Physical oceanography of the western Iberia ecosystem: Latest views and challenges

Relvas, Paulo; Barton, Eric D.; Dubert, Jesús; Oliveira, Paulo B.; Peliz, Álvaro; Silva, J.C.B. da; Santos, A. Miguel P.

doi:10.1016/j.pocean.2007.04.021

Cited by 283 publications

(252 citation statements)

References 113 publications

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“…These patterns were captured by the model, although the offshore [Chl] was considerably lower than that observed in the satellite climatology, except in the vicinities of the shelf, where the cross-shelf exchange was probably the reason for the increased [Chl]. As for the shelf, the modeled [Chl] was similar to that observed in the SeaWiFS climatology (> 2 mg m -− 3 ), showing that the model could appropriately reproduce the increase in phytoplankton biomass due to the upwelling of cold and nitrate rich subsurface ENACW driven by the prevailing northerly winds and the associated offshore Ekman transport (Fraga, 1981;Peliz et al, 2002;Relvas et al, 2007). The [Chl] over the shelf seemed to be higher in the North, off the Galician Rias Baixas and the northwestern Portuguese shelf, than in the southwestern Portuguese shelf, both in the model and SeaWiFS images.…”

Section: Elsevier_marsys_2604supporting

confidence: 64%

“…related to spatial differences in the mesoscale activity (Relvas et al, 2007), which is thought to have effects on the spatial differences in the ecosystem along the Iberian margin (Cunha, 2002).…”

Section: Elsevier_marsys_2604mentioning

confidence: 99%

“…The upwelling season is driven by dominant northerly winds from April to September (Wooster et al, 1976), which cause an offshore Ekman transport of surface sea water and the upwelling of cold and nutrient rich subsurface Eastern North Atlantic Central Water (ENACW) (Fraga, 1981;Peliz et al, 2002;Relvas et al, 2007). Although nutrient levels of subsurface ENACW are 1/2 --1/3 of those in other upwelling systems, the gross primary production for the upwelling season (~ 2.5 g g C m -− 2 dayd -− 1 ) is similar to other coastal upwelling regions (Álvarez-Salgado et al, 2010;Arístegui et al, 2006).…”

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confidence: 99%

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Seasonal cycle of plankton production in the Iberian margin based on a high resolution ocean model

Reboreda

Nolasco

Castro

et al. 2014

Journal of Marine Systems

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Section: Elsevier_marsys_2604supporting

confidence: 64%

Section: Elsevier_marsys_2604mentioning

confidence: 99%

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confidence: 99%

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Seasonal cycle of plankton production in the Iberian margin based on a high resolution ocean model

Reboreda

Nolasco

Castro

et al. 2014

Journal of Marine Systems

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“…On the other hand, surface currents in the Azores Islands are influenced by the Azorean Currents, the easternmost arm of the Gulf Stream. Additionally, although the main current pattern along the Portuguese coast flows southward, seasonal winds can lead to a reversal of the flowing direction (Relvas et al 2007). Moreover, there is a branch of the Portugal Current that flows eastward entering the Mediterranean, but the presence of some quasi-permanent cyclonic eddies make its flows difficult.…”

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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“…These differences are illustrated by the divergence in the results observed by Pascoal et al (2009) and Domingues et al (2010), for the same geographical region. Finally, the oceanographic conditions along the western Iberian Peninsula ecosystem are variable throughout the year, and more unstable than previously thought (reviewed in Relvas et al, 2007). For example, during the winter months transient nearshore poleward flows, eddy shedding from the poleward slope current and even intermittent upwelling events are observed.…”

Section: Introductionmentioning

confidence: 99%

Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

et al. 2010

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Despite the importance of larval biology in the life histories of many marine animals, relatively little information exists on the dynamics and genetic composition of larval cohorts. The supply of megalopae larvae of the shore crab, Carcinus maenas, was measured on a daily basis during 8 months spread along two larval periods (2006 and 2007) at the Ria de Aveiro estuary, on the Portuguese northwest coast. A total of 10 microsatellite DNA loci were employed to explore the genetic structure, variability and relatedness of temporally distinct megalopal events, selected from the major pulses of supply. Larval variation was also compared genetically with that of a previously studied adult crabs sample, at the same loci, collected in 2006 and 2007 along the Iberian Peninsula. Results revealed a lack of genetic differentiation and identical diversity levels among larval events over time. No evidence of reduced genetic diversity between megalopae relative to the diversity assessed from the pooled sample of adults was found. Moreover, there was no evidence of any family relatedness among larvae from temporal events. The results obtained for C. maenas contradict predictions made by the sweepstakes reproduction hypothesis, in which large variance in reproductive success is expected, which is presumably detectable as sharp genetic discontinuities among separate larval events. Data here indicate conversely a high degree of temporal genetic stability among larval supply to a given estuary under variable oceanographic conditions, consistent with the hypothesis that sampled larvae were drawn from a large number of adults that do not differ in reproductive success.

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Physical oceanography of the western Iberia ecosystem: Latest views and challenges

Cited by 283 publications

References 113 publications

Seasonal cycle of plankton production in the Iberian margin based on a high resolution ocean model

Seasonal cycle of plankton production in the Iberian margin based on a high resolution ocean model

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

Temporal genetic homogeneity among shore crab (Carcinus maenas) larval events supplied to an estuarine system on the Portuguese northwest coast

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