankton. The development of the models presented here has not been completed yet. Nevertheless, we have used them as a foundation on which it is possible to construct two practical algorithms for calculating various photosynthetic characteristics at different depths in the sea. The first one allows vertical distribution of the concentration of chlorophyll and other pigments, and primary production to be determined from three input data: chlorophyll a concentration, irradiance and temperature at the sea surface that can be measured remotely. The second one allows us to estimate these characteristic from in situ measurements of some fluorimeric properties of algae.

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Variability of the portion of functional PS2 reaction centres in the light of a fluorometric study

Ficek D., Ostrowska M., Kuzio M., Pogosyan S. I.

Oceanologia

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2000

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No. 42 (2)

243-250

EN

The paper contains a preliminary analysis of the links between the portion fc of functional PS2 reaction centres in the photosynthetic apparatus of marine phytoplankton and environmental factors. The analysis is based inter alia on fluorometric measurements of fc (see Kolber & Falkowski 1993) in water sampled from different depths and trophic types of sea. From the statistical generalisations was derived an analytical form of the relationship between fc, and the optical depth and trophic type of sea (the trophicity index was taken to be the surface concentration of chlorophyll a). According to this relationship, fc rises as the trophicity of the sea does so. Moreover, there is a certain optimal optical depth for each type of water at which the number of functional PS2 reaction centres reaches a maximum. Above or below this depth the value of fc falls. At the present stage of investigations it seems reasonable to assume that this drop in the number of functional PS2 reaction centres close to the surface is due to the destructive effect of excessive irradiance. On the other hand, their reduced number at greater depths, below the fc maximum, can be attributed to the deficit of light and the consequent destruction of reaction centres.

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Kronika

Kuzio M., Turło J., Grynberg M., Blinowski J., Firkowski J.

Postępy Fizyki

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1998

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T. 49, z. 2

113-118

PL

PTF: Komisje, Składki, Oddział Słupski, Oddział Toruński. Dofinansowanie z KBN. Nominacje profesorskie. Nagroda Marii Skłodowskiej-Curie; Nagroda Jabłońskiego. Superpomiar częstości optycznej. FNP pomaga bibliotekom. Europejskie czasopismo fizyczne. Joaquin M. Luttinger (1924-1997). Aleksander Zawadzki (1918-1997).