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Composition of organic matter in sediments facing a river estuary (Tyrrhenian Sea): relationships with bacteria and microphytobenthic biomass by Mauro Fabiano; Roberto Danovaro is a Environmental Science article available to read on EtoBox.

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The relationships between the biochemical composition of sediment organic matter and bacteria and microphytobenthic biomass distribution, were investigated along the coast of Northern Tuscany (Tyrrhenian Sea). Organic matter appeared to be of highly refractory composition. Among the three main biochemical classes, proteins were the major component (0.96 mg g-' sediment d.w.) followed by total carbohydrates (0.81 mg g-' sediment d.w.) and lipids (8.1 g gsediment d.w.). Bacterial number in surface sediments (0-2 cm) ranged from 1.7 to 24.5 x 108 cells g-of sediment dry weight showing a strong decrease with sediment depth. In surface sediments, significant correlations were found between bacterial biomass and protein concentration. Bacterial activity (measured by the frequency of dividing cells) was significantly related to lipid concentration. Bacterial and microphytobenthic biomass accounted for 3.1 and 18.1% respectively of the sediment organic carbon. In surface sediments bacterial lipids accounted, on average, for 27 % of total lipids, whereas bacterial proteins and carbohydrates accounted for 2.5 and 0.5% of total proteins and carbohydrates, respectively. The benthic degradation

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Author

Mauro Fabiano; Roberto Danovaro

Publisher

Springer; Springer-Verlag; Springer (Kluwer Academic Publishers); Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-5141)

Published

1994

Language

EN

Field

Environmental Science (Physical Sciences)