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Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship.
Viruses. 2017 04 20; 9(4)V

Abstract

Viruses influence the ecology and diversity of phytoplankton in the ocean. Most studies of phytoplankton host-virus interactions have focused on bloom-forming species like Emiliania huxleyi or Phaeocystis spp. The role of viruses infecting phytoplankton that do not form conspicuous blooms have received less attention. Here we explore the dynamics of phytoplankton and algal viruses over several sequential seasons, with a focus on the ubiquitous and diverse phytoplankton division Haptophyta, and their double-stranded DNA viruses, potentially with the capacity to infect the haptophytes. Viral and phytoplankton abundance and diversity showed recurrent seasonal changes, mainly explained by hydrographic conditions. By 454 tag-sequencing we revealed 93 unique haptophyte operational taxonomic units (OTUs), with seasonal changes in abundance. Sixty-one unique viral OTUs, representing Megaviridae and Phycodnaviridae, showed only distant relationship with currently isolated algal viruses. Haptophyte and virus community composition and diversity varied substantially throughout the year, but in an uncoordinated manner. A minority of the viral OTUs were highly abundant at specific time-points, indicating a boom-bust relationship with their host. Most of the viral OTUs were very persistent, which may represent viruses that coexist with their hosts, or able to exploit several host species.

Authors+Show Affiliations

Vaxxinova Norway AS, Kong Christian Frederiks plass 3, 5006 Bergen, Norway. torillvjohannessen@gmail.com.Uni Research Environment, N-5008 Bergen, Norway. aud.larsen@bio.uib.no.Department of Biology, University of Bergen, N-5020 Bergen, Norway. gunnar.bratbak@bio.uib.no.Department of Biology, University of Bergen, N-5020 Bergen, Norway. antonio.pagarete@uib.no.Department of Biosciences, University of Oslo, 0316 Oslo, Norway. bente.edvardsen@ibv.uio.no.Department of Biosciences, University of Oslo, 0316 Oslo, Norway. elianne.egge@gmail.com.Department of Biology, University of Bergen, N-5020 Bergen, Norway. ruth.sandaa@bio.uib.no.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

28425942

Citation

Johannessen, Torill Vik, et al. "Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship." Viruses, vol. 9, no. 4, 2017.
Johannessen TV, Larsen A, Bratbak G, et al. Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship. Viruses. 2017;9(4).
Johannessen, T. V., Larsen, A., Bratbak, G., Pagarete, A., Edvardsen, B., Egge, E. D., & Sandaa, R. A. (2017). Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship. Viruses, 9(4). https://doi.org/10.3390/v9040084
Johannessen TV, et al. Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship. Viruses. 2017 04 20;9(4) PubMed PMID: 28425942.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Seasonal Dynamics of Haptophytes and dsDNA Algal Viruses Suggest Complex Virus-Host Relationship. AU - Johannessen,Torill Vik, AU - Larsen,Aud, AU - Bratbak,Gunnar, AU - Pagarete,António, AU - Edvardsen,Bente, AU - Egge,Elianne D, AU - Sandaa,Ruth-Anne, Y1 - 2017/04/20/ PY - 2017/01/31/received PY - 2017/04/06/revised PY - 2017/04/13/accepted PY - 2017/4/21/entrez PY - 2017/4/21/pubmed PY - 2018/1/11/medline KW - Haptophyta KW - Megaviridae KW - Phycodnaviridae KW - marine viral ecology KW - metagenomics KW - viral–host interactions JF - Viruses JO - Viruses VL - 9 IS - 4 N2 - Viruses influence the ecology and diversity of phytoplankton in the ocean. Most studies of phytoplankton host-virus interactions have focused on bloom-forming species like Emiliania huxleyi or Phaeocystis spp. The role of viruses infecting phytoplankton that do not form conspicuous blooms have received less attention. Here we explore the dynamics of phytoplankton and algal viruses over several sequential seasons, with a focus on the ubiquitous and diverse phytoplankton division Haptophyta, and their double-stranded DNA viruses, potentially with the capacity to infect the haptophytes. Viral and phytoplankton abundance and diversity showed recurrent seasonal changes, mainly explained by hydrographic conditions. By 454 tag-sequencing we revealed 93 unique haptophyte operational taxonomic units (OTUs), with seasonal changes in abundance. Sixty-one unique viral OTUs, representing Megaviridae and Phycodnaviridae, showed only distant relationship with currently isolated algal viruses. Haptophyte and virus community composition and diversity varied substantially throughout the year, but in an uncoordinated manner. A minority of the viral OTUs were highly abundant at specific time-points, indicating a boom-bust relationship with their host. Most of the viral OTUs were very persistent, which may represent viruses that coexist with their hosts, or able to exploit several host species. SN - 1999-4915 UR - https://www.unboundmedicine.com/medline/citation/28425942/Seasonal_Dynamics_of_Haptophytes_and_dsDNA_Algal_Viruses_Suggest_Complex_Virus_Host_Relationship_ L2 - https://www.mdpi.com/resolver?pii=v9040084 DB - PRIME DP - Unbound Medicine ER -