Virioplankton Abundance in Trophic Gradients of an Upwelling Field

Pereira, G. C.; Granato, Alessandra; Figueiredo, A. R.; Ebecken, Nelson F. F.

doi:10.1590/s1517-83822009000400017

Cited by 12 publications

(10 citation statements)

References 44 publications

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“…These total abundance values of viruses enumerated in groundwater were similar to results obtained from other groundwater sites (Kyle et al, 2008; Roudnew et al, 2012). Virus abundance in this shallow aquifer was strongly correlated to cell abundance (ρ = 0.73, p < 0.001) (Figure 2C) and is consistent with prior studies comparing virus and cell abundance in aquatic and sedimentary environments including lakes (Maranger and Bird, 1995; Bettarel et al, 2006; de Araújo and Godinho, 2009; Barros et al, 2010), marine waters (Alonso et al, 2001; Pereira et al, 2009), marine surface sediments (Danovaro and Serresi, 2000), marine subsurface sediment (Bird et al, 2001; Engelhardt et al, 2014), and deep granitic groundwater (Kyle et al, 2008). The virus-to-microbial cell ratio (VMR) in this shallow aquifer ranged from 1.1 to 8.1 and averaged 3.0 ± 1.6 (mean ± S.D., n = 20; Figures 1C,F).…”

Section: Resultssupporting

confidence: 89%

Abundance and Distribution of Microbial Cells and Viruses in an Alluvial Aquifer

et al. 2017

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Viruses are the most abundant biological entity on Earth and their interactions with microbial communities are recognized to influence microbial ecology and impact biogeochemical cycling in various ecosystems. While the factors that control the distribution of viruses in surface aquatic environments are well-characterized, the abundance and distribution of continental subsurface viruses with respect to microbial abundance and biogeochemical parameters have not yet been established. In order to begin to understand the factors governing virus distribution in subsurface environments, we assessed microbial cell and virus abundance in groundwater concurrent with groundwater chemistry in a uranium impacted alluvial aquifer adjoining the Colorado River near Rifle, CO. Virus abundance ranged from 8.0 × 104 to 1.0 × 106 mL−1 and exceeded cell abundance in all samples (cell abundance ranged from 5.8 × 104 to 6.1 × 105 mL−1). The virus to microbial cell ratio ranged from 1.1 to 8.1 and averaged 3.0 ± 1.6 with virus abundance most strongly correlated to cell abundance (Spearman's ρ = 0.73, p < 0.001). Both viruses and cells were positively correlated to dissolved organic carbon (DOC) with cells having a slightly stronger correlation (Spearman's ρ = 0.46, p < 0.05 and ρ = 0.54, p < 0.05; respectively). Groundwater uranium was also strongly correlated with DOC and virus and cell abundance (Spearman's ρ = 0.62, p < 0.05; ρ = 0.46, p < 0.05; and ρ = 0.50, p < 0.05; respectively). Together the data indicate that microbial cell and virus abundance are correlated to the geochemical conditions in the aquifer. As such local geochemical conditions likely control microbial host cell abundance which in turn controls viral abundance. Given the potential impacts of viral-mediated cell lysis such as liberation of labile organic matter from lysed cells and changes in microbial community structure, viral interactions with the microbiota should be considered in an effort to understand subsurface biogeochemical cycling and contaminant mobility.

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Section: Resultssupporting

confidence: 89%

Abundance and Distribution of Microbial Cells and Viruses in an Alluvial Aquifer

et al. 2017

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“…As previously reported by [7], the highest mean value of virioplankton occurred in SACW while the highest mean values of prokaryotes, phytoplankton and meroplankton larvae occurred in the mixing of coastal and tropical waters. The cold water of SACW showed the smallest Het Prok/Phyto ratio and the highest virus/bacterial ratio (VBR) indicating a great viral activity.…”

Section: Resultssupporting

confidence: 84%

“…Many reports have described them along several environments [4][5][6][7]. The use of transmission electron microscopy (TEM) for aquatic virus investigation [8] was followed by the epifluorescence microscopy (EFM) along with the development of a variety of highly fluorescent nucleic acid dyes [9].…”

Section: Introductionmentioning

confidence: 99%

Genetic Optimization of Artificial Neural Networks to Forecast Virioplankton Abundance from Cytometric Data

