Low-salinity plumes in the oceanic region of the Basque Country

Ferrer, Luis Gabriel; Fontán, Almudena; Mader, Julien; Chust, Guillem; González, Manuel; ­Valencia, Victoriano; Uriarte, Adolfo; Collins, Michael B.

doi:10.1016/j.csr.2008.12.014

Cited by 76 publications

(59 citation statements)

References 45 publications

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“…The model domain covers the whole of the Bay of Biscay, extending from the French and Spanish coasts (40.5°N) to the south of the United Kingdom (about 52.5°N) and to 13°W. The present model configuration of the whole of the Bay of Biscay is an extension of one limited to the south of the region developed by Ferrer et al (2009). The bathymetry was obtained by interpolation, following optimisation analysis, of the two-minute digital Elevation TOPOgraphic model (ETOPO2, Smith and Sandwell 1997), General Bathymetric Chart of the Oceans (GEBCO), and International Bathymetric Chart of the Mediterranean (IBCM) data sets.…”

Section: Hydrological Model and Lagrangian Transportmentioning

confidence: 99%

The fate of eggs and larvae of three pelagic species, mackerel (Scomber scombrus), horse mackerel (Trachurus trachurus) and sardine (Sardina pilchardus) in relation to prevailing currents in the Bay of Biscay: Could they affect larval survival?

Álvarez¹,

Chifflet²

2012

Sci. Mar.

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SUMMARY:The spatial distribution of eggs and larvae of three pelagic species, mackerel, horse mackerel and sardine, in the Bay of Biscay was studied in 1998, 2001 and 2004. The spatial distribution was clearly different between the years studied and corresponds quite precisely to different water circulation regimes. Mackerel and horse mackerel larvae are more affected by the prevailing currents than sardine, as their spawning grounds are located offshore, far from the shelf break where the current velocities are higher. Survival rates for mackerel and horse mackerel were higher in 2001, when the offshore larval transport was stronger. However, for sardine, the mortality rate hardly varied between years. The abundance of 25-day-old larvae, considered as an index of the survival rate, appears to be a good recruitment indicator, at least for 1998, 2001 and 2004. Our results did not support the hypothesis of Bakun (1996), which states that dispersion of early life stages towards open ocean waters should cause high larval mortality. At least under the conditions observed for the years studied, the retention of larvae offshore appears to have a positive effect on larval growth and/or survival.Keywords: ichthyoplankton, Bay of Biscay, survival rates, larval transport, recruitment. RESUMEN: El dEstino dE huEvos y larvas dE trEs EspEciEs pElágicas caballa, (Scomber ScombruS), jurEl (TrachuruS TrachuruS) y sardina (Sardina pilcharduS) En rElación a las corriEntEs prEvalEntEs En El árEa dEl golfo dE vizcaya. ¿podrían afEctar a la supErvivEncia larvaria? -La distribución espacial de los huevos y larvas de tres especies pelágicas, caballa, jurel y sardina en el Golfo de Vizcaya fue estudiada en 1998, 2001 y 2004. Esta distribución espacial fue claramente diferente entre los años estudiados y se ajustan, bastante bien a los diferentes regímenes de circulación. Las larvas de caballa y jurel resultaron más directamente afectadas por estas corrientes prevalentes que las larvas de sardina. Esto se explica porque las sardinas desovan en la plataforma, relativamente alejadas del cantil, donde las velocidades de las corrientes son más altas. Las tasas de supervivencia larvaria de caballa y jurel fueron superiores en 2001, cuando el transporte de larvas offshore era más importante. Para las larvas de sardina, sin embargo, la tasa de mortalidad apenas varió entre años. La abundancia de larvas mayores de 25 días, considerada aquí como un índice de la tasa de supervivencia larvaria, resultó ser un buen indicador del reclutamiento por lo menos para los años estudiados. Nuestros resultados contradicen la teoría de Bakun (1996), que afirma que la dispersión de las etapas de vida temprana hacia las aguas del océano abierto causa una alta mortalidad larvaria. Por lo menos bajo la condición que se observó durante estos años (temperatura y abundancia de alimento), la retención de larvas en mar abierto parece tener un efecto positivo en el crecimiento larvario y/o supervivencia.

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Section: Hydrological Model and Lagrangian Transportmentioning

confidence: 99%

The fate of eggs and larvae of three pelagic species, mackerel (Scomber scombrus), horse mackerel (Trachurus trachurus) and sardine (Sardina pilchardus) in relation to prevailing currents in the Bay of Biscay: Could they affect larval survival?

Álvarez¹,

Chifflet²

2012

Sci. Mar.

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“…As a consequence, the estuarine ecosystems will be subjected to more contrasting periods of lower river flow waters to higher hydrodynamic, turbid waters. If these expected rainfall regimes and temperature increases also take place in adjacent areas, nearby rivers such as the Adour (France), which can affect the Basque coastal waters during large fresh water discharges (Ferrer et al 2009, Petus et al 2010, could shift from a nival regime to a nival-pluvial regime.…”

Section: Coastal Floodingmentioning

confidence: 99%

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Chust¹,

Borja²,

Caballero³

et al. 2011

Clim. Res.

