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  • 1
    Electronic Resource
    Electronic Resource
    The accumulation and release of polysaccharides by planktonic cells and the subsequent bacterial response during a controlled experiment (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 29 (1999), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seawater from the northern Adriatic, with low phosphorus (0.03 μM) and nitrogen (1.0 μM NO3 and 1.0 μM NH4) concentration, was incubated for 12 days in 20-l polycarbonate carboys. The addition of a nutrient mixture (0.6 μM PO4, 5.1 μM NO3, 1.8 μM NH4, 10.6 μM SiO2) induced a strong diatom bloom, reaching 25 μg l−1 Chl a. Primary and bacterial production were stimulated by the initial enrichment of nitrogen and phosphorus but ceased when N and P depletion occurred after 4 days. Inorganic N exhaustion resulted in a significant production (and accumulation) of dissolved and particulate carbohydrates. The initial accumulation of carbohydrates (CHO) in the particulate phase was followed 2 days later by a significant release of dissolved CHO. The bacterial response to this organic carbon source, as reflected by glucosidase activity, was probably inhibited by the severe P limitation following the phytoplankton bloom. In the exponential phase, when P concentration was sufficiently high to sustain a significant glucosidase activity, no increase in either dissolved organic carbon or dissolved total CHO was observed. We hypothesise that the periodic accumulation of dissolved organic carbon in the northern Adriatic is due to an excessive nitrogen enrichment followed by a concurrent N and P limitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6941.1999.tb00626.x
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  • 2
    Electronic Resource
    Electronic Resource
    Group-specific phytoplankton biomass/dissolved carbohydrate relationships in the Gulf of Trieste (Northern Adriatic) (1997)
    Springer
    Hydrobiologia 363 (1997), S. 191-205 
    Details
    ISSN: 1573-5117
    Keywords: carbohydrates ; dissolved organic carbon ; photosynthetic pigments ; phytoplankton ; coastal waters ; northern Adriatic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Distribution of carbohydrates (CHO) and photosynthetic pigments werestudied in the Gulf of Trieste, northern Adriatic Sea, during the period ofsummer stratification with a special emphasis on determining the impact ofthe taxonomic composition and concentration of phytoplankton biomass on thecarbohydrate levels in the water column. Dissolved total carbohydrates(DTCHO), dissolved monosaccharides (DMCHO) as well as particulatecarbohydrates (PTCHO) were determined using the colorimetric MBTH-method,while pigment biomarkers of the phytoplankton biomass were determined byreversed-phase HPLC. Concentrations of the total CHO (dissolved+particulate) varied in a wide range from 173 µg Cl™1 to 1552 µg C l™1. The percentage ofPTCHO in the total CHO concentration was relatively low(4–25%), indicating that the main pool of CHO was in thedissolved phase. The contribution of DTCHO to the total dissolved organiccarbon (DOC) in late summeontribution r was highly variable(10–65%) with an average value of 20 ± 14%, whilein early summer this percentage was somewhat lower and less variable (range11–23%; average 17± 3%). Analyses of biomarkerpigments revealed a very high diversity and a rather heterogenous verticaland spatial distribution of the phytoplankton biomass during the period ofsummer stratification. In September 1994, the predominant taxonomic groupsof phytoplankton were prymnesiophytes, diatoms, silicoflagellates,cyanobacteria and, especially in the bottom layer, dinoflagellates. Arelatively good correlation (r2 =0.51) found betweenDTCHO and chl a suggested that DTCHO were mainly of phytoplankton origin.Furthermore, a concomitant increase of DTCHO with peridinin and fucoxanthinindicated that dinoflagellates and diatoms had a decisive impact on CHOlevels in the water column. By contrast, early summer phytoplankton (June),which was dominated by prymnesiophytes, exhibited a comparatively lowerimpact on the CHO distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003190125386
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