Inorganic nutrient and oxygen fluxes across the sediment–water interface in the inshore macrophyte areas of a shallow estuary (Lake Illawarra, Australia)

Qu, Wenchuan; Morrison, R.J.; West, R. J.

doi:10.1023/a:1024817912671

Cited by 25 publications

(25 citation statements)

References 16 publications

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“…Indeed, processes, such as mineralization, autotroph and heterotroph metabolic rates and biomass, molecular diffusion or DO concentration, are temperature dependent. Such a relationship between nutrient sediment -water exchange rates and temperature has previously been reported (Cowan & Boynton 1996, Qu et al 2003.…”

Section: Factors Influencing Seasonal Sediment -Water Fluxessupporting

confidence: 68%

“…Numerous studies have, therefore, highlighted the contribution of phytobenthos in improving water quality by absorption and reduction of nutrients (SotoJimenez et al 2003). Nutrient fluxes at the watersediment interface have been investigated for seagrass meadows (Eyre & Ferguson 2002, Qu et al 2003, Lepoint et al 2004), microalgal-dominated communities (Sundbäck et al 2000, An & Joye 2001, Cook et al 2004) and floating macroalgal-dominated communities in eutrophic environments (Viaroli et al 1996, Eyre & Ferguson 2002. However, despite their large distribution, the influence of slow-growing macroalgal-dominated communities on nutrient cycling is still poorly known.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Community metabolism in temperate maerl beds. II. Nutrient fluxes

Martin¹,

Clavier²,

Chauvaud³

et al. 2007

Mar. Ecol. Prog. Ser.

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Section: Factors Influencing Seasonal Sediment -Water Fluxessupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Community metabolism in temperate maerl beds. II. Nutrient fluxes

Martin¹,

Clavier²,

Chauvaud³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…Care was taken to preserve sediment structure during sampling and transport to the laboratory. A 200 mm high water column was left above the sediment core in order to obtain a sufficient O 2 and nutrient reservoir (Risgaard-Petersen & Rysgaard, 1995;Qu et al, 2003). For each sampling site, 12 cores were returned to the laboratory within 4 h. Two sets of three cores were collected for incubation flux measurements.…”

Section: Collection Of Samplesmentioning

confidence: 99%

“…Benthic fluxes were measured using incubation cores and techniques described by Dalsgaard et al (2000) and Qu et al (2003). Briefly, in the laboratory, the sediment cores were placed in an open tank filled with air-saturated lake water and maintained at temperatures similar to field conditions.…”

Section: Flux Measurements Using Incubated Coresmentioning

confidence: 99%

Diagenetic stoichiometry and benthic nutrient fluxes at the sediment–water interface of Lake Illawarra, Australia

Morrison

West

et al. 2005

Hydrobiologia

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Benthic flux measurements of O 2 , TCO 2 and inorganic nutrients were made at three stations (seagrass beds, shallow bare sand and deep mud) in Lake Illawarra (Australia) to compare the characteristics of diagenesis and benthic biogeochemical processes for different primary producers (seagrass or microphytobenthos, (MPB)) and/or sediment types (sand or mud).Seagrass beds exhibited the highest gross primary productivity while the lowest rates occurred at the deep mud station. At the shallow bare sand station only, the gross primary production (GPP) and respiration (R) were balanced, while at the other two stations, R exceeded GPP by as much as 2 fold, indicating more organic carbon was decomposed than produced at the time of sampling. In general, nutrient fluxes displayed typical diurnal variation.Organic carbon oxidation scenarios, evaluated by either calcium carbonate dissolution or sulfate reduction models, indicated that both models can represent organic matter mineralization. The difference of estimated total carbon oxidized in this lake using the two models was small, ranging from 0.2% at deep mud station to maximum of 21% at seagrass station. In addition, N 2 flux rates (net denitrification), estimated using carbon and nitrogen stoichiometry, were of similar magnitude as the rates estimated using LOICZ budget modeling or measured using the N 2 /Ar technique.Finally, a comparison of calculated diffusive fluxes and measured fluxes using incubation cores indicated that the results were of similar magnitude at the deep mud station, but the incubation cores fluxes were much higher than the calculated diffusive fluxes at the other two stations. This may have been caused by bioturbation or bioirrigation.

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“…Previous research has shown that nutrient efflux from the sediment can support 30 to 100% of the nutrient demand of benthic and pelagic algae (Gibbs et al 2005 and references within). These fluxes can support primary producers particularly when water column nutrients are low (Kamer 2004), and in turn, uptake by benthic primary producers can reduce the flux of nutrients from the sediment (Qu et al 2003). However, the laboratory-incubated cores or field chambers used in these and other studies (e.g.…”

Section: Hydrodynamic Activity Clearly Affects Nutrient Fluxmentioning

confidence: 99%

Physical and Biological Controls on Sediment and Nutrient Fluxes in a Temperate Lagoon

Lawson¹

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The lack of riverine inflow and shallow depths in coastal lagoons make the fluxes of nutrients and sediment across the sediment-water interface important controls on primary productivity in these systems. However, the physical-biological coupling that controls these fluxes is not fully understood. Experiments using a Gust microcosm were conducted on samples from Hog Island Bay, a shallow lagoon on the Delmarva Peninsula to determine the physical and biological controls on sediment and nutrient fluxes. Two of the dominant benthic primary producers, seagrass and macroalgae, have traditionally been considered sediment stabilizers. However, at low densities, these primary producers can increase sediment suspension by as much as 97% through flow diversion around isolated shoots or abrasion of the bed by saltating macroalgae. This increased sediment suspension during forcing events may make developing seagrass beds particularly susceptible to light limitation. These primary producers also affect erodibility of the sediment bed, with increased measured erodibility in the summer months attributed to trapping of fine material by dense macroalgal mats, as well as bioturbation by benthic fauna. While these benthic primary producers affect the physical process of sediment suspension, their growth and productivity may be affected by the interaction of physical forcing and nutrient flux. During forcing events, two mechanisms, desorption and porewater advection balanced by biological uptake, create ammonium fluxes an order of magnitude greater than those measured under low-flow conditions. However, these fluxes are likely not sustained and decrease quickly (on the order of hours). This pulsed increase in nutrient availability may create a competitive advantage for fast-growing ii species capable of surge uptake of nutrients, such as macroalgae and phytoplankton. In this sense, the timing of nutrient fluxes may be as important as the cumulative magnitude.iii

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Inorganic nutrient and oxygen fluxes across the sediment–water interface in the inshore macrophyte areas of a shallow estuary (Lake Illawarra, Australia)

Cited by 25 publications

References 16 publications

Community metabolism in temperate maerl beds. II. Nutrient fluxes

Community metabolism in temperate maerl beds. II. Nutrient fluxes

Diagenetic stoichiometry and benthic nutrient fluxes at the sediment–water interface of Lake Illawarra, Australia

Physical and Biological Controls on Sediment and Nutrient Fluxes in a Temperate Lagoon

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