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Assessing Viral Abundance and Community Composition in Four Contrasting Regions of the Southern Ocean

AuthorsSotomayor Garcia, Ana; Sala, M. Montserrat CSIC ORCID ; Ferrera, Isabel CSIC ORCID; Estrada, Marta CSIC ORCID ; Vázquez-Domínguez, Evaristo CSIC ORCID; Emelianov, Mikhail CSIC ORCID ; Cortes, Pau CSIC ORCID; Marrasé, Cèlia CSIC ORCID ; Ortega-Retuerta, E. CSIC ORCID; Nunes, Sdena CSIC ORCID; Castillo, Yaiza CSIC ORCID ; Serrano Cuerva, María; Sebastián, Marta CSIC ORCID; Dall'Osto, Manuel CSIC ORCID ; Simó, Rafel CSIC ORCID ; Vaqué, Dolors CSIC ORCID
KeywordsViral abundance
Viral community composition
Environmental variables
Secondary metabolic compounds
Southern Ocean
Antarctic Ocean
Antarctic Peninsula
Issue DateJul-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationLife 10(7): 107 (2020)
AbstractWe explored how changes of viral abundance and community composition among four contrasting regions in the Southern Ocean relied on physicochemical and microbiological traits. During January–February 2015, we visited areas north and south of the South Orkney Islands (NSO and SSO) characterized by low temperature and salinity and high inorganic nutrient concentration, north of South Georgia Island (NSG) and west of Anvers Island (WA), which have relatively higher temperatures and lower inorganic nutrient concentrations. Surface viral abundance (VA) was highest in NSG (21.50 ± 10.70 × 106 viruses mL−1) and lowest in SSO (2.96 ± 1.48 × 106 viruses mL−1). VA was positively correlated with temperature, prokaryote abundance and prokaryotic heterotrophic production, chlorophyll a, diatoms, haptophytes, fluorescent organic matter, and isoprene concentration, and was negatively correlated with inorganic nutrients (NO3−, SiO42−, PO43−), and dimethyl sulfide (DMS) concentrations. Viral communities determined by randomly amplified polymorphic DNA–polymerase chain reaction (RAPD-PCR) were grouped according to the sampling location, being more similar within them than among regions. The first two axes of a canonical correspondence analysis, including physicochemical (temperature, salinity, inorganic nutrients—NO3−, SiO42−, and dimethyl sulfoniopropionate -DMSP- and isoprene concentrations) and microbiological (chlorophyll a, haptophytes and diatom, and prokaryote abundance and prokaryotic heterotrophic production) factors accounted for 62.9% of the variance. The first axis, temperature-related, accounted for 33.8%; the second one, salinity-related, accounted for 29.1%. Thus, different environmental situations likely select different hosts for viruses, leading to distinct viral communities
DescriptionSpecial issue Microbial Community Structure and Metabolic Networks in Polar Areas.-- 20 pages, 5 figures, 2 tables, supplementary material
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