Efectos microbiológicos producidos por un evento de surgencia costera en Chile central

Kuznar, Juan; Espinoza, Juan Carlos; Avaria, Sergio; Valenzuela, María José; Pavez, Camila; Egaña, M Juan Ignacio

doi:10.4067/s0718-19572009000100019

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…In contrast, despite the low VPR average observed off Concepción, the values ranged from 0.25 to 45.73, indicating a high viruses and prokaryotes dynamic and that during upwelling conditions VPR values were in fact higher (Eissler et al, 2010 ). In addition, Wommack and Colwell ( 2000 ) indicated that VPR values generally vary between 3 and 10, and that higher values are associated with highly productive environments (Wommack and Colwell, 2000 ; Weinbauer, 2004 ; Parikka et al, 2016 ), which has been also associated with upwelling environments of the Eastern Pacific (Kuznar et al, 2009 ; Letelier et al, 2009 ; Eissler et al, 2010 ). In two of these areas (Chiang and Quiñones, 2007 ; Carreira et al, 2020 ) nutrient availability was relatively low, especially in the Great Barrier Reef (Carreira et al, 2020 ).…”

Section: Discussionmentioning

confidence: 99%

“…To support the aforementioned, an increase in VPR values has been related to the trophic gradient, finding higher values in nutrient-rich environments (Wommack and Colwell, 2000 ; Parikka et al, 2016 ). In marine environments, the high concentration of organic substrates and nutrients such as during upwelling seasons, favors the rapid development of prokaryotic communities, in turn, favoring a higher viral dynamic (Culley and Welschmeyer, 2002 ; Kuznar et al, 2009 ; Eissler et al, 2010 ). Conversely, it has been determined that the unavailability of nutrients results in a decrease in the VPR values in oligotrophic environments (Wommack and Colwell, 2000 ; Parikka et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…In this EBUS area, VPR values have been shown to decrease from the surface and then increase again in the sub-oxic or anoxic subsurface layer (Taylor et al, 2003 ; Chiang and Quiñones, 2007 ). High VPR values have been registered in coastal bay areas at EBUS (Kuznar et al, 2009 ; Eissler et al, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

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Virus-to-prokaryote ratio in the Salar de Huasco and different ecosystems of the Southern hemisphere and its relationship with physicochemical and biological parameters

Eissler

Castillo-Reyes²,

Dorador³

et al. 2022

Front. Microbiol.

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The virus-to-prokaryote ratio (VPR) has been used in many ecosystems to study the relationship between viruses and their hosts. While high VPR values indicate a high rate of prokaryotes' cell lysis, low values are interpreted as a decrease in or absence of viral activity. Salar de Huasco is a high-altitude wetland characterized by a rich microbial diversity associated with aquatic sites like springs, ponds, streams and a lagoon with variable physicochemical conditions. Samples from two ponds, Poza Rosada (PR) and Poza Verde (PV), were analyzed by epifluorescence microscopy to determine variability of viral and prokaryotic abundance and to calculate the VPR in a dry season. In addition, to put Salar de Huasco results into perspective, a compilation of research articles on viral and prokaryotic abundance, VPR, and metadata from various Southern hemisphere ecosystems was revised. The ecosystems were grouped into six categories: high-altitude wetlands, Pacific, Atlantic, Indian, and Southern Oceans and Antarctic lakes. Salar de Huasco ponds recorded similar VPR values (an average of 7.4 and 1.7 at PR and PV, respectively), ranging from 3.22 to 15.99 in PR. The VPR variability was associated with VA and chlorophyll a, when considering all data available for this ecosystem. In general, high-altitude wetlands recorded the highest VPR average (53.22 ± 95.09), followed by the Oceans, Southern (21.91 ± 25.72), Atlantic (19.57 ± 15.77) and Indian (13.43 ± 16.12), then Antarctic lakes (11.37 ± 15.82) and the Pacific Ocean (6.34 ± 3.79). Physicochemical variables, i.e., temperature, conductivity, nutrients (nitrate, ammonium, and phosphate) and chlorophyll a as a biological variable, were found to drive the VPR in the ecosystems analyzed. Thus, the viral activity in the Wetland followed similar trends of previous reports based on larger sets of metadata analyses. In total, this study highlights the importance of including viruses as a biological variable to study microbial temporal dynamics in wetlands considering their crucial role in the carbon budgets of these understudied ecosystems in the southern hemisphere.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Virus-to-prokaryote ratio in the Salar de Huasco and different ecosystems of the Southern hemisphere and its relationship with physicochemical and biological parameters

Eissler

Castillo-Reyes²,

Dorador³

et al. 2022

Front. Microbiol.

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Wind forcing and short-term variability of phytoplankton and heterotrophic bacterioplankton in the coastal zone of the Concepción upwelling system (Central Chile)

Daneri

Lizárraga

Montero

et al. 2012

Progress in Oceanography

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Bacteriological water quality of recirculating aquatic systems for maintenance of yellowtail amberjack Seriola lalandi

Garcia‐Mendoza

Cáceres-Martı́nez

Vásquez‐Yeomans

et al. 2019

J World Aquaculture Soc

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The bacteriological water quality associated with marine fish farming systems can be a determining factor in the development of disease, and understanding this quality is fundamental for the prevention and control of possible disease outbreaks. In the present study, the bacteriological water quality of a yellowtail amberjack Seriola lalandi broodstock maintenance system, composed of two units of a recirculation aquaculture system (RAS 1 and RAS 2), was determined. From February 2016 to January 2017, monthly samples of surface water were taken at six points in the two RAS systems: (a) from the water reception tank and (b) from filter 1 and (c) tank 1 (in RAS 1) and (d) filter 2 and (e) tank 2 (in RAS 2) and from a joint (f) discharge point. The bacteriological quality was determined by counting total heterotrophic bacteria (THB) and by molecular identification (16S rRNA gene). The number of THB showed a tendency to decrease in filters 1 and 2, to increase in tanks 1 and 2, and again increase in the discharge. The fluctuation of THB, in general, was from 1.0 × 103 to 2.9 × 105 CFU/mL. In total, 102 colonies were isolated, corresponding to nine orders and 52 species, and Vibrionales and Alteromonadales were the most abundant orders. The bacterium Vibrio harveyi, a pathogen of S. lalandi, was identified, as were other bacterial species that are known pathogens; however, no signs of disease or mortality events were recorded during the study. These results suggest that the bacterial community contributed to the maintenance of a balance in the RAS, which prevented the development of infectious diseases. Furthermore, the physicochemical parameters (temperature, oxygen, nitrogen compounds, and alkalinity) were maintained within the optimum range required by S. lalandi. Some zoonotic bacteria were found, as well as bacteria with probiotic and industrial uses. These results represent the first report on bacteriological quality in RAS for S. lalandi.

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Efectos microbiológicos producidos por un evento de surgencia costera en Chile central

Cited by 3 publications

References 18 publications

Virus-to-prokaryote ratio in the Salar de Huasco and different ecosystems of the Southern hemisphere and its relationship with physicochemical and biological parameters

Virus-to-prokaryote ratio in the Salar de Huasco and different ecosystems of the Southern hemisphere and its relationship with physicochemical and biological parameters

Wind forcing and short-term variability of phytoplankton and heterotrophic bacterioplankton in the coastal zone of the Concepción upwelling system (Central Chile)

Bacteriological water quality of recirculating aquatic systems for maintenance of yellowtail amberjack Seriola lalandi

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