Seasonal variability of recurrent phytoplankton pigment patterns in the Canary Islands area

Pacheco, Mercedes; Hernández‐Guerra, A.

doi:10.1080/014311699212795

Cited by 41 publications

(23 citation statements)

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“…These trajectories are generated all along the coast of the CANUS (Figure 11a), but more particularly between 258N and the Canary Islands. This region presents an enhanced eddy generation due to the unstable currents and winds [Ar ıstegui et al, 1994[Ar ıstegui et al, , 1997Barton et al, 1998;Pacheco and Hernandez-Guerra, 1999;Barton and Ar ıstegui, 2004;Sangr a et al, 2009]. In contrast, 40% of the sampled trajectories are associated with subsurface-intensified eddies showing significant maximum h 0 of 0.68C and S 0 of 0.12 around the pycnocline depth and extending down to 500 m depth (Figures 11f and 11g).…”

Section: Canary Upwelling System (Canus)mentioning

confidence: 99%

Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems

2015

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In the four major Eastern Boundary Upwelling Systems (EBUS), mesoscale eddies are known to modulate the biological productivity and transport near‐coastal seawater properties toward the offshore ocean, however little is known about their main characteristics and vertical structure. This study combines 10 years of satellite‐altimetry data and Argo float profiles of temperature and salinity, and our main goals are (i) to describe the main surface characteristics of long‐lived eddies formed in each EBUS and their evolution, and (ii) to depict the main vertical structure of the eddy‐types that coexist in these regions. A clustering analysis of the Argo profiles surfacing within the long‐lived eddies of each EBUS allows us to determine the proportion of surface and subsurface‐intensified eddies in each region, and to describe their vertical structure in terms of temperature, salinity and dynamic height anomalies. In the Peru‐Chile Upwelling System, 55% of the sampled anticyclonic eddies (AEs) have subsurface‐intensified maximum temperature and salinity anomalies below the seasonal pycnocline, whereas 88% of the cyclonic eddies (CEs) are surface‐intensified. In the California Upwelling System, only 30% of the AEs are subsurface‐intensified and all of the CEs show maximum anomalies above the pycnocline. In the Canary Upwelling System, ∼40% of the AEs and ∼60% of the CEs are subsurface‐intensified with maximum anomalies extending down to 800 m depth. Finally, the Benguela Upwelling System tends to generate ∼40–50% of weak surface‐intensified eddies and ∼50–60% of much stronger subsurface‐intensified eddies with a clear geographical distribution. The mechanisms involved in the observed eddy vertical shapes are discussed.

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Section: Canary Upwelling System (Canus)mentioning

confidence: 99%

Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems

2015

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“…Cyclonic and anticyclonic eddies are observed downstream of the Canary Islands during all seasons (Pacheco and Hernández-Guerra, 1999). Laboratory and numerical studies have indicated that the generation and shedding of eddies downstream an obstacle depends on the Reynolds number (Re) being higher than a critical value (Boyer, 1970;Boyer and Davies, 1982;Sangrá, 1995).…”

Section: Nacwmentioning

confidence: 99%

“…The mesoscale eddy field in the Canary Current is dominated by the presence of the Canary islands in the path of this current and the influence of the upwelling system off Northwest Africa (Hernández-Guerra et al, 1993;Arístegui et al, 1994;Arístegui et al, 1997;Barton et al, 1998;Pacheco and Hernández-Guerra, 1999;Barton et al, 2001). The presence of the islands generates cyclonic and anticyclonic eddies downstream the islands, and the influence of the upwelling system consists of upwelling filaments that are entrained into the main current.…”

Section: Introductionmentioning

confidence: 99%

Water masses, circulation and transport in the eastern boundary current of the North Atlantic subtropical gyre

Hernández‐Guerra¹,

López-Laatzen²,

Machín³

et al. 2001

Sci. Mar.

