Sediment–Water Exchange of Nutrients in the Intertidal Zone of the Humber Estuary, UK

Mortimer, Robert J.G.; Krom, Michael D.; Watson, Peter; Frickers, P.E.; Davey, J. T.; Clifton, R.J.

doi:10.1016/s0025-326x(99)00053-3

Cited by 71 publications

(44 citation statements)

References 51 publications

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“…Otherwise, in the Ria of Ortigueira the thicker oxic-suboxic sediment layer in spring act as retention to the upward diffusive phosphate flux while at summer this layer is reduced due to the increase of organic matter mineralization rates (Ishikawa and Nishimura, 1989;Falcão et al, 2006). Phosphate and silicate diffusive fluxes were low compared with the fluxes of important river-dominated estuaries (Watson et al, 1993;Mortimer et al, 1999), but similar to those found by Al-Rousan et al (2004) in coral reef along the Jordanian coast of the Gulf of Aqaba.…”

Section: Nutrient Fluxes Between Sediment and Overlying Water At Submsupporting

confidence: 64%

Exchange of nutrients across the sediment–water interface in intertidal ria systems (SW Europe)

Ospina-Álvarez

Caetano

Vale

et al. 2014

Journal of Sea Research

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Concentrations of nitrate, nitrite, ammonium, phosphate and silicate were determined in river water, tidal water that floods the intertidal sediment (flooding water) and pore water of those sediments in the Northern Galician Rias of Ortigueira and Viveiro (NW Iberian Peninsula). The field surveys were done in the productive seasons of spring and summer 2008. Short-sediment cores and tidal flooding water were sampled at the intertidal area during the first 20 minutes that the tide inundates the sampling site. Nutrient fluxes of rivers (Lourido and Landro) flowing into the rias were in the order of H 4 SiO 4 > NO . Nutrients inputs from those rivers were low relative to the nutrient discharge of the entire coastal area. Striking changes of nutrient concentrations in flooding and pore waters of intertidal sediments were observed in the short periods of tidal inundation. Nutrient fluxes driven by molecular diffusion and tide-induced transport across the sediment-water interface were quantified and compared to the nutrient river contribution. Diffusive fluxes ranged from 9.3 to 13.7 nmol·cm -2 ·d -1 for nitrate and nitrite, -1.32 to 30.1 nmol·cm -2 ·d -1 for ammonium, -0.01 to 0.49 nmol·cm -2 ·d -1 for phosphate, and -13.2 to 0.2 nmol·cm -2 ·d -1 for silicate. Tide-induced transport always exceeded diffusive fluxes, with differences reaching up to four orders of magnitude for silicate. The overall results of this study emphasize the relevance of tidal water movement in promoting the sediment-water exchange of nutrients in intertidal sub-ecosystems.

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Section: Nutrient Fluxes Between Sediment and Overlying Water At Submsupporting

confidence: 64%

Exchange of nutrients across the sediment–water interface in intertidal ria systems (SW Europe)

Ospina-Álvarez

Caetano

Vale

et al. 2014

Journal of Sea Research

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“…Pre-event concentration was already high however, and post-event decline was more gradual than for PO 4 . Suspension of sediments is known to play an important role in NH 4 flux in other systems (Reddy et al 1996, Sloth et al 1996, Mortimer et al 1998, Morin & Morse 1999. Disturbance of interstitial waters is probably responsible for the dramatic increase in NH 4 concentrations observed at the onset of the event.…”

Section: Discussionmentioning

confidence: 99%

Wind events and benthic-pelagic coupling in a shallow subtropical bay in Florida

Lawrence¹,

Dagg²,

Liu³

et al. 2004

Mar. Ecol. Prog. Ser.

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During the winter months (December to April), the SE United States is influenced by continental air masses from the north or northwest which pass at approximately 4 to 7 d intervals. These wind events can cause suspension of bottom sediments in Florida Bay. Over a 9 d period in March 2001, we examined the effects of a wind-mixing event on the pelagic system within the NW part of Florida Bay, where water depth is 2 to 3 m. This event caused significant suspension of bottom materials, large increases in NH 4 and PO 4 , smaller increases in NO 3 +NO 2 and Si(OH) 4 , a decrease in microzooplankton abundance, and an increase in benthic copepods in the water column. As wind speeds declined, there was a rapid decline in PO 4 concentration, gradual declines in suspended sediment, NH 4 and Si(OH) 4 , an increase in chlorophyll a (chl a) stock, an increase in phytoplankton growth and productivity, an increase in microzooplankton grazing rate, and a settling of the benthic harpacticoid community. No grazing response was apparent in the mesozooplankton community. The wind event clearly injected dissolved and particulate benthic materials into the water column, where they directly stimulated the bacterioplankton, phytoplankton and microzooplankton communities within 1 to 2 d after the event. The water column was strongly net heterotrophic at this time, suggesting a large input of dissolved organic matter from the bottom. Stimulation of the pelagic food web continued at least until we completed our study 6 d after the event. By the end of our study, the water column was net autotrophic.

