Viruses and Protists Induced-mortality of Prokaryotes around the Antarctic Peninsula during the Austral Summer

Handle URI:
http://hdl.handle.net/10754/623117
Title:
Viruses and Protists Induced-mortality of Prokaryotes around the Antarctic Peninsula during the Austral Summer
Authors:
Vaque, Dolors; Boras, Julia A.; Torrent-Llagostera, Francesc; Agusti, Susana ( 0000-0003-0536-7293 ) ; Arrieta, Jesus ( 0000-0002-0190-6950 ) ; Lara, Elena; Castillo, Yaiza M.; Duarte, Carlos M. ( 0000-0002-1213-1361 ) ; Sala, Maria M.
Abstract:
During the Austral summer 2009 we studied three areas surrounding the Antarctic Peninsula: the Bellingshausen Sea, the Bransfield Strait and the Weddell Sea. We aimed to investigate, whether viruses or protists were the main agents inducing prokaryotic mortality rates, and the sensitivity to temperature of prokaryotic heterotrophic production and mortality based on the activation energy (Ea) for each process. Seawater samples were taken at seven depths (0.1-100 m) to quantify viruses, prokaryotes and protists abundances, and heterotrophic prokaryotic production (PHP). Viral lytic production, lysogeny, and mortality rates of prokaryotes due to viruses and protists were estimated at surface (0.1-1 m) and at the Deep Fluorescence Maximum (DFM, 12-55 m) at eight representative stations of the three areas. The average viral lytic production ranged from 1.0 +/- 0.3 x 10(7) viruses ml(-1) d(-1) in the Bellingshausen Sea to1.3 +/- 0.7 x 10(7) viruses ml(-1) d(-1) in the Bransfield Strait, while lysogeny, when detectable, recorded the lowest value in the Bellingshausen Sea (0.05 +/- 0.05 x 10(7) viruses ml(-1) d(-1)) and the highest in the Weddell Sea (4.3 +/- 3.5 x 10(7) viruses ml(-1) d(-1)). Average mortality rates due to viruses ranged from 9.7 +/- 6.1 x 10(4) cells ml(-1) d(-1) in the Weddell Sea to 14.3 +/- 4.0 x 10(4) cells ml(-1) d(-1) in the Bellingshausen Sea, and were higher than averaged grazing rates in the Weddell Sea (5.9 +/- 1.1 x 10(4) cells ml(-1) d(-1)) and in the Bellingshausen Sea (6.8 +/- 0.9 x 10(4) cells ml-1 d(-1)). The highest impact on prokaryotes by viruses and main differences between viral and protists activities were observed in surface samples: 17.8 +/- 6.8 x 10(4) cells ml(-1) d(-1) and 6.5 +/- 3.9 x 10(4) cells ml(-1) d(-1) in the Weddell Sea; 22.1 +/- 9.6 x 10(4) cells ml(-1) d(-1) and 11.6 +/- 1.4 x 10(4) cells ml(-1) d(-1) in the Bransfield Strait; and 16.1 +/- 5.7 x 10(4) cells ml(-1) d(-1) and 7.9 +/- 2.6 x 10(4) cells ml(-1) d(-1) in the Bellingshausen Sea, respectively. Furthermore, the rate of lysed cells and PHP showed higher sensitivity to temperature than grazing rates by protists. We conclude that viruses were more important mortality agents than protists mainly in surface waters and that viral activity has a higher sensitivity to temperature than grazing rates. This suggests a reduction of the carbon transferred through the microbial food-web that could have implications in the biogeochemical cycles in a future warmer ocean scenario.
KAUST Department:
King Abdullah University of Sciences and Technology, Thuwal, Saudi Arabia
Citation:
Vaqué D, Boras JA, Torrent-Llagostera F, Agustí S, Arrieta JM, et al. (2017) Viruses and Protists Induced-mortality of Prokaryotes around the Antarctic Peninsula during the Austral Summer. Frontiers in Microbiology 8. Available: http://dx.doi.org/10.3389/fmicb.2017.00241.
Publisher:
Frontiers Media SA
Journal:
Frontiers in Microbiology
Issue Date:
27-Mar-2017
DOI:
10.3389/fmicb.2017.00241
Type:
Article
ISSN:
1664-302X
Sponsors:
This study was supported by the following projects: ATOS (POL2006-00550/CTM, P.I.: CD.) funded by the Spanish Ministerio de Ciencia e Innovacion, YC work was supported by a Ph.D. fellowship from the MINECO (FPI grant).
