Physical–biological interactions in the life history of small pelagic fish in the Western Iberia Upwelling Ecosystem

Santos, A. Miguel P.; Chícharo, Alexandra; Santos, Antonina Dos; Moita, Teresa; Oliveira, Paulo B.; Peliz, Álvaro; Ré, Pedro

doi:10.1016/j.pocean.2007.04.008

Cited by 117 publications

(80 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Santos et al (2007) found that the upwelling events could signiWcantly change the distribution of early larval stages of Sardina pilchardus, and Peliz et al (2007) working with a dispersal model for larvae crab obtained a good Wt between the release of Xoats from Aveiro and a large part of the Xoats retained in the shelf zone near the emission points. In addition, Shanks and Brink (2005) observed that the larvae of the congeneric species E. directus were below the thermocline, being swept onshore during upwelling events.…”

Section: Discussionmentioning

confidence: 99%

“…Several works have suggested the existence of some mechanism that might aVect the larval dispersion in Aveiro (Santos et al 2004(Santos et al , 2007Peliz et al 2007). Santos et al (2007) found that the upwelling events could signiWcantly change the distribution of early larval stages of Sardina pilchardus, and Peliz et al (2007) working with a dispersal model for larvae crab obtained a good Wt between the release of Xoats from Aveiro and a large part of the Xoats retained in the shelf zone near the emission points.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Strong genetic differentiation among east Atlantic populations of the sword razor shell (Ensis siliqua) assessed with mtDNA and RAPD markers

et al. 2010

View full text Add to dashboard Cite

The sword razor shell Ensis siliqua (Linnaeus, 1758) is a bivalve with a high commercial value being appreciated in fresh and processed markets. However, the genetic studies carried out in populations of E. siliqua are scarce. In this work, the genetic variability and diVerentiation of the sword razor shell was assessed using PCRRFLPs of a fragment of the 16S rRNA mitochondrial gene and random ampliWed polymorphic loci (RAPD) in nine localities from Ireland, Spain, and Portugal. In the 314 individuals examined for the mitochondrial fragment, 12 composite haplotypes were observed; meanwhile, a unique phenotype was observed for each of the 242 individuals analyzed with 61 RAPD loci. Two of the mitochondrial composite haplotypes accounted for the majority of individuals (89.81%) and showed a remarkably disjoint distribution between Irish and Iberian samples, with the exception of Aveiro which exhibited as the most frequent haplotype the same found in Ireland. The level of variability observed for each sample was generally correlated with both types of markers and the results obtained suggest the existence of a strong population diVerentiation between Irish and Iberian localities, except for the Portuguese sample from Aveiro which is surprisingly closer to Irish individuals, although it is probably highly diVerentiated.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Strong genetic differentiation among east Atlantic populations of the sword razor shell (Ensis siliqua) assessed with mtDNA and RAPD markers

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The differences in spawning season suggest that chub mackerel early life stages may be more tolerant to higher temperature than those of sardine, so the warming trend may be favouring chub mackerel recruitment and hindering sardine recruitment. However, other mechanisms are possible: for example, Santos et al (2007) suggested that the main mechanism responsible for impaired sardine recruitment is the increased frequency and intensity of upwelling events in winter (the spawning season), which promotes the dispersal of eggs and larvae away from suitable shelf areas for their survival.…”

Section: Discussionmentioning

confidence: 99%

Changes in the abundance and spatial distribution of the Atlantic chub mackerel (<i>Scomber colias</i>) in the pelagic ecosystem and fisheries off Portugal

Martins¹,

Skagen²,

Marques³

et al. 2013

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: This study describes changes in abundance and spatial distribution of Atlantic chub mackerel in the Portuguese waters and the Spanish waters of the Gulf of Cadiz using data from acoustic surveys from 1995 to 2010 and data from the fishery since 1958. The distribution and dynamics of chub mackerel and sardine (Sardina pilchardus) are compared and species interactions are discussed. From 2007 to 2009, chub mackerel biomass, as measured acoustically, ranged between 69000 and 238000 t concentrated off the western coast (~50%) and in the Gulf of Cadiz (~30%). Portuguese landings have varied with periods of high landings around 1970 and in recent years. Since 1986 landings have been between 4000 and 23000 t. Both survey catches and commercial landings are taken mainly off the southwestern coast and one-to two-year-old individuals (20-24 cm) predominate in both. Scarcity of larger individuals may be a consequence of their deeper distribution and avoidance of fishing gear, migration of older individuals or a combination of both. In years with high abundance, the fishery expands to the northwestern areas of the Iberian Peninsula. The expansion appears to be caused by improved recruitment although other factors might have contributed (such as targeting to compensate for low sardine catches and the appearance of new markets). The complementary spatial distribution of chub mackerel and sardine and the inverse correlations between their frequency of occurrence, landings and recruitment indices suggest some interaction between the dynamics of the two species, possibly associated with climatic variation.Keywords: Chub mackerel, sardine, Portugal, pelagic ecosystem, purse seine fishery. RESUMEN: Cambios en la abundancia y distribución espacial del estornino del Atlántico (Scomber coliaS) en el ecosistema pelágico y pesquerias de Portugal. -Este estudio describe los cambios en la abundancia y distribución espacial del estornino del Atlántico en las aguas portuguesas y aguas españolas del golfo de Cádiz a partir de datos de las prospecciones acústicas 1995-2010 y datos de la pesquería desde 1958. La distribución y la dinámica del estornino y de la sardina (Sardina pilchardus) se comparan y se analiza la interacción de las especies. Durante 2007-2009, la biomasa del estornino medida acústicamente osciló entre 69 y 238 mil t y se concentró frente a la costa occidental (~50%) y en el golfo de Cádiz (~30%). Los desembarques portugueses han variado con períodos de altas capturas alrededor de 1970 y en los últimos años. Desde 1986 los desembarques han sido entre 4 y 23 mil t. Ambas capturas de campañas y desembarques comerciales se toman principalmente en la costa sur occidental y individuos de 1-2 años edad (20 a 24 cm) predominan en ambos. La escasez de individuos más grandes puede ser una consecuencia de su distribución más profunda y la evitación de las artes de pesca, la migración de los individuos mayores o una combinación de ambos. En los años de mucha abundancia, la pesquería se expande a las áreas occidentales norte d...

