Preliminary Studies on the Export of Organic Matter During Phytoplankton Blooms off La Coruña (Northwestern Spain)

Bode, Antonio; Varela, Manuel; Barquero, Susana; Ossorio-Alvarez, Ma Teresa; González, Nieves López

doi:10.1017/s0025315400039928

Cited by 34 publications

(34 citation statements)

References 18 publications

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“…were of the same order as previous values reported for the Galician coast (Bode et al, 1998;Piedracoba et al, 2008;Varela et al, 2004) and did not show any significant seasonal variations (p > 0.1) (Fig. 3).…”

Section: Vertical Fluxes Of Organic Carbonsupporting

confidence: 87%

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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Section: Vertical Fluxes Of Organic Carbonsupporting

confidence: 87%

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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“…In many estuarine, coastal and shelf regions, areas occur where the surface sediment is composed of fecal pellets (Risk & Moffat 1977, Minoura & Osaka 1992, Bode et al 1998. The results of this study suggest that in such areas the mineralization of organic matter is enhanced by pelletization, which causes a secondary permeability of the sediment surface, permitting rapid advective exchange and efficient decomposition.…”

Section: +mentioning

confidence: 72%

Role of pelletization in mineralization of fine-grained coastal sediments

Wild

Røy

Huettel

2005

Mar. Ecol. Prog. Ser.

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“…Chl a and phaeopigments, were determined as described above for the water column. Phytoplankton derived carbon was calculated as described in Bode et al (1998). First, chlorophyll-equivalent concentrations (hereafter referred to as chl a equiv) were computed as: chl a equiv = chl a + 1.51 phaeo, where 1.51 is the ratio of the molecular weights of chl a and phaeo.…”

Section: Methodsmentioning

confidence: 99%

“…It is also a process that serves to eliminate the carbon accumulated in the upper layer of the oceans. (Knauer et al 1984, Asper et al 1992, Olesen & Lundsgaard 1995, Bode et al 1998. Despite their comparatively limited spatial extent, biogeochemical fluxes in coastal and shelf areas are of great importance.…”

Section: Introductionmentioning

confidence: 99%

“…This is what occurs in temperate areas (Smetacek 1980, Bender et al 1992 like Galicia, where the main productivity and vertical flux take place in conjunction with spring and upwelling blooms. The composition and structure of pelagic communities, together with various hydrographic and biological processes, affect the magnitude of vertical flux and, consequently, the quality and quantity of settling material (Fernández et al 1995, Bode et al 1998, Anadón et al 2002. These different situations have a direct impact on the transport of organic material and, sometimes, the process results in a clear uncoupling between pelagic production and vertical flux to the bottom (Bode et al 1998, Olli et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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Vertical biogenic particle flux in a western Galician ria (NW Iberian Peninsula)

Varela¹,

Prego²,

Pazos³

2004

Mar. Ecol. Prog. Ser.

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Fluxes of particulate pelagic material were measured in the Pontevedra Ría (northwest Spain) using sediment traps moored at the base of the photic zone, deployed for 24 h periods from February to June 1998. Measurements of water column hydrography, chlorophyll, primary production and phytoplankton were taken. Samples were divided into low, moderate and high productivity periods, according to phytoplankton biomass. The vertical flux of carbon ranged from 530 to 1780 mg C m -2 d -1. Minimum values were recorded during high productivity periods, and were related to offshore advection of surface water. The daily export of carbon accounted for 75% of primary production. The contribution of phytoplankton to the sedimented carbon ranged from 18 to 66%, and the fraction corresponding to living phytoplankton from 5 to 25%. The dominance of phytoplanktonic over phytobenthic species, and the low C:N ratio, indicated a pelagic origin and a rapid sinking of the particles. Diatoms were predominant; however, microflagellates accounted for ca. 20% and dinoflagellates for 13% of the total biomass, suggesting the rapid formation of aggregates, increasing the sinking speed of individual cells. A decrease in sedimentation was observed from the inner to the outer ria, and from low to higher productivity periods. However, no differences were found among stations and periods. The flux of particulate carbon was similar in intensity throughout the ria in all periods. Sedimentation is influenced by hydrography, showing a negative relationship with water flux. Balance between advection and retention processes in the ria play an important role in the coupling between biomass stock in water and deposition of material in traps.

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Preliminary Studies on the Export of Organic Matter During Phytoplankton Blooms off La Coruña (Northwestern Spain)

Cited by 34 publications

References 18 publications

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

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

Role of pelletization in mineralization of fine-grained coastal sediments

Vertical biogenic particle flux in a western Galician ria (NW Iberian Peninsula)

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