Relationship between phytoplankton production and the physical structure of the water column near Cobb Seamount, northeast Pacific

Comeau, Luc A.; Vézina, Alain F.; Bourgeois, Myriam; Juniper, S. Kim

doi:10.1016/0967-0637(95)00050-g

Cited by 58 publications

(39 citation statements)

References 24 publications

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“…In a fixed position, internal waves may expose autotroph bacteria to highly variable light intensities. Reference [30] made similar assumptions regarding light intensification due to the lift of the pycnocline and the associated chloro-phyll maximu m at Cobb Seamount in the Northeast Pacific. Since equatorial tidal currents are stronger and the potential for internal waves action against the slopes is great one may expect similar p rocesses may account for the horizontal differences of chlorophyll concentrations near seamounts and slopes along the FNR.…”

Section: Discussionmentioning

confidence: 99%

Deep Chlorophyll Maximum in Western Equatorial Atlantic - How does it Interact with Islands Slopes and Seamounts?

Cordeiro¹,

Brandini²,

Rosa³

et al. 2013

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This paper investigates the dynamics of the deep chlorophyll maximu m layer (DCM L) along the Fernando de Noronha Ridge in the oligotrophic western equatorial Atlantic off northeast Brazil. M ixing processes between water masses above and below the thermocline may occur in a scale of tens of meters around the 24.5 to 25.5 isopycnals, where photoautotrophs are concentrate at the bottom of the euphotic zone. The primary production at the DCM L can provide 210 (±170) metric tons of Carbon per day to the benthic community at the Rocas atoll. The behavior of isopycnals in deeper and strongly stratified waters suggest that internal waves may imp rove primary production, by lift ing the deeper and nutrient-rich South Atlantic Central Water upwards and carrying the autotrophs to brighter depths.

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Section: Discussionmentioning

confidence: 99%

Deep Chlorophyll Maximum in Western Equatorial Atlantic - How does it Interact with Islands Slopes and Seamounts?

Cordeiro¹,

Brandini²,

Rosa³

et al. 2013

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“…Modeling suggests that such a circulation cell may extend no more than a few hundred meters above a summit. The verticalradial circulation cell is connected (e.g., Lavelle, 2006) to a hydrographic feature called the cold dome, the often observed upward bowing above the seamount summit of time-averaged isotherms with respect to isotherms in the surrounding ocean (e.g., Owens and Hogg, 1980;Roden, 1987;Comeau et al, 1995). Below cold dome depths, isopycnals (i.e., contours of equal density) may plunge where they meet seamount flanks (e.g., Lavelle, 2006;de Steur et al, 2007).…”

Section: Vertical Circulation and The Cold Domementioning

confidence: 99%

Motion, Commotion, and Biophysical Connections at Deep Ocean Seamounts

Lavelle¹,

Mohn²

2010

Oceanog.

117

100

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“…However, increased levels of phytoplanktonic biomass and productivity were found in areas influenced by seamounts (e.g. Comeau et al, 1995) and therefore it is possible that primary productivity could be enhanced on the Bajo O'Higgins 1 seamount in some periods of the year. In fact, the high fishery activity on species such as Orange Roughy (Hoplostethus atlanticus) and Alfonsino (Beryx splendens), which concentrate on this seamount (Young et al, 2000), suggests that the seamount's topography may influence biological and oceanographic processes, therefore enhancing biological productivity.…”

Section: Discussionmentioning

confidence: 99%

Relationship between viral and prokaryotic abundance on the Bajo O’Higgins 1 Seamount (Humboldt Current System off Chile)

Quiñones¹

2007

Sci. Mar.

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SUMMARY: There is little known about the ecology of microbial communities living in the water column over seamounts. Here, for the first time, the spatial distribution and abundance of virus-like particles (VLP) are described over a seamount. The association between VLP distribution, prokaryotic abundance, and environmental variables is also analyzed. Sampling was conducted in December 2004 on the Bajo O'Higgins 1 seamount (32°54'S, 73°53'W) located in the Humboldt Current System off Chile. A oxygen minimum layer (OMZ) was clearly present between 130 and 280 m in the water column over the seamount. Water samples were taken with Niskin bottles at 10 oceanographic stations over the seamount at depths of 5, 20, 50, 75, 100, and 150 m and at the benthic boundary layer (BBL; 5-12 m over the sediments). Temperature, salinity, oxygen, chlorophyll a, and phaeopigments were measured at each station. Viral and prokaryotic abundances were determined with fluorochrome SYBR Green I. Viral abundance ranged from 1.53 x 10 9 VLP L -1 -16.48 x 10 9 VLP L -1 , whereas prokaryotic abundance ranged from 1.78 x 10 8 cell L -1 -14.91 x 10 8 cell L -1 . The virus-like particle/prokaryote ratio varied widely among the analyzed layers (i.e. surface, OMZ, and BBL), probably due to the presence of different prokaryotic and viral assemblages in each layer. Our results indicate that the environmental conditions, mainly the concentration of dissolved oxygen in the water column over Bajo O'Higgins 1 seamount, shape the association between viral and prokaryotic abundance.Keywords: virus-like particles, prokaryotes, seamount, oxygen minimum zone, benthic boundary layer, Humboldt Current System. RESUMEN: RELACIÓN ENTRE LA ABUNDANCIA VIRAL Y PROCARIÓTICA SOBRE EL MONTE SUBMARINO BAJO O'HIGGINS 1 (SISTEMA DE LA CORRIENTE DE HUMBOLDT FRENTE A CHILE). -La ecología de comunidades microbianas que habitan en la columna de agua sobre montes submarinos es escasamente conocida. Aquí, por primera vez, se describe la distribución y abundancia de partículas virales (VLP) sobre un monte submarino. La asociación entre la distribución de VLP, abundancia de procariotas y variables ambientales es también analizada. El muestreo fue realizado en Diciembre del 2004 sobre el monte submarino Bajo O'Higgins 1 (32°54'S, 73°53'W) localizado en el Sistema de la Corriente de Humboldt frente a Chile. Una zona de mínimo oxígeno se detectó entre 130 y 280 m en la columna de agua sobre el monte submarino. Las muestras de agua fueron tomadas con botellas Niskin desde 10 estaciones oceanográficas a 5, 20, 50, 75, 100, y 150 m de profundidad y en la capa de interfase bentónica (BBL; 5-12 m sobre el sedimento). Las variables temperatura, salinidad, oxígeno, clorofila a y feopigmentos fueron medidas en cada estación. La abundancia de virus y procariotas se determinó utilizando el fluorocromo SYBR Green I. La abundancia viral varió entre 1.53 x 10 9 VLP L -1 -16.48 x 10 9 VLP L -1 , mientras que la abundancia de células procariotas lo hizo entre 1.78 x 10 8 células L -1 -14.91 x 10 ...

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Relationship between phytoplankton production and the physical structure of the water column near Cobb Seamount, northeast Pacific

Cited by 58 publications

References 24 publications

Deep Chlorophyll Maximum in Western Equatorial Atlantic - How does it Interact with Islands Slopes and Seamounts?

Deep Chlorophyll Maximum in Western Equatorial Atlantic - How does it Interact with Islands Slopes and Seamounts?

Motion, Commotion, and Biophysical Connections at Deep Ocean Seamounts

Relationship between viral and prokaryotic abundance on the Bajo O’Higgins 1 Seamount (Humboldt Current System off Chile)

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