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High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea.

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Title: High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea.
Authors: Svedén, Jennie B.1 jennie.sveden@su.se, Adam, Birgit1, Walve, Jakob2, Nahar, Nurun1, Musat, Niculina3, Lavik, Gaute2,4, Whitehouse, Martin J.2, Kuypers, Marcel M. M.5, Ploug, Helle1,3
Source: FEMS Microbiology Ecology. Dec2015, Vol. 91 Issue 12, p1-10. 10p. 1 Color Photograph, 3 Charts, 5 Graphs.
Subjects: Aphanizomenon, Low temperatures, Cyanobacteria, Secondary ion mass spectrometry, Photosynthesis, Carbon fixation
Geographic Terms: Baltic Sea
Abstract: Aphanizomenon is a widespread genus of nitrogen (N2)-fixing cyanobacteria in lakes and estuaries, accounting for a large fraction of the summer N2-fixation in the Baltic Sea. However, information about its cell-specific carbon (C)- and N2-fixation rates in the early growth season has not previously been reported. We combined various methods to study N2-fixation, photosynthesis and respiration in field-sampled Baltic Sea Aphanizomenon sp. during early summer at 10°C. Stable isotope incubations at in situ light intensities during 24 h combined with cell-specific secondary ion mass spectrometry showed an average net N2-fixation rate of 55 fmol N cell-1 day-1. Dark net N2-fixation rates over a course of 12 h were 20% of those measured in light. C-fixation, but not N2-fixation, was inhibited by high ambient light intensities during daytime. Consequently, the C:N fixation ratio varied substantially over the diel cycle. C- and N2-fixation rates were comparable to those reported for Aphanizomenon sp. in August at 19°C, using the same methods. High respiration rates (23% of gross photosynthesis) were measured with 14C-incubations and O2-microsensors, and presumably reflect the energy needed for high N2-fixation rates. Hence, Aphanizomenon sp. is an important contributor to N2-fixation at low in situ temperatures in the early growth season. [ABSTRACT FROM AUTHOR]
Copyright of FEMS Microbiology Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: High cell-specific rates of nitrogen and carbon fixation by the cyanobacterium Aphanizomenon sp. at low temperatures in the Baltic Sea.
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  Data: <searchLink fieldCode="AR" term="%22Svedén%2C+Jennie+B%2E%22">Svedén, Jennie B.</searchLink><relatesTo>1</relatesTo><i> jennie.sveden@su.se</i><br /><searchLink fieldCode="AR" term="%22Adam%2C+Birgit%22">Adam, Birgit</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Walve%2C+Jakob%22">Walve, Jakob</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Nahar%2C+Nurun%22">Nahar, Nurun</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Musat%2C+Niculina%22">Musat, Niculina</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Lavik%2C+Gaute%22">Lavik, Gaute</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Whitehouse%2C+Martin+J%2E%22">Whitehouse, Martin J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kuypers%2C+Marcel+M%2E+M%2E%22">Kuypers, Marcel M. M.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Ploug%2C+Helle%22">Ploug, Helle</searchLink><relatesTo>1,3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22FEMS+Microbiology+Ecology%22">FEMS Microbiology Ecology</searchLink>. Dec2015, Vol. 91 Issue 12, p1-10. 10p. 1 Color Photograph, 3 Charts, 5 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Aphanizomenon%22">Aphanizomenon</searchLink><br /><searchLink fieldCode="DE" term="%22Low+temperatures%22">Low temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Cyanobacteria%22">Cyanobacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Secondary+ion+mass+spectrometry%22">Secondary ion mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthesis%22">Photosynthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+fixation%22">Carbon fixation</searchLink>
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  Data: Aphanizomenon is a widespread genus of nitrogen (N2)-fixing cyanobacteria in lakes and estuaries, accounting for a large fraction of the summer N2-fixation in the Baltic Sea. However, information about its cell-specific carbon (C)- and N2-fixation rates in the early growth season has not previously been reported. We combined various methods to study N2-fixation, photosynthesis and respiration in field-sampled Baltic Sea Aphanizomenon sp. during early summer at 10°C. Stable isotope incubations at in situ light intensities during 24 h combined with cell-specific secondary ion mass spectrometry showed an average net N2-fixation rate of 55 fmol N cell-1 day-1. Dark net N2-fixation rates over a course of 12 h were 20% of those measured in light. C-fixation, but not N2-fixation, was inhibited by high ambient light intensities during daytime. Consequently, the C:N fixation ratio varied substantially over the diel cycle. C- and N2-fixation rates were comparable to those reported for Aphanizomenon sp. in August at 19°C, using the same methods. High respiration rates (23% of gross photosynthesis) were measured with 14C-incubations and O2-microsensors, and presumably reflect the energy needed for high N2-fixation rates. Hence, Aphanizomenon sp. is an important contributor to N2-fixation at low in situ temperatures in the early growth season. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of FEMS Microbiology Ecology is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=113488786
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        Value: 10.1093/femsec/fiv131
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        Text: English
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        PageCount: 10
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      – SubjectFull: Aphanizomenon
        Type: general
      – SubjectFull: Low temperatures
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      – SubjectFull: Cyanobacteria
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      – SubjectFull: Carbon fixation
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      – SubjectFull: Baltic Sea
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