Short-term fluctuations of chlorophyll α fluorescence versus diurnal variations of solar radiation in the surface water of the Gdańsk Basin

• Autorzy: Magulski R. , Falkowska L. , Dunajska D. , Pryputniewicz D. , Sikorowicz G.
• Języki publikacji: EN

Abstrakty

EN

Measurements of chlorophyll α fluorescence accompanied by solar radiation measurements were carried out during two spring cruises in the region of the Gdańsk Basin. Chlorophyll α fluorescence, similarly to that of chlorophyll a concentration in the seawater, showed considerable diurnal variability. The measurements provided statistically significant negative correlation coefficients that indicated that chlorophyll α fluorescence is inhibited as solar PAR and UV radiation intensity increases. The approximate range of radiation intensity that corresponded to a clearly marked decline in chlorophyll α fluorescence and chlorophyll α concentration was determined. It was revealed that the decline in chlorophyll a concentration in the surface water layer resulted from the photodegradation of chlorophyll α as well as phytoplankton grazing. In both cases, the resulting observation was an increase of pheophytine a concentration. The vertical migration of phytoplankton was identified as an additional process induced by high radiation levels.

Słowa kluczowe

EN

chlorophyll a; fluorescence; pheophytine a; irradiation; Gdańsk Basin

• Wydawca: Institute of Oceanography University of Gdańsk
• Czasopismo: Oceanological and Hydrobiological Studies
• Rocznik: 2004
• Tom: Vol. 33, No. 3
• Strony: 57--68
• Opis fizyczny: Bibliogr. 20 poz., tab., wykr.

Twórcy

autor

Magulski R.

• Institute of Oceanography, Division of Marine Chemistry and Marine Environment Protection, Gdańsk Universit, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Falkowska L.

• Institute of Oceanography, Division of Marine Chemistry and Marine Environment Protection, Gdańsk Universit, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Dunajska D.

• Institute of Oceanography, Division of Marine Chemistry and Marine Environment Protection, Gdańsk Universit, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Pryputniewicz D.

• Institute of Oceanography, Division of Marine Chemistry and Marine Environment Protection, Gdańsk Universit, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

autor

Sikorowicz G.

• Institute of Oceanography, Division of Marine Chemistry and Marine Environment Protection, Gdańsk Universit, Al. Marszałka Piłsudskiego 46, 81-378 Gdynia, Poland

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