Water mass circulation on the continental shelf of the Gulf of Cádiz

García‐Lafuente, Jesús; Delgado, Javier; Criado-Aldeanueva, Francisco; Bruno, Miguel; Río, Jorge Del; Vargas, J. Mario

doi:10.1016/j.dsr2.2006.04.011

Cited by 155 publications

(130 citation statements)

References 20 publications

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“…As previously discussed by several authors (Garcia-Lafuente et al 2006), during our study year we observed the highest temperatures in summer and the coldest waters in winter, with significant differences between cruises (t-test, p<0.01) (Fig. 2), and extreme values recorded close to the Guadalquivir River.…”

Section: Spatial and Seasonal Distribution Of Chl-a And Cyanobacteriasupporting

confidence: 66%

Seasonal evolution of cholorophyll-a and cyanobacteria (Prochlorococcus and Synechococcus) on the northeast continental shelf of the Gulf of Cádiz: relation to thermohaline and nutrients fields

Anfuso¹,

Debelius²,

Castro³

et al. 2013

Sci. Mar.

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SUMMARY:The seasonal evolution of nutrients, chlorophyll-a (chl-a) and cyanobacteria (Synechococcus and Prochlorococcus) on the northeast continental shelf of the Gulf of Cádiz was observed during four cruises in summer and autumn 2006 and winter and spring 2007. Samples were collected to determine the distribution of chl-a and cyanobacteria abundance and to analyse their coupling with thermohaline and chemical properties in the gulf region. Surface nutrient distributions showed clear seasonal variability. Maximum levels were recorded for the entire study region during winter due to winter mixing and the strong influence of the Guadalquivir River and Bay of Cádiz outflow. Maximum chl-a levels were reached during spring for the entire region and for the entire water column. Minimum values of chl-a were observed during summer, under prevailing oligotrophic conditions, and winter when in spite of relatively high nutrient concentrations, phytoplankton growth was probably light-limited. The distribution of both cyanobacteria populations also varied seasonally in association with the oceanographic conditions. Prochlorococcus maximum cell abundance was observed at the sea surface during the four cruises, except in the northern region during summer. However, Synechococcus showed a maximum concentration at the sea surface in autumn and winter and at the subsurface chlorophyll maximum in autumn and spring.Keywords: chlorophyll-a, cyanobacteria, seasonal evolution, Guadalquivir River, Gulf of Cádiz.RESUMEN: Evolución Estacional dE clorofila-a, y cianobactEria (Prochlorococcus y synechococcus) En la partE noroccidEntal dE la plataforma continEntal dEl golfo dE cádiz: rElación con las propiEdadEs tErmohalinas y dE nutriEntEs. -Durante cuatro campañas, verano y otoño 2006 e invierno y primavera 2007, se examinó la evolución estacional de nutrientes, clorofila-a (chl-a) y cianobacterias en la parte noroccidental de la plataforma continental del Golfo de Cádiz. Se tomaron muestras para el analisis de la distribución de chl-a y cianobacterias y para analizar su acoplamiento con las propiedades termohalinas y químicas en la región del golfo. La distribución superficial de nutrientes presentaba una clara estacionalidad, de hecho las máximas concentraciones se registraron en toda el área de estudio durante el invierno debido a la mezcla invernal y a la fuerte influencia del los aportes del rio Guadalquivir y la Bahía de Cádiz. Los máximos niveles de chl-a se alcanzaron en primavera en toda la región y en toda la columna de agua. Mínimos valores de chl-a se observaron en verano, cuando prevalecían condiciones oligotróficas y en invierno cuando, a pesar de una alta concentración de nutrientes, el crecimiento del fitoplancton estaba limitado por la luz. La distribución de ambas poblaciones de cianobacterias varió tambien estacionalmente asociada a las condiciones oceanográficas. La máxima abundancia de células de Prochlorococcus se observó en aguas superficiales durante las cuatro campañas, a excepción de la región norte en verano. Po...

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Section: Spatial and Seasonal Distribution Of Chl-a And Cyanobacteriasupporting

confidence: 66%

Seasonal evolution of cholorophyll-a and cyanobacteria (Prochlorococcus and Synechococcus) on the northeast continental shelf of the Gulf of Cádiz: relation to thermohaline and nutrients fields

Anfuso¹,

Debelius²,

Castro³

et al. 2013

Sci. Mar.

