AustralieFrV1, Main, Exploration, bibRecord, 00C791

Cyanobacterial community changes in sulfide biotopes of shallow coastal waters of the Baltic Sea

Identifieur interne : 00C791 ( Main/Exploration ); précédent : 00C790; suivant : 00C792

Cyanobacterial community changes in sulfide biotopes of shallow coastal waters of the Baltic Sea

Auteurs : U. Fischer [Allemagne] ; J. Rethmeier [Allemagne] ; A. Rabenstein [Allemagne] ; A. Potthoff [Allemagne]

Source :

Bulletin de l'Institut océanographique : (Monaco) [ 0304-5722 ] ; 1999.

RBID : Pascal:00-0053703

Descripteurs français

Pascal (Inist)
- Cyanobacteria, Communauté microbienne, Structure population, Densité population, Variation saisonnière, Adaptation, Facteur milieu, Sulfure, Sédiment marin, Zone côtière, Eau peu profonde, Mer Baltique.
Wicri :
- topic : Mer Baltique.

English descriptors

KwdEn :
- Adaptation, Baltic Sea, Coastal zone, Cyanobacteria, Environmental factor, Marine sediments, Microbial community, Population density, Population structure, Seasonal variation, Shallow water, Sulfides.

Abstract

Two stations, Hiddensee (station I) and Boiensdorf (station II), of Baltic Sea shallow coastal waters which differ in sulfide concentration and salinity were examined with regard to changes in cyanobacterial community under the influence of sulfide between 1992 and 1994. High abundances of both heterocyst containing filamentous cyanobacteria (e.g. Nodularia) as well as unicellular forms (e.g. Merismopedia) were found at station I in the absence of sulfide in the water column. These groups of cyanobacteria decreased significantly with increasing sulfide concentration up to 4 mM during summer time. Simultaneously, a mass development of 4 gliding, filamentous cyanobacteria (Microcoleus chthonoplastes, Lyngbya aestuarii, Oscillatoria margaritifera and Oscillatoria sp.) occurred. These cyanobacteria exhibit a large tolerance for high sulfide concentrations and form mats of a few cm thickness. The ability to adapt to changing sulfide concentrations is species dependent. No sulfide was detected in the water of station II, where a large abundance of different cyanobacteria species was observed in summer without a mass development of a distinct species. A comparable development of the cyanobacterial coenosis and the occurrence of the same species were observed at both stations during fall and winter. Most of the isolated cyanobacteria oxidize sulfide phototrophically and stoichiometrically to thiosulfate with an intermediate formation of sulfite. Depending on environmental conditions, shifts in the physicochemical gradients (redox potential, oxygen, sulfide) occurrred in the sediments of both stations in the course of a year.

Affiliations:

Links toward previous steps (curation, corpus...)

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to stream Main, to step Curation: 00C791

Le document en format XML

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<front><div type="abstract" xml:lang="en">Two stations, Hiddensee (station I) and Boiensdorf (station II), of Baltic Sea shallow coastal waters which differ in sulfide concentration and salinity were examined with regard to changes in cyanobacterial community under the influence of sulfide between 1992 and 1994. High abundances of both heterocyst containing filamentous cyanobacteria (e.g. Nodularia) as well as unicellular forms (e.g. Merismopedia) were found at station I in the absence of sulfide in the water column. These groups of cyanobacteria decreased significantly with increasing sulfide concentration up to 4 mM during summer time. Simultaneously, a mass development of 4 gliding, filamentous cyanobacteria (Microcoleus chthonoplastes, Lyngbya aestuarii, Oscillatoria margaritifera and Oscillatoria sp.) occurred. These cyanobacteria exhibit a large tolerance for high sulfide concentrations and form mats of a few cm thickness. The ability to adapt to changing sulfide concentrations is species dependent. No sulfide was detected in the water of station II, where a large abundance of different cyanobacteria species was observed in summer without a mass development of a distinct species. A comparable development of the cyanobacterial coenosis and the occurrence of the same species were observed at both stations during fall and winter. Most of the isolated cyanobacteria oxidize sulfide  phototrophically and stoichiometrically to thiosulfate with an intermediate formation of sulfite. Depending on environmental conditions, shifts in the physicochemical gradients (redox potential, oxygen, sulfide) occurrred in the sediments of both stations in the course of a year.</div>
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Cyanobacterial community changes in sulfide biotopes of shallow coastal waters of the Baltic Sea

Cyanobacterial community changes in sulfide biotopes of shallow coastal waters of the Baltic Sea

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri