Viral distribution and activity in Antarctic waters
Identifieur interne : 003416 ( Main/Exploration ); précédent : 003415; suivant : 003417Viral distribution and activity in Antarctic waters
Auteurs : Nuria Guixa-Boixereu [Espagne] ; Dolors Vaque [Espagne] ; Josep M. Gasol [Espagne] ; Jaime Sanchez-Camara [Espagne] ; Carlos Pedros-Alio [Espagne]Source :
- Deep-sea research. Part 2. Topical studies in oceanography [ 0967-0645 ] ; 2002.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Répartition géographique, Mortalité.
English descriptors
- KwdEn :
Abstract
Variability in abundance of virus-like particles (VLP), VLP decay rates and prokaryotic mortality due to viral infection were determined in three Antarctic areas: Bellingshausen Sea, Bransfield Strait and Gerlache Strait, during December 1995 and February 1996. VLP abundance showed very small spatial variability in the three areas (7 x 106-2 × 107 VLP ml-1). VLP abundance, on the other hand, decreased one order of magnitude from the surface to the bottom, in two stations where deep vertical profiles were sampled. Low seasonal variability in VLP abundance was found when comparing each area separately. Diel VLP variability was also very low. VLP abundance showed the lowest values when solar irradiation was maximal, in two of the three stations where diel cycles were examined. Viral decay rates (VDR) were determined using KCN in two kinds of experiments. Type 1 experiments were performed in 6 stations to determine viral decay. Type 2 experiments were carried out in 2 stations to examine the influence of temperature and organic matter concentration on viral decay. VDR was not influenced by these parameters. Prokaryotic mortality due to viral infection was always higher than that due to bacterivores in the stations where both factors of prokaryotic mortality were measured. Viral infection accounted for all the prokaryotic heterotrophic production in Bellingshausen Sea and Gerlache Strait and for half of the prokaryotic heterotrophic production in Bransfield Strait. These high values of prokaryotic mortality due to viral infection are difficult to reconcile in nature, and more work is necessary to determine the mechanisms involved in the disappearance of viruses.
Affiliations:
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Part 2. Topical studies in oceanography</title><title level="j" type="abbreviated">Deep-sea res., Part 2, Top. stud. oceanogr.</title><idno type="ISSN">0967-0645</idno><imprint><date when="2002">2002</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Deep-sea research. Part 2. Topical studies in oceanography</title><title level="j" type="abbreviated">Deep-sea res., Part 2, Top. stud. oceanogr.</title><idno type="ISSN">0967-0645</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bacterioplankton</term><term>Biological activity</term><term>Geographic distribution</term><term>Infection</term><term>Mortality</term><term>Southern Ocean</term><term>Virus like particle</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Répartition géographique</term><term>Particule type viral</term><term>Activité biologique</term><term>Infection</term><term>Mortalité</term><term>Bactérioplancton</term><term>Mers Antarctiques</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Répartition géographique</term><term>Mortalité</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Variability in abundance of virus-like particles (VLP), VLP decay rates and prokaryotic mortality due to viral infection were determined in three Antarctic areas: Bellingshausen Sea, Bransfield Strait and Gerlache Strait, during December 1995 and February 1996. VLP abundance showed very small spatial variability in the three areas (7 x 10<sup>6</sup>-2 × 10<sup>7</sup> VLP ml<sup>-1</sup>). VLP abundance, on the other hand, decreased one order of magnitude from the surface to the bottom, in two stations where deep vertical profiles were sampled. Low seasonal variability in VLP abundance was found when comparing each area separately. Diel VLP variability was also very low. VLP abundance showed the lowest values when solar irradiation was maximal, in two of the three stations where diel cycles were examined. Viral decay rates (VDR) were determined using KCN in two kinds of experiments. Type 1 experiments were performed in 6 stations to determine viral decay. Type 2 experiments were carried out in 2 stations to examine the influence of temperature and organic matter concentration on viral decay. VDR was not influenced by these parameters. Prokaryotic mortality due to viral infection was always higher than that due to bacterivores in the stations where both factors of prokaryotic mortality were measured. Viral infection accounted for all the prokaryotic heterotrophic production in Bellingshausen Sea and Gerlache Strait and for half of the prokaryotic heterotrophic production in Bransfield Strait. These high values of prokaryotic mortality due to viral infection are difficult to reconcile in nature, and more work is necessary to determine the mechanisms involved in the disappearance of viruses.</div></front></TEI><affiliations><list><country><li>Espagne</li></country><region><li>Catalogne</li></region></list><tree><country name="Espagne"><region name="Catalogne"><name sortKey="Guixa Boixereu, Nuria" sort="Guixa Boixereu, Nuria" uniqKey="Guixa Boixereu N" first="Nuria" last="Guixa-Boixereu">Nuria Guixa-Boixereu</name></region><name sortKey="Gasol, Josep M" sort="Gasol, Josep M" uniqKey="Gasol J" first="Josep M." last="Gasol">Josep M. Gasol</name><name sortKey="Pedros Alio, Carlos" sort="Pedros Alio, Carlos" uniqKey="Pedros Alio C" first="Carlos" last="Pedros-Alio">Carlos Pedros-Alio</name><name sortKey="Sanchez Camara, Jaime" sort="Sanchez Camara, Jaime" uniqKey="Sanchez Camara J" first="Jaime" last="Sanchez-Camara">Jaime Sanchez-Camara</name><name sortKey="Vaque, Dolors" sort="Vaque, Dolors" uniqKey="Vaque D" first="Dolors" last="Vaque">Dolors Vaque</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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