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“…In general, in the western Mediterranean, especially in the Alboran basin, the surface circulation patterns are really complex-depending mostly on the Atlantic water input and involving the formation of several gyres (e.g. Ruiz et al 2002;García-Lafuente et al 2006). On the other hand, surface currents in the Azores Islands are influenced by the Azorean Currents, the easternmost arm of the Gulf Stream.…”

Section: Discussionmentioning

confidence: 99%

Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

et al. 2012

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The amphipod Caprella andreae Mayer, 1890 was recorded for the first time in Southern Iberian Peninsula (36°44 0 15 00 N, 3°59 0 38 00 W). This species is the only obligate rafter of the suborder Caprellidea and has been reported to attach not only to floating objects such as ropes or driftwoods but also to turtle carapaces. Mitochondrial and nuclear markers were used to examine dispersal capabilities and population genetic structure of C. andreae across seven localities in the Mediterranean and Atlantic Ocean collected from floating substrata with different dispersal patterns. The strong population differentiation with no haplotypes shared between populations suggests that C. andreae is quite faithful to the substratum on which it settles. In addition, the proportionally higher genetic diversity displayed in populations living on turtles as well as the presence of highly differentiated haplotypes in the same turtle population may be indicative that these populations survive longer, which could lead C. andreae to prefer turtles instead of floating objects to settle and disperse. Therefore, rafting on floating objects may be sporadic, and ocean currents would not be the most important factor shaping patterns of connectivity and population structure in this species. Furthermore, molecular phylogenetic analyses revealed the existence of a cryptic species whose estimates of genetic divergence are higher than those estimated between C. andreae and other congeneric species (e.g. Caprella dilatata and Caprella penantis). Discovery of cryptic species among widely distributed small marine invertebrates is quite common and, in this case, prompts for a more detailed phylogenetic analysis and taxonomic revision of genus Caprella. On the other hand, this study also means the first record of the gammarids Jassa cadetta and Elasmopus brasiliensis and the caprellid Caprella hirsuta on drifting objects.

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“…Recently, the GoC has been the subject of oceanographic studies dealing with surface and deep circulation, aimed at understanding the mechanisms of water exchange between the Atlantic Ocean and the Mediterranean Sea; as well as the behaviour of the dense plume of Mediterranean water [13,[33][34][35]. Figure 3 shows a TS diagram obtained aer a cruise in the GoC [13].…”

Section: Gulf Of Cadizmentioning

confidence: 99%

Water Circulation, Sediment Transport, and Pollutant Dynamics in Southern Iberia Waters: A Review on Numerical Modelling Studies

Periáñez

2013

ISRN Oceanography

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Southern Iberian Peninsula coastal waters have a high ecologic and economic value. e objective of this work has consisted of describing numerical models which simulate the dispersion of particle-reactive tracers in these waters and reproducing measured concentration levels in water and bed sediment samples. Additionally, information on suspended matter concentration distributions and sedimentation rates is obtained. In the Alboran Sea, the model has been applied to simulate the transport of radionuclides introduced from atmospheric fallout. Transport pathways of heavy metals discharged from three rivers draining a large mining area have been obtained for the Gulf of Cadiz. It has been found that these rivers constitute a source of trace elements to the Mediterranean through the Strait of Gibraltar. Some characteristic times have been calculated, as well as �uxes of isotopes through the Strait of Gibraltar, as additional results of environmental interest.

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Water mass circulation on the continental shelf of the Gulf of Cádiz

Cited by 155 publications

References 20 publications

Seasonal evolution of cholorophyll-<i>a</i> and cyanobacteria (<i>Prochlorococcus</i> and <i>Synechococcus</i>) on the northeast continental shelf of the Gulf of Cádiz: relation to thermohaline and nutrients fields

Seasonal evolution of cholorophyll-<i>a</i> and cyanobacteria (<i>Prochlorococcus</i> and <i>Synechococcus</i>) on the northeast continental shelf of the Gulf of Cádiz: relation to thermohaline and nutrients fields

Long-distance dispersal, low connectivity and molecular evidence of a new cryptic species in the obligate rafter Caprella andreae Mayer, 1890 (Crustacea: Amphipoda: Caprellidae)

Water Circulation, Sediment Transport, and Pollutant Dynamics in Southern Iberia Waters: A Review on Numerical Modelling Studies

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