Pereira¹,

Oliveira²,

Ebecken³

2013

JILSA

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Since viruses are able to influence the trophic status and community structure they should be accessed and accounted in ecosystem functioning and management models. So, this work met a set of biological, chemical and physical time series in order to explore the correlations with marine virioplankton community across different trophic gradients. The case studied is the Arraial do Cabo upwelling system, northeast of Rio de Janeiro State in Southeast coast of Brazil. The main goal is to evolve three type of artificial neural network (ANN) by genetic algorithm (GA) optimization to predict virioplankton abundance and dynamic. The input variables range from the abundance of phytoplankton, bacterioplankton and its ratios acquired by one in situ and another ex situ flow cytometers. These data were collected with weekly frequency from August 2006 to June 2007. Our results show viruses being highly correlated to their host, and that GA provided an efficient method of optimizing ANN architectures to predict the virioplankton abundance. The RBF-NN model presented the best performance to an accuracy of 97% for any period in the year. A discussion and ecological interpretations about the system behavior is also provided.

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“…Heterotrophic bacterioplankton is important in inducing primary production, recycling compounds produced by autotrophic organisms and consuming organic material (CARVALHO; YOSHINAGA et al, 2008;PEREIRA et al, 2009b). Heterotrophic bacterial activity did not change during upwelling (spring/summer) and subsidence (autumn/winter) seasons.…”

Section: Physical-biological Interactions: Ecological Consequences Ofmentioning

confidence: 99%

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

et al. 2012

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A B S T R A C TThe rising of cold water from deeper levels characterizes coastal upwelling systems. This flow makes nutrients available in the euphotic layer, which enhances phytoplankton production and growth. On the Brazilian coast, upwelling is most intense in the Cabo Frio region (RJ). The basic knowledge of this system was reviewed in accordance with concepts of biophysical interactions. The high frequency and amplitude of the prevailing winds are the main factor promoting the rise of South Atlantic Central Water, but meanders and eddies in the Brazil Current as well as local topography and coast line are also important. Upwelling events are common during spring/summer seasons. Primary biomass is exported by virtue of the water circulation and is also controlled by rapid zooplankton predation. Small pelagic fish regulate plankton growth and in their turn are preyed on by predatory fish. Sardine furnishes an important regional fish stock. Shoreline irregularities define the embayment formation of the Marine Extractive Reserve of Arraial do Cabo making it an area with evident different intensities of upwelled water that harbors high species diversity. Consequently, on a small spatial scale there are environments with tropical and subtropical features, a point to be explored as a particularity of this ecosystem. R E S U M OOs sistemas costeiros de ressurgência são caracterizados pela ascensão de águas frias que tornam os nutrientes disponíveis na camada eufótica para o crescimento e aumento da produção fitoplanctônica. No Brasil, a região do Cabo Frio (RJ) é o principal sistema de ressurgência costeira. O objetivo desse artigo foi revisar o atual conhecimento desse sistema através dos conceitos sobre interações biofísicas. A ascensão da Água Central do Atlântico Sul ocorre devido à alta frequência e amplitude dos ventos, à presença de meandros e vórtices na Corrente do Brasil, além da topografia local e da linha de costa. Os eventos de ressurgência são comuns durante os períodos de primavera/verão e a biomassa primária é exportada devido à circulação da água, sendo também controlada pela rápida predação zooplanctônica. Os pequenos peixes pelágicos regulam o crescimento do plâncton e são consumidos pelos peixes predadores, resultando em um importante estoque pesqueiro regional. A irregularidade da costa define as enseadas do Cabo Frio, na Reserva Extrativista Marinha do Arraial do Cabo, apresentando distintas influências das águas ressurgidas e resultando em grande diversidade de espécies. Consequentemente, ambientes com características tropicais e subtropicais são observados dentro de uma pequena escala espacial, o que constitui uma particularidade desse ecossistema.

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Virioplankton Abundance in Trophic Gradients of an Upwelling Field

Cited by 12 publications

References 44 publications

Abundance and Distribution of Microbial Cells and Viruses in an Alluvial Aquifer

Abundance and Distribution of Microbial Cells and Viruses in an Alluvial Aquifer

Genetic Optimization of Artificial Neural Networks to Forecast Virioplankton Abundance from Cytometric Data

Biophysical interactions in the Cabo Frio upwelling system, southeastern Brazil

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