Upwelling and outwelling effects on the benthic regime of the continental shelf off Galicia, NW Spain

López-Jamar, E.; Cal, Rosa; Gonzalez, G.; Hanson, Roger B.; Rey, J.; Santiago, Gerardo Garcia; Tenore, Kenneth R.

doi:10.1357/002224092784797584

Cited by 73 publications

(36 citation statements)

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“…Therefore, the observed concentrations may not have exerted inhibitory eVects on the benthic fauna of Mejilliones Bay. This is also supported by abundant deposit-feeding polychaetes (Orbiniidae), which are typical of higher successional stages of the community (Tarazona et al 1988a(Tarazona et al , 1996López-Jamar et al 1992), whereas suspension feeders such as the polychaete Owenia sp. dominated during EN 1992(Tarazona et al 1996.…”

Section: Feeding Modesmentioning

confidence: 92%

Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)

et al. 2007

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The macrozoobenthos of Mejillones Bay (23°S; Humboldt Current) was quantitatively investigated over a 7-year period from austral summer 1995/1996 to winter 2002. About 78 van Veen grab samples taken at six stations (5, 10, 20 m depth) provided the basis for the analysis of the distribution of 60 species and 28 families of benthic invertebrates, as well as of their abundance and biomass. Mean abundance (2,119 individuals m ¡2 ) was in the same order compared to a previous investigation; mean biomass (966 g formalin wet mass m ¡2 ), however, exceeded prior estimations mainly due to the dominance of the bivalve Aulacomya ater. About 43% of the taxa inhabited the complete depth range. Mean taxonomic Shannon diversity (HЈ, Log e) was 1.54 § 0.58 with a maximum at 20 m (1.95 § 0.33); evenness increased with depth. The fauna was numerically dominated by carnivorous gastropods, polychaetes and crustaceans (48%). About 15% of the species were suspensivorous, 13% sedimentivorous, 11% detritivorous, 7% omnivorous and 6% herbivorous. Cluster analyses showed a signiWcant diVerence between the shallow and the deeper stations. Gammarid amphipods and the polychaete family Nephtyidae characterized the 5-mzone, the molluscs Aulacomya ater, Mitrella unifasciata and gammarids the intermediate zone, while the gastropod Nassarius gayi and the polychaete family Nereidae were most prominent at the deeper stations. The communities of the three depth zones did not appear to be limited by hypoxia during non-El Niño conditions. Therefore, no typical change in community structure occurred during El Niño 1997-1998, in contrast to what was observed for deeper faunal assemblages and hypoxic bays elsewhere in the coastal Humboldt Current system.

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Section: Feeding Modesmentioning

confidence: 92%

Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)

et al. 2007

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“…1/4 of the GPP. This proportion is higher during spring and summer, when export/advection of organic material to the adjacent shelf is favoured by means of outwelling events and be an important food for the shelf benthic commuties (López-Jamar et al, 1992).…”

Section: Nem: Importance Of Benthic Fluxes Mussel Culture and Fisheriesmentioning

confidence: 98%

Benthic fluxes, net ecosystem metabolism and seafood harvest: Completing the organic carbon balance in the Ría de Vigo (NW Spain)

