Articles

Title:	Short-term fluctuations of chlorophyll a fluorescence versus diurnal variations of solar radiation in the surface water of the Gdańsk Basin
Authors:	Falkowska Lucyna Magulski Rafał Dunajska Dominika Pryputniewicz Dorota Sikorowicz Gabriela
Abstract:	Measurements of chlorophyll a fluorescence accompanied by solar radiation measurements were carried out during two spring cruises in the region of the Gdańsk Basin. Chlorophyll a 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 a 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 a fluorescence and chlorophyll a concentration was determined. It was revealed that the decline in chlorophyll a concentration in the surface water layer resulted from the photodegradation of chlorophyll a 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.
DOI:
Type of paper:	Original research paper
Pages:	57 to 68
Cytation:	Magulski R., Falkowska L., Dunajska D., Pryputniewicz D., Sikorowicz G., 2004, Short-term fluctuations of chlorophyll a fluorescence versus diurnal variations of solar radiation in the surface water of the Gdańsk Basin, Ocean. Hydrob. Studies, 33(3
Keywords:	chlorophyll a, fluorescence, pheophytine a, irradiation, Gdańsk Basin
Year:	2004
Category:
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