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Qualitative and quantitative analysis of Baltic phytoplankton pigments

Ston J., Kosakowska A.

Oceanologia

2000

No. 42 (4)

449-471

The paper presents the results of research into the pigment composition of seawater samples taken from various depths in the Gulf of Gdansk in April and September 1999. Pigments were separated by RP-HPLC, and identification was confirmed by co-injection with reference standards and on-line diode array spectra. The following groups of pigments were identified: chlorophylls: a, b, c1 + c2; photosynthetic carotenoids (PSC) - peridinin, fucoxanthin, alfa-carotene; photoprotecting carotenoids (PPC) - diadinoxanthin, alloxanthin, zeaxanthin, lutein, neoxanthin, violaxanthin and beta-carotene. Quantitative and qualitative diversity in pigment characteristics were observed in both seasons, though lutein and alfa-carotene were not identified in the September samples. The respective April and September concentrations of the functional groups of pigments were: total chlorophylls content 0.47-104.25 and 0.57-13.66 žg dm–3; PSC 0.07-21.23 and 0.02-1.56 žg dm–3; PPC 0.05-14.08 and 0.04-1.79 žg dm–3. Within the PSC group, peridinin and fucoxanthin were dominant in the April samples, but only fucoxanthin in the September ones. Among the PPCs, diadinoxanthin and alloxanthin were dominant in April, zeaxanthin in September. Photosynthetic and photoprotecting carotenoids display a linear correlation with chlorophyll alfa content in all the samples.

Modified relationships between the occurrence of photoprotecting carotenoids of phytoplankton and Potentially Destructive Radiation in the sea [commun.]

Majchrowski R., Ostrowska M.

Oceanologia

1999

No. 41 (4)

589-599

The paper analyses the statistical relationships between photoprotecting pigment concentrations (principally selected groups of carotenoids), chlorophyll a concentrations and absolute values of the natural irradiance in the sea. The data from 404 sites in various regions (the authors' own investigations and data available on the Internet - about 3000 data sets altogether) were examined. This analysis confirms the close relationships between the occurrence of photoprotecting pigments and irradiance at short waves in the PAR range (λ< 480 nm). Modified statistical relationships between the relative concentration of photoprotecting pigments (ratio of photoprotecting pigments to total chlorophyll a concentration) and the Potentially Destructive Radiation (PDR*) have therefore been elaborated. The latter is the quantity of irradiance from the short-wave PAR range absorbed per chlorophyll a mass unit.