Sulfate reduction in the oligotrophic Lake Stechlin

Sass, Henrik ORCID: https://orcid.org/0000-0001-8740-4224, Babenzien, Christina and Babenzien, Hans-Dietrich 2003. Sulfate reduction in the oligotrophic Lake Stechlin. Advances in Limnology 58 , pp. 37-52.

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Abstract

Vertical distribution of sulfate reduction rates (SRR) and numbers of sulfate-reducing bacteria (SRB) were investigated in littoral and profundal sediments of the oligotrophic Lake Stechlin. During the period of investigation SRR were in the ranged from below 1 to 10 nmol·cm-3·d-1, higher rates were observed only during autumn when a higher nutrient supply was available by infallen leaves from the surounding forrests. The influence of temperature of sulfate-reducing activity was shown in an Arrhenius plot. At temperatures above 25°C activity increase deviated from linearity and above 40°C no activity was detected. The Q10 values for sulfate reduction were 3.1 and 3.0 for littoral and profundal sediments. In littoral sediments oxygen input via advective porwater fluxes was suggested to have also a strong influence on sulfate reduction. The oxic sediment layer was found to have a vertical extension of 5 to 20 mm. Viable counts of sulfate-reducing bacteria were found from 2 to 40·10 3 cm-3 with little decline along the upper 20 cm of the sediment. In contrast in eutrophic or bog lakes numbers of SRB decreased rapidly with depth. The total of 28 pure cultures was obtained and could be affiliated to the genera Desulfovibrio, Desulfomicrobium and the spore-forming genera Desulfosporosinus and Sporomusa. Although the isolates could be grouped into six phylogenetic clusters, the isolates within these cluster showed a higher physiologiocal and genomic diversity, the latter indicated by ERIC-PCR. The nutritional versatility of the isolates can be seen as a basis to occupy different ecological niches within the same habitat. The strains grew in a temperature range which is congruent with the envirnmental temperatures in the natural habitat.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QR Microbiology
Publisher:	Schweizerbart and Borntraeger science publishers
ISSN:	1612-166X
Last Modified:	18 Oct 2022 12:19
URI:	https://orca.cardiff.ac.uk/id/eprint/9346

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