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“…Sediment-water silica fluxes are normally assumed to be straightforward, with release due to dissolution of siliceous material, controlled by temperature (e.g. Hammond et al, 1985, Mortimer et al, 1998 and consequent diffusion in the water. However, calculated diffusive silica fluxes deviate from measured fluxes (Callender and Hammond, 1982;Mortimer et al, 1998), and the relatively low apparent rate constants obtained from pore water data cannot explain the observed fast dissolution kinetics .…”

Section: Diffusive and Advective Transportmentioning

confidence: 99%

“…Hammond et al, 1985, Mortimer et al, 1998 and consequent diffusion in the water. However, calculated diffusive silica fluxes deviate from measured fluxes (Callender and Hammond, 1982;Mortimer et al, 1998), and the relatively low apparent rate constants obtained from pore water data cannot explain the observed fast dissolution kinetics . Some diagenetic models invoke biogenic opal fractions (Wong and Grosch, 1978;Dixit and Van Capellen, 2002) and decreasing dissolution rate coefficient with advancing early diagenesis (McManus et al, 1995), or seek for solutions in Al content and specific surface area of biosiliceous fragments (Dixit et al, 2001).…”

Section: Diffusive and Advective Transportmentioning

confidence: 99%

“…Some diagenetic models invoke biogenic opal fractions (Wong and Grosch, 1978;Dixit and Van Capellen, 2002) and decreasing dissolution rate coefficient with advancing early diagenesis (McManus et al, 1995), or seek for solutions in Al content and specific surface area of biosiliceous fragments (Dixit et al, 2001). Other authors, however, have suggested the importance of bioturbation (Berner, 1980;Meile et al, 2005), resuspension (Mortimer et al, 1998), bioirrigation (Aller, 1965;Mortimer et al, 1998), advection and subsurface circulation patterns ( Vanderborght et al, 1977) in diagenetic equations.…”

Section: Diffusive and Advective Transportmentioning

confidence: 99%

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Spatiotemporal aspects of silica buffering in restored tidal marshes

Jacobs

Struyf

Maris

et al. 2008

Estuarine, Coastal and Shelf Science

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Losses of pelagic diatom production resulting from silica limitation have not only been blamed for toxic algal blooms, but for the reduction in ability of coastal food webs to support higher trophic levels. Recent research has shown the importance of advective seepage water fluxes of dissolved silica (DSi) from freshwater marshes to pelagic waters during moments of riverine Si-limitation. In this study, we investigated the potential impact of recently installed new tidal areas along the Schelde estuary, located in former polder areas and characterized by so-called controlled reduced tidal regimes (CRT). Nine mass-balance studies were conducted in a newly constructed CRT in the freshwater Schelde estuary. During complete tidal cycles both DSi and amorphous silica (ASi) concentrations were monitored at the entrance culverts and in different habitats in the marsh. A swift DSi-delivery capacity was observed despite the shifted spatiotemporal frame of exchange processes compared to reference marshes. As silica-accumulating vegetation is not yet present, and difference with reference marshes' deliveries is surprisingly small, we indicate diatomaceous debris and phytoliths to be the main silica source. Although further research is necessary on the driving forces of the different processes involved, restoration of former agricultural areas under CRT-regime provide the potential to buffer silica in the estuary.

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Sediment–Water Exchange of Nutrients in the Intertidal Zone of the Humber Estuary, UK

Cited by 71 publications

References 51 publications

Exchange of nutrients across the sediment–water interface in intertidal ria systems (SW Europe)

Exchange of nutrients across the sediment–water interface in intertidal ria systems (SW Europe)

Wind events and benthic-pelagic coupling in a shallow subtropical bay in Florida

Spatiotemporal aspects of silica buffering in restored tidal marshes

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