Additional Links:
http://journal.frontiersin.org/article/10.3389/fmicb.2017.00241/full
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Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorVaque, Dolorsen
dc.contributor.authorBoras, Julia A.en
dc.contributor.authorTorrent-Llagostera, Francescen
dc.contributor.authorAgusti, Susanaen
dc.contributor.authorArrieta, Jesusen
dc.contributor.authorLara, Elenaen
dc.contributor.authorCastillo, Yaiza M.en
dc.contributor.authorDuarte, Carlos M.en
dc.contributor.authorSala, Maria M.en
dc.date.accessioned2017-04-10T07:49:52Z-
dc.date.available2017-04-10T07:49:52Z-
dc.date.issued2017-03-27en
dc.identifier.citationVaqué D, Boras JA, Torrent-Llagostera F, Agustí S, Arrieta JM, et al. (2017) Viruses and Protists Induced-mortality of Prokaryotes around the Antarctic Peninsula during the Austral Summer. Frontiers in Microbiology 8. Available: http://dx.doi.org/10.3389/fmicb.2017.00241.en
dc.identifier.issn1664-302Xen
dc.identifier.doi10.3389/fmicb.2017.00241en
dc.identifier.urihttp://hdl.handle.net/10754/623117-
dc.description.abstractDuring the Austral summer 2009 we studied three areas surrounding the Antarctic Peninsula: the Bellingshausen Sea, the Bransfield Strait and the Weddell Sea. We aimed to investigate, whether viruses or protists were the main agents inducing prokaryotic mortality rates, and the sensitivity to temperature of prokaryotic heterotrophic production and mortality based on the activation energy (Ea) for each process. Seawater samples were taken at seven depths (0.1-100 m) to quantify viruses, prokaryotes and protists abundances, and heterotrophic prokaryotic production (PHP). Viral lytic production, lysogeny, and mortality rates of prokaryotes due to viruses and protists were estimated at surface (0.1-1 m) and at the Deep Fluorescence Maximum (DFM, 12-55 m) at eight representative stations of the three areas. The average viral lytic production ranged from 1.0 +/- 0.3 x 10(7) viruses ml(-1) d(-1) in the Bellingshausen Sea to1.3 +/- 0.7 x 10(7) viruses ml(-1) d(-1) in the Bransfield Strait, while lysogeny, when detectable, recorded the lowest value in the Bellingshausen Sea (0.05 +/- 0.05 x 10(7) viruses ml(-1) d(-1)) and the highest in the Weddell Sea (4.3 +/- 3.5 x 10(7) viruses ml(-1) d(-1)). Average mortality rates due to viruses ranged from 9.7 +/- 6.1 x 10(4) cells ml(-1) d(-1) in the Weddell Sea to 14.3 +/- 4.0 x 10(4) cells ml(-1) d(-1) in the Bellingshausen Sea, and were higher than averaged grazing rates in the Weddell Sea (5.9 +/- 1.1 x 10(4) cells ml(-1) d(-1)) and in the Bellingshausen Sea (6.8 +/- 0.9 x 10(4) cells ml-1 d(-1)). The highest impact on prokaryotes by viruses and main differences between viral and protists activities were observed in surface samples: 17.8 +/- 6.8 x 10(4) cells ml(-1) d(-1) and 6.5 +/- 3.9 x 10(4) cells ml(-1) d(-1) in the Weddell Sea; 22.1 +/- 9.6 x 10(4) cells ml(-1) d(-1) and 11.6 +/- 1.4 x 10(4) cells ml(-1) d(-1) in the Bransfield Strait; and 16.1 +/- 5.7 x 10(4) cells ml(-1) d(-1) and 7.9 +/- 2.6 x 10(4) cells ml(-1) d(-1) in the Bellingshausen Sea, respectively. Furthermore, the rate of lysed cells and PHP showed higher sensitivity to temperature than grazing rates by protists. We conclude that viruses were more important mortality agents than protists mainly in surface waters and that viral activity has a higher sensitivity to temperature than grazing rates. This suggests a reduction of the carbon transferred through the microbial food-web that could have implications in the biogeochemical cycles in a future warmer ocean scenario.en
dc.description.sponsorshipThis study was supported by the following projects: ATOS (POL2006-00550/CTM, P.I.: CD.) funded by the Spanish Ministerio de Ciencia e Innovacion, YC work was supported by a Ph.D. fellowship from the MINECO (FPI grant).en
dc.publisherFrontiers Media SAen
dc.relation.urlhttp://journal.frontiersin.org/article/10.3389/fmicb.2017.00241/fullen
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectvirusesen
dc.subjectprokaryotesen
dc.subjectprotistsen
dc.subjectlysisen
dc.subjectlysogenyen
dc.subjectmortalityen
dc.subjecttemperatureen
dc.subjectAntarctic watersen
dc.titleViruses and Protists Induced-mortality of Prokaryotes around the Antarctic Peninsula during the Austral Summeren
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Sciences and Technology, Thuwal, Saudi Arabiaen
dc.identifier.journalFrontiers in Microbiologyen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionInstitut de Ciències del Mar (CSIC), Consejo Superior de Investigaciones Científicas, Barcelona, Spainen
dc.contributor.institutionInstitute of Marine Sciences (CNR-ISMAR), National Research Council, Venezia, Italyen
kaust.authorAgusti, Susanaen
kaust.authorArrieta, Jesusen
kaust.authorDuarte, Carlos M.en
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