Assessment of salinity-related mortality of freshwater bacteria in the saint lawrence estuary.

Applied and Environmental Microbiology
J PainchaudL Legendre

Abstract

The growth response of freshwater bacteria from the St. Lawrence River, exposed to brackish waters (salinity of 0 to 20(permil)) from the upper estuary, was assessed by a methodology requiring the combined use of dilution cultures and diffusion chambers. The longitudinal distribution of bacterial abundance in waters within this salinity range was also examined. Growth of the freshwater bacteria was reduced by 15 and 50% after exposure to salinities of 10 and 20(permil), respectively. At lower salinities, no growth reduction was observed, and at a salinity of 2(permil), growth was even stimulated. Longitudinal distribution data showed that bacterial abundance also peaked at this salinity. In contrast with an earlier hypothesis, this study shows that the decline of bacterial abundance in the low-salinity waters of the estuary is not caused by salinity-related mortality of freshwater bacteria, because the mixing time between fresh and marine (>20(permil)) waters is relatively long (days). However, results suggest that mortality of freshwater bacteria can be an important process in estuaries with shorter mixing times (hours). The combined use of diffusion chambers and dilution cultures proved to be a valuable methodology for assess...Continue Reading

References

May 1, 1977·Applied and Environmental Microbiology·J E HobbieS Jasper
Jun 1, 1976·Applied and Environmental Microbiology·G J Vasconcelos, R G Swartz
Jun 1, 1983·Applied and Environmental Microbiology·M W RhodesH I Kator
Mar 1, 1983·Applied and Environmental Microbiology·E J Lessard, J M Sieburth
Jan 1, 1984·Applied and Environmental Microbiology·R L FergusonA V Palumbo

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Citations

Oct 6, 2006·Applied and Environmental Microbiology·Claudia PicciniJakob Pernthaler
Apr 2, 2014·Journal of Basic Microbiology·Lei ZhangKeqiang Shao
Sep 10, 2013·Canadian Journal of Microbiology·Lei ZhangJiangyu Dai
Apr 9, 2013·FEMS Microbiology Ecology·Dominique BoeufChristian Jeanthon
Apr 6, 2021·Environmental Science & Technology·Charbel HarbHosein Foroutan

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