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Short-term variability of heterotrophic bacterioplankton during upwelling off the NW Iberian margin

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dc.contributor.authorBarbosa, Ana B.
dc.contributor.authorGalvão, Helena M.
dc.contributor.authorMendes, Pedro
dc.contributor.authorÁlvarez-Salgado, Xose
dc.contributor.authorFigueiras, Francisco
dc.contributor.authorJoint, Ian
dc.date.accessioned2012-11-29T14:35:39Z
dc.date.available2012-11-29T14:35:39Z
dc.date.issued2001
dc.description.abstractShort-term variability of heterotrophic bacterioplankton was studied in a recently upwelled water mass at the NW Iberian margin (August 1998). Bacterioplankton abundance (BA), biomass (BB), production (BP), and specific production (SBP) were monitored during two Lagrangian drift experiments, one along the shelf-edge, the other off-shelf along an upwelling filament. Other measurements included chlorophyll a (Chla), primary production (PP), suspended particulate organic carbon (POC) and nitrogen (PON), and dissolved organic carbon (DOC) and nitrogen (DON). Although primary production was significantly higher during the shelf-edge drift experiment, bacterial biomass in the euphotic zone (2.68 to 22.20gC.l_1) was not significantly different from that in the offshore filament. In contrast, bacterial production (0.13-3.52gC.l_1.d_1), estimated using an empirically determined 14C-leucine to carbon conversion factor, and bacterial growth rates (doubling time, DT: 3.9–29.7d), were significantly higher during the shelf-edge drift (BP: 1.500.11 versus 0.500.02gC.l_1.d_1; DT: 6.90.3 versus 16.20.9 d; p_0.01). Depth-integrated BB over the euphotic zone comprised 151% of phytoplankton biomass during shelf-edge drift and 394% under the more oligotrophic conditions in the filament. However, daily BP to net primary production ratios were not significantly different in the two regions (61% versus 71%). BA, BB, BP and SBP were enhanced in the later part of the shelf-edge drift following a pronounced increase in both PP and gross DOC production, suggesting that phytoplankton was a source of substrates for bacteria in recently upwelled waters. This contrasted with the filament drift in which short-term variability of bacterioplankton was much less pronounced and there was no correlation between BP and PP. In both regions, SBP and DOC in the euphotic zone were significantly correlated (p_0.005) indicating some regulatory effect of DOC over bacterial activity. Bacterial carbon demand in the euphotic zone ranged from 22.5 to 44.0molC.m_3.h_1, and 10.6 to 11.3molC.m_3.h_1 and represented 62% and 43% of overall gross DOC production during shelf-edge and filament drift experiments. During the filament drift, the relatively high bacterial doubling times coupled with high percentage of non-metabolised DOC (ca. 60%) suggested control of bacteria by either bioavailability of DOM or inorganic nutrients. Between 40 and 60% of gross DOC production was not metabolised by heterotrophic bacteria, thus allowing DOC net accumulation and off-shore advection.por
dc.identifier.citationBarbosa, AB, HM Galvão, P Mendes, X Álvarez-Salgado, F Figueiras and I Joint, 2001. Short-term variability of heterotrophic bacterioplankton during upwelling off the NW Iberian margin. Progress in Oceanography 51: 339-359.por
dc.identifier.otherAUT: ABA00694; HGA00327;
dc.identifier.urihttp://hdl.handle.net/10400.1/1893
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Science Ltd.por
dc.relation.publisherversionhttp://dx.doi.org/10.1016/S0079-6611(01)00074-Xpor
dc.subjectHeterotrophic bacterioplanktonpor
dc.subjectUpwellingpor
dc.subjectIberiapor
dc.subjectPhytoplanktonpor
dc.subjectShort-termpor
dc.titleShort-term variability of heterotrophic bacterioplankton during upwelling off the NW Iberian marginpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage359por
oaire.citation.startPage339por
oaire.citation.titleProgress in Oceanographypor
oaire.citation.volume51por
person.familyNameBarbosa
person.familyNameGalvão
person.givenNameAna
person.givenNameHelena
person.identifier1291299
person.identifier.ciencia-idF514-2180-4CF8
person.identifier.ciencia-idC51A-2C5A-CF8D
person.identifier.orcid0000-0002-7402-246X
person.identifier.orcid0000-0003-0939-8994
person.identifier.scopus-author-id7103244778
person.identifier.scopus-author-id6505974701
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication5b72648c-41b5-46c0-9a7f-7fa2f514b973
relation.isAuthorOfPublicationef31f343-34f9-4aec-a095-e070235d23b3
relation.isAuthorOfPublication.latestForDiscovery5b72648c-41b5-46c0-9a7f-7fa2f514b973

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