Benthic fluxes of inorganic carbon in shallow coastal ecosystems of the Iberian Peninsula

Forja, Jesús M.; Ortega, T.; DelValls, T.À.; Gómez-Parra, Abelardo

doi:10.1016/j.marchem.2003.09.007

Cited by 47 publications

(28 citation statements)

References 63 publications

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“…Likewise, averaged BRQ was 0.76 ± 0.23 which can be considered low compared to values reported by Hopkinson & Smith (2005) from different estuaries worldwide, and values obtained by Forja et al (2004) at 5 different coastal sites in the Iberian Peninsula (1.1 to 3.1). These low BRQ values point to the preference of aerobic catabolic processes in the degradation of organic matter at the sediment surface.…”

Section: Benthic Fluxescontrasting

confidence: 67%

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: Benthic Fluxescontrasting

confidence: 67%

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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“…Similar seasonal changes in SOC have also been observed in the Corpus Christi Bay (McCarthy et al, 2008), Orbetello Lagoon (Bartoli et al, 2009) and the Gulf of Trieste (Faganeli and Ogrinc, 2009). SOC has been observed to be enhanced by macrofaunal activity (Kristensen, 2000; Nizzoli et al, 2007;Braeckman et al, 2010) and higher temperature (Hargrave, 1969;Thamdrup et al, 1998;Rowe et al, 2002;Forja et al, 2004). Average bottom water temperature at the present site varies from 28 • C during April to 22 • C during October .…”

Section: Sediment Oxygen Consumption (Soc) and Sulfide Oxidationmentioning

confidence: 76%

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

et al. 2014

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Abstract. The western Indian continental shelf is one of the most productive coastal systems of the world ocean. This system experiences extreme changes in its oxygen regime, being normoxic from November to May and suboxic (denitrifying)/anoxic from June to October, owing to the biogeochemical response to cyclical monsoonal influence. In order to understand the impact of the seasonally varying oxygen regime on benthic mineralization, nutrient exchange and, in turn, on the shelf ecosystem, we carried out the first ever intact-core incubations during two contrasting seasons -spring intermonsoon and fall intermonsoon (late southwest monsoon) at a 28 m-deep fixed site on the inner shelf off Goa, dominated by fine-grained cohesive sediments. The results showed that incomplete sediment oxygen consumption (SOC) occurred during April as opposed to the complete SOC and subsequent sulfide flux observed in the fall intermonsoon incubations. The sediments acted as a perennial net source of DIN (dissolved inorganic nitrogen i.e. NO Slow oxidation of organic carbon (C org ) under anoxia, lower temperature and reduced benthic faunal activity appeared to decrease benthic mineralization by 25 % as suggested by the drop in the C org oxidation rate from 63.8 mmol C m −2 d −1 in April to 47.8 mmol C m −2 d −1 in October. This indicated a higher preservation of C org during the late southwest monsoon. Sediment porosity, C org content and nutrients did not show significant variations from April to October. Porewaters were found to be enriched with NH

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“…However, Tengberg et al (2004) argued that in sediments with high oxygen uptakes (>11 mmol m imposed by the DBL could be higher, and therefore, there could possibly be more differences among the fluxes measured with the different chambers. Therefore in coastal active sediments, where oxygen uptake is often very high (e.g., López et al 1995;Berelson et al 1998;Forja et al 2004;Ortega et al 2005) and where macrofauna normally play an important role in benthic exchange (Forja and Gómez-Parra 1998;Glud et al 2003), the effect of overlying hydrodynamics on benthic fluxes is probably higher. Recently, Glud et al (2007) demonstrated that, although DBL thickness has only a modest effect on the annual O 2 uptake, it can strongly affect benthic O 2 concentration and O 2 uptake in a time scale of a few hours.…”

Section: Discussionmentioning

confidence: 99%

“…Apart from avoiding sediment manipulation, the sediment surface covered by the chamber can be relatively large and, therefore, it can take into account the variability caused by fine-scale sediment heterogeneity, as well as the contribution of benthic fauna. In fact, the presence of meio-and macrobenthos in natural environments can significantly enhance sediment-water exchange by bioturbation and bioirrigation (Aller and Aller 1986;Forja and Gómez-Parra Glud et al 2003). To correctly represent the faunal activity when measuring benthic fluxes, measurements should preferably be made in situ and with relatively large benthic chambers (Glud and Blackburn 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Benthic fluxes of inorganic carbon, nutrients, and oxygen have previously been measured in situ in coastal waters of the Iberian Peninsula by means of opaque Plexiglas stirred chambers Gómez-Parra 1998, Forja et al 2004;Ortega et al 2005Ortega et al , 2008. These chambers, apart from requiring SCUBA divers for their correct placement over the sea-bottom, had to be physically connected to a vessel or a dock at the sea surface so that sample collection could be triggered manually.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic characterization and performance of an autonomous benthic chamber for use in coastal systems

Ferrón

Alonso-Pérez

Castro

et al. 2008

Limnology & Ocean Methods

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A benthic chamber (covering 5030 cm 2 of seafloor) with real-time control of sampling and sensor data transmission has been developed for studying benthic fluxes in coastal sediments. Enclosed water is stirred by three submersible centrifugal pumps, which are connected to power circuits that regulate their input voltage, and thus, the current velocity inside the chamber. The complete mixing of the incubated water is achieved within 4 min. The 3-D velocity field and the distribution of the diffusive boundary layer (DBL) inside the chamber were characterized at different pump rates in a laboratory tank with a bottom layer of sediment or a false bottom supporting alabaster dissolution plates. Two different outlet devices from the pumps were tested. For the one finally selected, averaged tangential velocities at 5 cm above the bottom ranged from 2.0 cm s -1 to 4.8 cm s -1, depending on the voltage applied to the pumps, providing averaged DBL thicknesses that ranged from 125 μm to 279 μm. Average tangential velocity and average DBL thickness were found to correlate according to: V H = 615 × [DBL] -1.02 (R 2 = 0.97). Successful field chamber measurements were performed in two shallow coastal systems: Ría de Vigo (NW Spain) and Bay of Cádiz (SW Spain).

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Benthic fluxes of inorganic carbon in shallow coastal ecosystems of the Iberian Peninsula

Cited by 47 publications

References 63 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)

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

Hydrodynamic characterization and performance of an autonomous benthic chamber for use in coastal systems

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