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Spatial variability and germination potential of cyanobacterial akinetes in sediments of deep dimictic lakes

  • Nostocales form thick-walled, resting cells (akinetes) for overwintering in lake sediments of Central Europe. The pelagic Nostocales population recruits after the germination of akinetes, which mainly takes place in the spring with increasing temperatures and light intensities. The study aimed to i) characterize the sediment surfaces inhabited by viable akinetes that potentially contribute to the formation of a pelagic population, and ii) estimate the inoculum size of the available sedimentary akinete pool. We investigated the horizontal distribution of akinetes in sediments and the seasonal course of light and temperature in two deep dimictic lakes (Lake Stechlinsee, max. depth 69 m and Lake Scharmützelsee, max. depth 29.5 m; NE Germany). The akinete pool was calculated and the potential inoculum was estimated using assumed light and temperature data for akinete germination. The akinete abundance in sediments depended on the basin morphometry and increased with water depth. Only a small proportion of the viable akinete pool inNostocales form thick-walled, resting cells (akinetes) for overwintering in lake sediments of Central Europe. The pelagic Nostocales population recruits after the germination of akinetes, which mainly takes place in the spring with increasing temperatures and light intensities. The study aimed to i) characterize the sediment surfaces inhabited by viable akinetes that potentially contribute to the formation of a pelagic population, and ii) estimate the inoculum size of the available sedimentary akinete pool. We investigated the horizontal distribution of akinetes in sediments and the seasonal course of light and temperature in two deep dimictic lakes (Lake Stechlinsee, max. depth 69 m and Lake Scharmützelsee, max. depth 29.5 m; NE Germany). The akinete pool was calculated and the potential inoculum was estimated using assumed light and temperature data for akinete germination. The akinete abundance in sediments depended on the basin morphometry and increased with water depth. Only a small proportion of the viable akinete pool in shallow water areas contributed as inoculum to pelagic population. The potential inoculum size in Lake Scharmützelsee was larger than in Lake Stechlinsee.show moreshow less

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Metadaten
Author: Jessica Ramm
URN:urn:nbn:de:kobv:co1-opus4-41552
Parent Title (English):PLANKTON RESTING STAGES 2015 WORKSHOP: Geological, Ecological and Evolutionary Perspectives, held in Hanko (Tvärminne Zoological Station), Finnland, 5-8 October 2015
Contributor(s): Matthias Knie, Jacqueline Rücker, Brigitte Nixdorf
Document Type:Conference proceeding
Language:English
Year of Completion:2015
Release Date:2017/04/04
Tag:Akinetes; Cyanobacteria; Dimitic lakes; Sediments
GND Keyword:Cyanobakterien; Limnobakteriologie; Seesediment
Institutes:Fakultät 2 Umwelt und Naturwissenschaften / FG Gewässerökologie
Other Notes:Poster
Licence (German):Keine Lizenz vergeben. Es gilt das deutsche Urheberrecht.
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