Respiration and bacterial carbon dynamics in the Amundsen Gulf, western Canadian Arctic
Identifieur interne : 001369 ( Main/Exploration ); précédent : 001368; suivant : 001370Respiration and bacterial carbon dynamics in the Amundsen Gulf, western Canadian Arctic
Auteurs : Dan Nguyen [Canada] ; Roxane Maranger [Canada] ; Jean-Éric Tremblay [Canada] ; Michel Gosselin [Canada]Source :
- Journal of Geophysical Research: Oceans [ 0148-0227 ] ; 2012-09.
Abstract
Respiration rates are fundamental to understanding ecosystem C flux; however, respiration remains poorly characterized in polar oceans. The Circumpolar Flaw Lead (CFL) study provided a unique opportunity to sample the Amundsen Gulf, from November 2007 to July 2008 and follow microbial C dynamics. This study shows that bacterial production (BP) was highly variable, ranging from 0.01 to 2.14 μg C L−1 d−1 (CV = 192%), whereas the range in community respiration (CR) was more conservative from 3.8 to 44.2 μg C L−1 d−1 (CV = 55%), with measurable rates throughout the year. The spring‐summer peak in BP preceded the peak in CR suggesting differential predominant control. From May until July, BP was more related to chlorophyll a concentration (r = 0.68) whereas CR was not. Given the observed high variability, BP was the main driver of bacterial growth efficiency (BGE) (r2 = 0.86). The overall average BGE was low at 4.6%, ranging from 0.20 in winter to a peak of 18.6% during the spring bloom. This study confirms that respiration is an important fate for C in the Amundsen Gulf, and our rate‐based estimates of ecosystem scale CR suggests that considerably more C is respired than could be accounted for by gross primary production (GPP). One of the most plausible explanations for this observed discrepancy is that regenerated primary production is currently underestimated.
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DOI: 10.1029/2011JC007343
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Geophys. Res.</title><idno type="ISSN">0148-0227</idno><idno type="eISSN">2156-2202</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><date type="published" when="2012-09">2012-09</date><biblScope unit="volume">117</biblScope><biblScope unit="issue">C9</biblScope><biblScope unit="page" from="/">n/a</biblScope><biblScope unit="page" to="/">n/a</biblScope></imprint><idno type="ISSN">0148-0227</idno></series><idno type="istex">8A918C6816F4AD3767E8A6151364162795FD8559</idno><idno type="DOI">10.1029/2011JC007343</idno><idno type="ArticleID">2011JC007343</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0148-0227</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Respiration rates are fundamental to understanding ecosystem C flux; however, respiration remains poorly characterized in polar oceans. The Circumpolar Flaw Lead (CFL) study provided a unique opportunity to sample the Amundsen Gulf, from November 2007 to July 2008 and follow microbial C dynamics. This study shows that bacterial production (BP) was highly variable, ranging from 0.01 to 2.14 μg C L−1 d−1 (CV = 192%), whereas the range in community respiration (CR) was more conservative from 3.8 to 44.2 μg C L−1 d−1 (CV = 55%), with measurable rates throughout the year. The spring‐summer peak in BP preceded the peak in CR suggesting differential predominant control. From May until July, BP was more related to chlorophyll a concentration (r = 0.68) whereas CR was not. Given the observed high variability, BP was the main driver of bacterial growth efficiency (BGE) (r2 = 0.86). The overall average BGE was low at 4.6%, ranging from 0.20 in winter to a peak of 18.6% during the spring bloom. This study confirms that respiration is an important fate for C in the Amundsen Gulf, and our rate‐based estimates of ecosystem scale CR suggests that considerably more C is respired than could be accounted for by gross primary production (GPP). One of the most plausible explanations for this observed discrepancy is that regenerated primary production is currently underestimated.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Nguyen, Dan" sort="Nguyen, Dan" uniqKey="Nguyen D" first="Dan" last="Nguyen">Dan Nguyen</name></noRegion><name sortKey="Gosselin, Michel" sort="Gosselin, Michel" uniqKey="Gosselin M" first="Michel" last="Gosselin">Michel Gosselin</name><name sortKey="Maranger, Roxane" sort="Maranger, Roxane" uniqKey="Maranger R" first="Roxane" last="Maranger">Roxane Maranger</name><name sortKey="Maranger, Roxane" sort="Maranger, Roxane" uniqKey="Maranger R" first="Roxane" last="Maranger">Roxane Maranger</name><name sortKey="Tremblay, Jean Ic" sort="Tremblay, Jean Ic" uniqKey="Tremblay J" first="Jean-Éric" last="Tremblay">Jean-Éric Tremblay</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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