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dc.contributor.authorStorch, Thomas A.
dc.contributor.authorSaunders, George W.
dc.contributor.authorOstrofsky, Milton L.
dc.date.accessioned2018-01-08T14:48:23Z
dc.date.available2018-01-08T14:48:23Z
dc.date.issued1990-02
dc.identifier.citationStorch, T.A., Saunders, G.W., and Ostrofsky, M.L. (1990). Diel Nitrogen Fixation by Cyanobacterial Surface Blooms in Sanctuary Lake, Pennsylvania. Applied and Environmental Microbiology 56(2): 466-471.en_US
dc.identifier.issn0099-2240
dc.identifier.issn1098-5336
dc.identifier.urihttp://hdl.handle.net/10456/45410
dc.description.abstractDiel nitrogen fixation studies were conducted with assemblages of cyanobacteria sampled from surface blooms on Sanctuary Lake, Pa. The studies were conducted between July and September of 1982 to 1985 by using the acetylene reduction technique. Assemblages with the lowest cell concentrations (0.9 x 109 to 1.0 x 109 cells per liter) exhibited nitrogen fixation activity throughout the day, with maximum fixation rates occurring in mid to late afternoon; fixation proceeded throughout the night at rates equivalent to 23 to 28% of the afternoon maximum. In studies conducted with the highest cell concentrations (3.7 x 109 to 6.7 x 109 cells per liter), fixation rates reached maximum values in mid to late morning. The rates declined rapidly throughout the midday period and subsequently ceased from late afternoon until sunrise on the following day. The afternoon decline and cessation of fixation exhibited by high cell concentrations correlated with photosynthetically induced low total CO2 and supersaturating 02 concentrations. The midday decline could be prevented and partially reversed by experimentally lowering 02 and increasing total CO2 concentrations. Under experimental conditions which simultaneously prevented supersaturating 02 concentrations and maintained high total CO2 availability, nitrogen fixation continued throughout the solar day, with maximum rates occurring at midday. These observations indicate that temporal changes in photosynthetic activity may affect diel fluctuations in nitrogen fixation.en_US
dc.language.isoen_USen_US
dc.publisherAmerican Society for Microbiologyen_US
dc.relation.ispartofApplied and Environmental Microbiologyen_US
dc.relation.isversionofaem.asm.org/content/56/2/466.full.pdfen_US
dc.subjectcyanobacteriaen_US
dc.subjectsurface bloomsen_US
dc.subjectnitrogen fixationen_US
dc.subjectSanctuary Lake, Pennyslvaniaen_US
dc.titleDiel Nitrogen Fixation by Cyanobacterial Surface Blooms in Sanctuary Lake, Pennsylvania.en_US
dc.description.versionPublished articleen_US
dc.contributor.departmentBiologyen_US
dc.citation.volume56en_US
dc.citation.issue2en_US
dc.citation.spage466en_US
dc.citation.epage471en_US
dc.contributor.avlauthorOstrofsky, Milton L.


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