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Title

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

AuthorsForja, Jesús M.; Gómez-Parra, Abelardo
KeywordsBenthic chamber
Benthic regeneration
Nutrient fluxes
Diffusive fluxes
Macrofaunal irrigation
Sediment-water interface
Coastal ecosystem
Issue Date9-Apr-1998
PublisherInter Research
CitationMarine Ecology Progress Series 164: 95-105 (1998)
AbstractThis paper presents a simple model to determine the benthic fluxes of matter across the sediment-water interface when a benthic chamber is used. The model is based on accepting that the limiting step for the overall rate of transfer while the chamber is in position is the diffusion through the diffusive boundary layer (DBL) overlying the sediment, and it assumes that this rate is necessarily affected by the procedure employed to measure the flux. Alteration of the benthic fluxes due to the action of macrofauna is included in the model and, operatively, is expressed in terms of a reduction in the thickness of the DBL between the sediment and the water. If the diffusive fluxes are determined simultaneously with the benthic chamber experiments, a value can be estimated for the thickness of the 'stagnant film'. Owing to the assumptions made and to the micro-heterogeneities of the sediment, this thickness can be considered to have both an operative and a statistical meaning, with respect to the entire surface area covered by the chamber. The values calculated in the Bay of Cádiz (SW Spain) vary between 0.36 and 0.71 mm, which are in agreement with measurements of this film made by different techniques in other littoral ecosystems. However, the values of the in situ fluxes estimated using this model and by other established procedures described in the literature can differ by more than 50%, for the same experiment, in strongly irrigated zones.
Description11 páginas, 8 figuras, 2 tablas.
Publisher version (URL)http://www.int-res.com/articles/meps/164/m164p095.pdf
URIhttp://hdl.handle.net/10261/48255
DOI10.3354/meps164095
ISSN0171-8630
E-ISSN1616-1599
Appears in Collections:(ICMAN) Artículos
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