IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Effect of salinity on nitrogenase activity and composition of the active diazotrophic community in intertidal microbial mats
Severin, I.; Confurius-Guns, V.; Stal, L.J. (2012). Effect of salinity on nitrogenase activity and composition of the active diazotrophic community in intertidal microbial mats. Arch. Microbiol. 194(6): 483-491. dx.doi.org/10.1007/s00203-011-0787-5
In: Archives of Microbiology. Springer: Heidelberg; Berlin. ISSN 0302-8933, more
Peer reviewed article  

Available in  Authors 

Keywords
Author keywords
    Salinity; Microbial mat; Nitrogen fixation; Cyanobacteria;Proteobacteria

Authors  Top 
  • Severin, I., more
  • Confurius-Guns, V., more
  • Stal, L.J., more

Abstract
    Microbial mats are often found in intertidal areas experiencing a large range of salinities. This study investigated the effect of changing salinities on nitrogenase activity and on the composition of the active diazotrophic community ( transcript libraries) of three types of microbial mats situated along a littoral gradient. All three mat types exhibited highest nitrogenase activity at salinities close to ambient seawater or lower. The response to lower or higher salinity was strongest in mats higher up in the littoral zone. Changes in nitrogenase activity as the result of exposure to different salinities were accompanied by changes in the active diazotrophic community. The two stations higher up in the littoral zone showed expression by ( and ) and ( and ). At these stations, a decrease in the relative contribution of to the transcript libraries was observed at increasing salinity coinciding with a decrease in nitrogenase activity. The station at the low water mark showed low cyanobacterial contribution to transcript libraries at all salinities but an increase in deltaproteobacterial transcripts under hypersaline conditions. In conclusion, increased salinities caused decreased nitrogenase activity and were accompanied by a lower proportion of cyanobacterial transcripts.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors