Measuring nutrient fluxes across the sediment-water interface using benthic chambers

Forja, Jesús M.; Gómez-Parra, Abelardo

doi:10.3354/meps164095

Cited by 50 publications

(17 citation statements)

References 26 publications

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“…This underestimation of the diffusive fluxes was obtained using a spatial resolution in vertical profiles of 1 cm, and confirms the importance of macrofaunal irrigation in the exchange of nutrients between sediment and overlying water (e.g. Aller, 1978;Callender and Hammond, 1982;Doering et al, 1987;Clavero et al, 1991;Forja and Gómez-Parra, 1998). In most cases, the positive values of phosphate diffusive fluxes indicate that this nutrient is released during organic matter diagenesis and is exported from sediment to the water column (Table 4).…”

Section: Diffusive and Benthic Fluxesmentioning

confidence: 66%

“…The current problem of this system focuses on the large population concentrated in the zone, which carries with it other problems such as contaminant accumulation. Much research has been done on this area, primarily focusing on the diagenesis of organic matter in sediments and on benthic fluxes (Gómez-Parra and Forja, 1992;Forja and Gómez-Parra, 1998), but not on the characterization of the speciation of phosphorus in reactive phases in sediment.…”

Section: Introductionmentioning

confidence: 99%

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Accumulation of phosphorus in coastal marine sediments: relationship to benthic and diffusive fluxes

Ponce¹,

Ortega²,

Forja³

et al. 2010

Sci. Mar.

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SUMMARY: Sedimentary phosphorus was characterized in sediment cores from 3 coastal ecosystems of the Gulf of Cadiz. High spatial variability was observed in total phosphorus (from 445 to 20291 µg g.sed -1 ) and in the other phosphorus phases studied. This variability correlates with the proximity of the 10 sampling stations to sources of urban and/or industrial effluent in the zone. The benthic and diffusive fluxes were measured concurrently with sediment collection at these stations. The measured values of benthic fluxes range between -14 and 6 mmol m -2 d -1 . Generally, stations that showed increased interstitial phosphate concentrations with increasing depth were characterized by positive values in phosphate benthic fluxes and by high percentages of reactive forms of sedimentary phosphorus. Negative benthic fluxes were associated with stations receiving more anthropogenic matter, which showed progressively decreasing phosphate concentrations in the interstitial water with depth. In these anthropogenic areas, the non-reactive forms of phosphorus (those associated with ferric oxyhydroxide and authigenic carbonate fluorapatite) are abundant, and reach values exceeding 75% of total phosphorus in sediment.Keyworks: benthic fluxes, diffusive fluxes, phosphorus, sediment, Gulf of Cadiz, sequential extraction. RESUMEN: Acumulación de fósforo en sedimentos marinos costeros: relación con flujos bentónicos y difusivos. -Se ha realizado la caracterización del fósforo sedimentario en 3 ecosistemas costeros del Golfo de Cádiz. Se ha encontrado una alta variabilidad espacial (desde 445 hasta 20291 µg g.sed -1 ) en la cantidad de fósforo total, y en las otras fases de fósforo estudiadas. Esta variabilidad se correlaciona con la proximidad de las 10 estaciones de muestreo a las fuentes de efluentes urbanos e industriales de la zona. Los flujos difusivos y bentónicos fueron también medidos en las mismas estaciones de forma simultánea. Los valores de los flujos bentónicos están comprendidos entre -14 y 6 mmol m -2 d -1 . Generalmente, un incremento de la concentración de fosfato en el agua intersticial con la profundidad se notó en aquellas zonas en las que se encontraron valores positivos de los flujos y que presentan altos porcentajes de las formas reactivas de fósforo en el sedimento. Por otra parte, los flujos bentónicos negativos parecen estar asociados a las estaciones que reciben más material de origen antropogénico y están relacionados con la disminución progresiva de las concentraciones de fosfato en el agua intersticial. En esas áreas antropogénicas, las formas no reactivas del fósforo (asociadas a oxihidróxidos de hierro y a carbonato fluorapatito autigénico) son las más abundantes, y llegan a alcanzar valores que superan el 75% del fósforo total del sedimento.Palabras clave: flujos bentónicos, flujos difusivos, fósforo, sedimento, Golfo de Cádiz, extracción secuencial.

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Section: Diffusive and Benthic Fluxesmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Accumulation of phosphorus in coastal marine sediments: relationship to benthic and diffusive fluxes

Ponce¹,

Ortega²,

Forja³

et al. 2010

Sci. Mar.

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“…Sediment bioturbation, burrowing, and irrigation affect the vertical distribution of organic matter within sediments, increase exposure of sediment to oxygen, enhance the exchange of solutes between sediment and overlying water, and, therefore, influence a variety of aerobic and anaerobic microbial processes (Aller 1982, Aller & Aller 1998. In shallow nearby sediments of the Bay of Cádiz, Forja & Gómez-Parra (1998) found that macrofauna affected the top 10 to 15 cm of sediment, significantly enhancing benthic fluxes of inorganic carbon and nutrients. However, the PCA failed to show any significant relationship between total macrofaunal abundance or biomass and organic matter mineralization and nutrient benthic fluxes.…”

Section: Influence Of Macrofauna On Nutrient Regenerationmentioning

confidence: 99%

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Ferrón

Alonso-Pérez²,

Anfuso³

et al. 2009

Mar. Ecol. Prog. Ser.

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Benthic fluxes of nutrients and dissolved nitrous oxide (N 2 O) were determined by benthic chamber incubations in 2 regions on the northeastern near-shore continental shelf of the Gulf of Cádiz (depth range: 8 to 34 m), one off the Guadalquivir River mouth and the other in the Bay of Cádiz and its neighboring shelf. In total, 25 in situ benthic chamber incubations were performed dur- , accounted on average for <1% of total inorganic nitrogen fluxes. The regeneration of NH 4 + and Si(OH) 4 was mainly influenced by organic carbon oxidation rates and bulk organic carbon in surface sediments, whereas HPO 4 2 -regeneration was mostly influenced by bottom water oxygen concentration and water depth. Denitrification was estimated to account for between 9 and 13% of organic matter remineralization and for a loss of between 57 and 67% of potentially recyclable nitrogen. Overall, benthic remineralization was estimated to degrade about 47% of overlying primary production, supplying about 15 and 12% of the phytoplankton N and P requirements, respectively. This highlights the importance of benthic organic matter remineralization on the biogeochemistry of the northeastern continental shelf of the Gulf of Cádiz.

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“…Adjustable submersible pumps connected to waterproof batteries mixed the water inside the enclosures. As metabolic responses depend on hydrodynamics (Forja and Gomez-Parra 1998), water flow in each enclosure was adjusted to the minimum value (2 L min 21 ) to allow stable measurements. Incubations without mollusks were performed as a reference treatment.…”

Section: Methodsmentioning

confidence: 99%

Respiration, calcification, and excretion of the invasive slipper limpet, Crepidula fornicata L.: Implications for carbon, carbonate, and nitrogen fluxes in affected areas

et al. 2006

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We measured in situ respiration, calcification, and excretion of the slipper limpet, Crepidula fornicata L., and considered both seasonal variations and individual size, to estimate the effects of this exotic species on annual budgets of carbon, carbonate, and nitrogen in the Bay of Brest (France). Respiration, calcification, and excretion rates changed significantly with size and season. Oxygen consumption varied from 6 to 63 mmol O 2 g 21 ash-free dry weight (AF dry wt) h 21 , which corresponded to a carbon dioxide release that ranged from 2 to 44 mmol CO 2 g 21 AF dry wt h 21 . Maximum respiration rates were observed in summer, and minimum rates were observed in winter. CaCO 3 production ranged from 24 to 44 mmol CaCO 3 g 21 AF dry wt h 21 from winter to summer, respectively. Ammonium release varied from 0.7 to 3.1 mmol NH þ 4 g 21 AF dry wt h 21 , with the highest excretion rate in spring. Total carbon release by C. fornicata in highly colonized zones in the Bay of Brest averaged 290 g C m 22 yr 21 , carbonate production was ,515 g CaCO 3 m 22 yr 21 , and nitrogen production by ammonium excretion was ,25 g N m 22 yr 21 . C. fornicata respiration and excretion account for 55% and 85% of the benthic community respiration and excretion, respectively. These results illustrate the importance of this invasive species to carbon and nitrogen cycles, including biogenic carbonate production, in coastal ecosystems.

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Measuring nutrient fluxes across the sediment-water interface using benthic chambers

Cited by 50 publications

References 26 publications

Accumulation of phosphorus in coastal marine sediments: relationship to benthic and diffusive fluxes

Accumulation of phosphorus in coastal marine sediments: relationship to benthic and diffusive fluxes

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Respiration, calcification, and excretion of the invasive slipper limpet, Crepidula fornicata L.: Implications for carbon, carbonate, and nitrogen fluxes in affected areas

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