show abstract

“…larvae and juvenile individuals) after egg hatching (Katara 2014). In the western area, the presence of the Western Iberian Buoyant Plume (WIBP; Peliz et al 2002) that transports lower salinity water from river discharge to offshore, allows for the growth and concentration of phytoplankton during winter, which coincides with the spawning season (Peliz and Fiúza 1999), and favours larval survival (Santos et al 2007). Also, the hypothesis of cannibalism should not be dismissed, as sardine species have been reported to cannibalize their own eggs and larvae (Garrido and van der Lingen 2014).…”

Section: Discussionmentioning

confidence: 99%

Essential habitat for sardine juveniles in Iberian waters

et al. 2017

View full text Add to dashboard Cite

Summary:In a period when the Iberian sardine stock abundance is at its historical minimum, knowledge of the sardine juvenile's distribution is crucial for the development of fishery management strategies. Generalized additive models were used to relate juvenile sardine presence with geographical variables and spawning grounds (egg abundance) and to model juvenile abundance with the concurrent environmental conditions. Three core areas of juvenile distribution were identified: the Northern Portuguese shelf (centred off Aveiro), the coastal region in the vicinity of the Tagus estuary, and the eastern Gulf of Cadiz. Spatial differences in the relationship between juvenile presence and egg abundances suggest that essential juvenile habitat might partially differ from the prevailing spawning grounds. Models also depicted significant relationships between juvenile abundance, temperature and geographical variables in combination with salinity in the west and with zooplankton in the south. Results indicate that the sardine juvenile distribution along the Iberian Peninsula waters are an outcome of a combination of dynamic processes occurring early in life, such as egg and larva retention, reduced mortality and favourable feeding grounds for both larvae and juveniles.Keywords: Portuguese coast; Gulf of Cadiz; acoustic survey; fish habitat; Sardina pilchardus; juveniles; fisheries management. Hábitat esencial para los juveniles de sardina en aguas IbéricasResumen: En un periodo de mínimo histórico para el stock de sardina ibérica, el conocimiento de la distribución de los juveniles de sardina resulta crucial para el desarrollo de estrategias de gestión pesquera. Se usaron modelos aditivos generalizados para relacionar la presencia de los juveniles de sardina con las variables geográficas y las principales zonas de desove (abundancia de huevos) y a su vez para relacionar la abundancia de los juveniles con las condiciones ambientales adyacentes. Se identificaron tres zonas centrales: la plataforma norte portuguesa (centrada enfrente de la localidad de Aveiro), la zona costera próxima al estuario del Tajo y la parte este del golfo de Cádiz. Las diferencias espaciales encontradas en la relación entre la presencia de juveniles y la abundancia de huevos sugieren que el hábitat esencial de los juveniles puede diferir parcialmente de las zonas de desove existentes. Los modelos también señalaron relaciones significativas entre la abundancia de juveniles, la temperatura, y las variables geográficas combinadas con la salinidad en el oeste y con el zooplancton en el sur. Los resultados indican que la distribución de los juveniles de sardina a lo largo de las aguas de la Península Ibérica resulta de la combinación de procesos dinámicos que se dan en edades tempranas, cómo la retención de huevos y larvas, una mortalidad reducida y zonas de nutrición con condiciones favorables tanto para larvas cómo para juveniles.Palabras clave: costa portuguesa; golfo de Cádiz; campaña acústica; hábitat de peces; Sardina pilchardus; juveniles; gestión ...

show abstract

Physical–biological interactions in the life history of small pelagic fish in the Western Iberia Upwelling Ecosystem

Cited by 117 publications

References 58 publications

Strong genetic differentiation among east Atlantic populations of the sword razor shell (Ensis siliqua) assessed with mtDNA and RAPD markers

Strong genetic differentiation among east Atlantic populations of the sword razor shell (Ensis siliqua) assessed with mtDNA and RAPD markers

Changes in the abundance and spatial distribution of the Atlantic chub mackerel (<i>Scomber colias</i>) in the pelagic ecosystem and fisheries off Portugal

Essential habitat for sardine juveniles in Iberian waters

Contact Info

Product

Resources

About