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“…The interaction between the Canary Current flowing through the islands, the coastal upwelling and Trade Winds creates an area of high mesoscale activity (Barton et al, 1998). Thus, warm wakes and eddies are generated south of the Islands (Arístegui et al, 1994;Sangrá et al, 2007), and upwelling filaments frequently reach the shores of the easternmost islands of the archipelago (La Violette, 1974;Pacheco and Hernández-Guerra, 1999). The influence of these mesoscale oceanographic structures on the ichthyoplankton off Gran Canaria Island was first described by Rodrí-guez et al (2001).…”

Section: Introductionmentioning

confidence: 99%

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

Hernández‐León

Moyano

2009

Sci. Mar.

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SUMMARY: Temporal and spatial variations of the larval fish community off the island of Gran Canaria (Canary Islands) were studied in weekly surveys from October 2005 to June 2006. A total of 156 taxa, belonging to 51 families and 15 orders, were identified. Myctophidae was by far the most abundant family (30%), followed by Sparidae (11%), Clupeidae (9%) and Gonostomatidae (7%). As expected for an oceanic island, neritic and oceanic taxa contributed in similar proportions. Leeward and windward retention areas were found for total egg and neritic larval abundance. However, seasonality showed a stronger influence on the annual larval assemblage than sampling site, as the latter was not significant on a long time scale. Results suggest that there are two seasonal larval assemblages corresponding to the two main characteristic periods of the water column in these waters: mixing (winter) and stratification (summer). In addition, a significant relationship was recorded between lunar illumination and small mesozooplankton biomass, suggesting that this relationship may be extended to certain neritic families. The most abundant neritic larvae (Sparidae) showed this lunar pattern, which partially supports a recent hypothesis about the effect of lunar illumination on larval fish survival and development in subtropical waters.Keywords: ichthyoplankton, larval assemblages, mesozooplankton, seasonal variation, lunar illumination. RESUMEN: VARIACIONES ESTACIONALES Y ESPACIALES DE LA COMUNIDAD DE LARVAS DE PECES DE GRAN CANARIA, ISLAS CANARIAS.-Se estudiaron las variaciones temporales y espaciales en la comunidad de larvas de peces de la isla de Gran Canaria (Islas Canarias) a partir de muestreos semanales desde octubre 2005 a junio 2006. Se identificaron un total de 156 taxones, pertenecientes a 51 familias y 15 órdenes. La familia Myctophidae fue la más abundante (30%), seguida por Sparidae (11%), Clupeidae (9%) y Gonostomatidae (7%). Como es de esperar en una isla oceánica, los taxones neríticos y oceánicos contribuyeron en proporciones similares. Se encontraron dos zonas de retención para huevos y larvas de especies neríticas, a sotavento y barlovento de la isla. Sin embargo, la estacionalidad mostró una mayor influencia en la estructura de la comunidad larvaria que la zona de muestreo, siendo ésta no significativa a largo plazo. Se observaron dos asociaciones estacionales de larvas correspondiendo con los dos períodos más característicos en la columna de agua: periodo de mezcla (invierno) y de estratificación (verano). Además, se encontró una relación significativa entre la iluminación lunar y la biomasa del zooplancton de pequeño tamaño, que podría ser extensible a las larvas neríticas. Las larvas neríticas más abundantes (Sparidae) mostraron una relación con el ciclo lunar, apoyando parcialmente una hipótesis reciente sobre el efecto de la iluminación lunar en la supervivencia larvaria y su desarrollo en aguas subtropicales.Palabras clave: ictioplancton, asociaciones de larvas, mesozooplancton, variaciones estacionales, ...

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Seasonal variability of recurrent phytoplankton pigment patterns in the Canary Islands area

Cited by 41 publications

References 0 publications

Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems

Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems

Water masses, circulation and transport in the eastern boundary current of the North Atlantic subtropical gyre

Temporal and along-shelf distribution of the larval fish assemblage at Gran Canaria, Canary Islands

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