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The impacts of global climate change on the Basque coast and the pelagic systems within the southeastern Bay of Biscay are reviewed. Climate projections under greenhouse gas emission scenarios indicate that this area will experience changes in climate throughout the 21st century, including warming of surface air (especially heat wave episodes), intensification of extreme daily rainfall (10%), warming of the upper 100 m of the ocean layer (1.5 to 2.05°C), and sea level rise (SLR; 29 to 49 cm). Observations made in the bay throughout the 20th century for air temperature and mean sea level are in agreement with these projections. Trends in ocean-climatic historical observations within the area, including sea temperature, precipitation, upwelling/downwelling, turbulence and wave climate, are also reviewed. The main impacts on the coast are expected to be from SLR, especially in low-lying areas (mostly urbanised) within estuaries. Sandy beaches are also expected to undergo significant mean shoreline retreats of between 25 and 40% of their width. As the sea level rises, the natural migration of saltmarshes and intertidal seagrasses landward will be constrained, in most cases, by existing anthropogenic fixed boundaries. Empirical relationships between the distribution and dynamics of the long-term biological measures (plankton, primary production, benthos, and fisheries) on the one hand, and ocean-climatic variability on the other, indicate that pelagic and coastal water ecosystems will be affected by ocean warming, increased stratification, shifts in anomaly patterns and streamflow regimes. The largest uncertainties are associated with the lack of downscaled projections within the bay on ocean circulation, ocean-meteorological indices, wave climate and ocean acidification.

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“…The model domain covers the whole Bay of Biscay, extending from the French and Spanish coasts (40.5°N) to the south of the United Kingdom (about 52.5°N) and 13°W. In this present configuration, which is an extension of a configuration limited to the southern Bay of Biscay (Ferrer et al 2009), the bathymetry was obtained by interpolation following an optimization analysis of the ETOPO2 (2 minute digital Elevation TOPOgraphic model, Smith & Sandwell, 1997), GEBCO (General Bathymetric Chart of the Oceans), and IBCM (International Bathymetric Chart of the Mediterranean) data sets. Bottom depth was obtained from this bathymetry.…”

Section: Methodsmentioning

confidence: 99%

Modelling the spatio-temporal distribution of age-1 Bay of Biscay anchovy (Engraulis encrasicolus) at spawning time

et al. 2013

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SUMMARY: To efficiently manage and maintain fish stock abundance and age structure, it is necessary to understand variability in its spatial distribution. The main objective of this study was to describe the demographic structure of the Bay of Biscay anchovy during the main spawning period based on adult samples from 15 daily egg production method surveys. The proportion of age-1 individuals was modelled using generalized additive models with a binomial distribution and a logit link in relation to geographical and environmental covariates. The possibility of obtaining different models depending on the average age-1 proportion (low or high) was also explored. In general, age-1 individuals were found in shallow waters close to the coast, especially associated with the Gironde and Adour river plumes, whereas older individuals were prevalent on the shelf break and in oceanic waters. However, in years with a high age-1 proportion the younger individuals were also dominant in oceanic waters. These results could be used for management purposes, such as defining protected areas for particular age groups.Keywords: spatial age composition, anchovy, Bay of Biscay, daily egg production method, generalized additive model, environmental effects.RESUMEN: Distribución espacio-temporal de la edad 1 de anchoa del golfo de Bizkaia (Engraulis Encrasicolus) en el momento de puesta. -Con el fin de gestionar eficientemente la abundancia y la estructura espacial de un stock es necesario entender su distribución espacial. El objetivo principal de este trabajo es describir la estructura demográfica de la anchoa del golfo de Bizkaia durante el periodo de desove a partir de las muestras de adultos recogidas en 15 campañas del método de producción diaria de huevos. La proporción de individuos de edad 1 se modeló en función de variables geográficas y ambientales por medio de un modelo aditivo generalizado con distribución binomial y función enlace logit. Además se estudió la posibilidad de obtener diferentes modelos dependiendo de si la proporción de edad 1 promedio es baja o alta. En general, los individuos de edad 1 se encontraron en aguas poco profundas cerca de la costa, especialmente en las plumas de los ríos Garona y Adur, mientras que los individuos de mayor edad prevalecieron en el cantil y en aguas oceánicas. Sin embargo, los años con una alta proporción de edad 1, los individuos jóvenes fueron también predominantes en aguas oceánicas. Estos resultados podrían utilizarse para fines relacionados con la gestión, tales como la definición de áreas protegidas para determinados grupos de edad.Palabras clave: composición de edad espacial, anchoa, golfo de Bizkaia, método de producción diaria de huevos, modelo aditivo generalizado, efectos ambientales.

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Low-salinity plumes in the oceanic region of the Basque Country

Cited by 76 publications

References 45 publications

The fate of eggs and larvae of three pelagic species, mackerel (<i>Scomber scombrus</i>), horse mackerel (<i>Trachurus trachurus</i>) and sardine (<i>Sardina pilchardus</i>) in relation to prevailing currents in the Bay of Biscay: Could they affect larval survival?

The fate of eggs and larvae of three pelagic species, mackerel (<i>Scomber scombrus</i>), horse mackerel (<i>Trachurus trachurus</i>) and sardine (<i>Sardina pilchardus</i>) in relation to prevailing currents in the Bay of Biscay: Could they affect larval survival?

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Modelling the spatio-temporal distribution of age-1 Bay of Biscay anchovy (<i>Engraulis encrasicolus</i>) at spawning time

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