Original scientific paper

Fatty Acid Signatures from Bacteria at the Freshwater/Seawater Boundary of the Krka Estuary in Winter, Spring and Autumn

A. Saliot ; Laboratoire de Physique et Chimie Marines de lUniversité, Pierre et Marie Curie, Observatoire des Sciences de ITJnivers; UA CNRS n° 2076; 4 Place Jussieu; 75252 Paris Cedex 05, France
J. Laureillard ; Laboratoire de Physique et Chimie Marines de lUniversité, Pierre et Marie Curie, Observatoire des Sciences de ITJnivers; UA CNRS n° 2076; 4 Place Jussieu; 75252 Paris Cedex 05, France
S. Peulve ; Laboratoire de Physique et Chimie Marines de lUniversité, Pierre et Marie Curie, Observatoire des Sciences de ITJnivers; UA CNRS n° 2076; 4 Place Jussieu; 75252 Paris Cedex 05, France
J. Fillaux ; Laboratoire de Physique et Chimie Marines de lUniversité, Pierre et Marie Curie, Observatoire des Sciences de ITJnivers; UA CNRS n° 2076; 4 Place Jussieu; 75252 Paris Cedex 05, France

Abstract

Distribution of fatty acids was determined at the halocline and in adjacent brackish and marine waters in the Krka Estuary, on the East coast of the Adriatic Sea, in winter 1987, spring 1988 and fall 1990. Particulate matter (> 0.7 pm) was extracted and analyzed for fatty acids by gas chromatography and gas chromatography/mass spectrometry. Different groups of fatty adds were examined: branched and monounsaturated (vaccenic). Bacterial signatures were highly variable in the estuary, depending on season and the extent of accumulation of organic matter at the halocline. Imprint of branched fatty acids, probably representative for the largest bacterial populations, varied by three orders of magnitude. This imprint was generally low at marine stations with an exception of fall 1990, and high in river/brackish waters. Bacterial signatures were interpreted in terms of relationship between their occurrence and growth conditions expressed as suspended matter, organic carbon and chlorophyll a concentrations, as well as nature of organic matter in various water types, fresh, brackish and marine.

Keywords

Hrčak ID:

135623

URI

https://hrcak.srce.hr/135623

Publication date:

3.4.1997.

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