Group-specific phytoplankton biomass/dissolved carbohydrate relationships in the Gulf of Trieste (Northern Adriatic)

摘要: Distribution of carbohydrates (CHO) and photosynthetic pigments were studied in the Gulf Trieste, northern Adriatic Sea, during period summer stratification with a special emphasis on determining impact taxonomic composition concentration phytoplankton biomass carbohydrate levels water column. Dissolved total (DTCHO), dissolved monosaccharides (DMCHO) as well particulate (PTCHO) determined using colorimetric MBTH-method, while pigment biomarkers by reversed-phase HPLC. Concentrations CHO (dissolved+particulate) varied wide range from 173 μg C1−1 to 1552 C 1−1. The percentage PTCHO was relatively low (4–25%), indicating that main pool phase. contribution DTCHO organic carbon (DOC) late highly variable (10–65%) an average value 20 ± 14%, early this somewhat lower less (range 11–23%; 17 3%). Analyses biomarker revealed very high diversity rather heterogenous vertical spatial distribution stratification. In September 1994, predominant groups prymnesiophytes, diatoms, silicoflagellates, cyanobacteria and, especially bottom layer, dinoflagellates. A good correlation (r 2 = 0.51) found between chl suggested mainly origin. Furthermore, concomitant increase peridinin fucoxanthin indicated dinoflagellates diatoms had decisive By contrast, (June), which dominated exhibited comparatively distribution.