Alonso-Pérez

Zúñiga

Arbones

et al. 2015

Estuarine, Coastal and Shelf Science

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Simultaneous direct measurements of primary production, pelagic and benthic respiration and vertical fluxes allowed, for the first time, the evaluation of the carbon metabolism in the Ría de Vigo (NW Spain) on seasonal and annual scales. With this aim, a total of 16 oceanographic cruises covering the main oceanographic conditions were carried out between April 2004 and January 2005. In addition, a 2D carbon budget, including extraction from mussel culture and fisheries activities, is proposed.The pelagic system was net autotrophic during the spring and summer periods and autotrophic or almost in balance during autumn and winter. Vertical fluxes of organic carbon were higher than net community production (NCP) during autumn and winter periods, probably due to resuspension processes and inputs of organic matter from continental runoff. Benthic mineralization is an important process in the Ría de Vigo, which gains significance during autumn and winter when benthic respiration accounts for 40% and 45% of the total respiration, respectively. The Ría de Vigo is net autotrophic on annual basis (317 ± 113 g C m -2 yr -1 ) even though the benthic metabolism reduces the NCP by 23%. Total annual carbon seafood harvest amounted 3% of the net ecosystem metabolism and it is dominated by mussel culture (89%).However, based on mean energy transfer efficiency between trophic levels of 10%, it is estimated that mussel culture and reported fish catches require up to 38% of the NCP.The organic carbon produced in situ at the Ría de Vigo and available for export to the adjacent shelf or to be buried in the sediment represents ¼ of the gross primary production and it is favoured during summer upwelling.3 HighlightsAn annual carbon budget including benthic fluxes and seafood harvest is proposed.The Ría de Vigo is net autotrophic on annual basis (317 ± 113 g C m -2 yr -1 ).Benthic remineralization reduces the autotrophy of the system by 23 %.Mussel culture and fisheries require 38 % of the net community production.Shelf carbon export and sediment burial account for ¼ of the gross primary production.

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“…The impact of upwelling on Quaternary sediments of the rias and continental shelf has only superficially been studied (Rey and Diaz del Rio, 1987;Lopez-Jamar et al, 1992;Prego et al, 1995;Prego and Bao, 1997). Although fossil diatom assemblages in surface sediments of upwelling affected areas have been proven as powerful upwelling indicators (Schuette and Schrader, 1981 a,b;Abrantes, 1988;Schrader and Sorknes, 1991), there are only a few studies of the fossil diatom composition of the rias and shelf sediments of the Galician area and these (e.g.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale distribution patterns of diatoms in surface sediments as tracers of coastal upwelling of the Galician Shelf (NW Iberian Peninsula)

1997

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Diatom distribution on continental shelf sediments from the upwelling area off Galicia (NW Iberian Peninsula) has been determined in 78 surface sediment samples. Three well defined biofacies with a close relationship to upwelling influence along the coast have been distinguished from both the absolute diatom abundances in the sediments and assemblage diatom composition based on multivariate statistics: Rias Baixas and the shelf areas south and north to Cape Finisterre. Chaetoceros resting spores as well as highest absolute diatom content in the sediments are recorded in the highly productive Rias Baixas where most of the primary production is due to intense upwelling phenomena. The western shelf, south of Cape Finisterre, is characterized by Thalassionema nitzschioides and Thalassiosira cf. leptopus. Both taxa reflect a minor influence of upwelling conditions and productivity related to more persistent nutrient input due to coastal outwelling rather than upwelling. Minor and patchy upwelling conditions as well as lower productivity in the northern shelf are characterized by the lowest absolute diatom content in the sediments and the important increase in relative abundance of the resistant Paralia sulcata. Caution must be taken in the interpretation of Paralia sulcata dominated biofacies in downcore studies since a juxtaposition of discontinuous upwelling conditions and dissolution effects may be the factors responsible for the relative increase on the taxon in the sediments. The obtained resultsshow the extent and limitations of fossil diatom distribution in surface sediments as tracers of regional coastal upwelling conditions in continental shelves where the existence of extensive areas of relict sediments and transported diatoms may mask the present-day upwelling signal of the photic zone.

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Upwelling and outwelling effects on the benthic regime of the continental shelf off Galicia, NW Spain

Cited by 73 publications

References 0 publications

Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)

Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)

Benthic fluxes, net ecosystem metabolism and seafood harvest: Completing the organic carbon balance in the Ría de Vigo (NW Spain)

Mesoscale distribution patterns of diatoms in surface sediments as tracers of coastal upwelling of the Galician Shelf (NW Iberian Peninsula)

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