Benthic nutrient remineralization and oxygen consumption in the coastal area of Hiroshima Bay

Seiki, Tohru; Izawa, Hirofumi; Date, Etsuji

doi:10.1016/0043-1354(89)90046-8

Cited by 41 publications

(12 citation statements)

References 53 publications

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“…SOC rates at Aqaba were also similar to those measured at a variety of different field sites, e.g. 13 to 38 mmol m -2 d -1 in Hiroshima Bay (Seiki et al 1989(Seiki et al , 1994) and 35 mmol m -2 d -1 in a coastal lagoon in the South Atlantic Bight (Marinelli et al 1998).…”

Section: Metabolism Of Carbonate and Silicate Sandssupporting

confidence: 53%

Benthic metabolism and degradation of natural particulate organic matter in carbonate and silicate reef sands of the northern Red Sea

Wild¹,

Rasheed²,

Jantzen³

et al. 2005

Mar. Ecol. Prog. Ser.

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The influence of natural particulate organic matter (POM) input on sedimentary oxygen consumption (SOC) in permeable carbonate and silicate sediments close to a coral reef was investigated in front of the Marine Science Station in Aqaba, Jordan (northern Red Sea). We conducted 7 in situ experiments in stirred benthic chambers. Without additional POM input, SOC rates were similar and not significantly different (p > 0.5) in carbonate and silicate sands, with average rates of 20 ± 4 (n = 10) and 16 ± 2 (n = 3) mmol O 2 m -2 d -1, respectively. Gross photosynthesis in the carbonate and silicate sands accounted for 15 to 23 mmol produced O 2 m -2 d -1, characterising both sands as largely independent of allochthonous carbon input. SOC of unamended carbonate sands showed no significant variation in 5 in situ experiments conducted within a period of 19 d. Addition of 2 energyrich sources of naturally occurring POM (coral mucus and clam eggs) resulted in significantly (p < 0.0001) increased SOC rates in the carbonate sands, but not in the silicate sands. Addition of a suspension containing high concentrations of zooxanthellae did not result in higher SOC in the carbonate sands, indicating that zooxanthellae cannot easily be degraded in reef sediments. Our results highlight the short cut between coral mucus production and degradation in the adjacent reef sands. Suspended particles are initially trapped by the cohesive mucus on the coral surface, and ensuing mucus strings sink to the seafloor at a short distance from the mucus-producing coral. Carbonate sands as porous filter systems obviously harbour more active heterotrophic microbial communities than silicate sands, and thus may constitute a major site of organic matter degradation in the reef ecosystem.

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Section: Metabolism Of Carbonate and Silicate Sandssupporting

confidence: 53%

Benthic metabolism and degradation of natural particulate organic matter in carbonate and silicate reef sands of the northern Red Sea

Wild¹,

Rasheed²,

Jantzen³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…Below this concentration fluxes were generally positive and much higher. In contrast to most other fluxes measured in this study, phosphate fluxes recorded from our 3 stations are in the same range as those reported from other productive ecosystems (Seiki et al 1989). Whereas carbon, oxygen and nitrogen transformations are controlled largely by biological processes, those of phosphorus are driven mostly by redox-dependent chemical reactions (Krom & Berner 1980, Klump & Martens 1981.…”

Section: Phosphate Fluxescontrasting

confidence: 48%

“…They are, however, at the low end of the range reported from other ecosystems (Seiki et al 1989). Mean fluxes at Stns 1 and 3 were similar during the oxic phase (ca 15 pm01 N m-' h-') whereas Stn 2 had values about 6 to 7 times lower.…”

Section: Ammonium Fluxesmentioning

confidence: 64%

“…SOC values, although low when compared to measurements from other parts of the world, and particularly from highly productive ecosystems (Seiki et al 1989), are within the range of measurements recorded from other parts of the Baltic Sea and the west coast of Sweden and Norway which characteristically lie between 500 and 1000 pm01 0 m-2 h-' (Table 3). Low SOC rates are directly related to the low temperatures which prevail in the Baltic Sea for most of the year, particularly in the deeper water, and to the supply of organic matter to sediments which is also low in our area.…”

Section: Oxygen Fluxesmentioning

confidence: 79%

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Sediment-water oxygen and nutrient exchanges along a depth gradient in the Baltic Sea

Koop¹,

Boynton²,

Wulff³

et al. 1990

Mar. Ecol. Prog. Ser.

117

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Bottom water and sediment characteristics and net sediment-water fluxes of oxygen, nitrogen, phosphorus and hydrogen sulphide were measured under oxic a n d experimentally induced anoxic conditions along a depth gradient (47 to 130 m) during summer in the Baltic proper. Temperature, salinity and dissolved nutrient concentrations (particularly phosphorus and nitrate) in bottom waters increased with depth while oxygen concentrations decreased sharply. Sediment organic content was much higher in sediments located beneath the permanent pycnocline (ca 65 m). Sediments at all stations were somewhat depleted in total N relative to total C (C.N -10). Sediments at the shallow station (47 m ) were highly enriched with total P relative to C or N (C:N P = 18:2:1) but were somewhat depleted in P at the deeper stations (C:N:P = 120:12:1). Under oxic conditions oxygen fluxes ranged from 214 to 777 pm01 0 m Q-' and decreased with depth. Phosphorus and nitrite fluxes were always very small and were directed either into or out of the sediments. Ammonium fluxes were small (1 to 30 pm01 N m-' h-') at all stations and did not exhibit a clear pattern with depth; 0 : N -N H , flux ratios were close to expected 'Redfield ratios' at the deep station (16:l) but were much higher (>55:1) at the shallower sites indicating that processes other than only an~monificatlon were taking place in sediments. Nitrate was always consumed by sediments (ca 1 to 16 ktn~ol N m-' h-') and fluxes were proportional to nitrate concentrations in the overlying water. Under anomc conditions there was a dramatic increase in P-PO4 fluxes (2 to 40 pm01 P m-' h-') and a smaller lncrease In N-NH, fluxes (14 to 35 pm01 N m-2 h ' ) . Large hydrogen sulphide fluxes (>40 pm01 S m-' h-') were observed in sediments from the deepest station only. Under oxic conditions sediment recycling of N and particularly of P were small compared to estimated rates of burial of P and burial plus denitrification of N However, under anoxic conditions, sediment recycling of both N and P were similar to or much greater than sedlment loss terms of burial and denitrification. Sediment regeneration under oxic conditions could supply 1 to 8 % and 0 to 2 % of estimated phytoplankton demand of N and P, respectively; under anoxic conditions 12 % of N and u p to 200 O/o of P demand could be met via sediment recycling.

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“…ORP is a measure of the relative degree of water oxidizability or reducibility. Wetzel et al [31] and Seiki et al [32] showed that the DO content in the overlying water is an important factor influencing ORP. As the data in Figure 4a shows, even when the culture tanks were sealed and not aerated, the existence of an air-filled space above the overlying water provided some air re-aeration through water surface entrainment caused by the circulating water flow, as indicated by the declining concentrations of DO over the first two days and the subsequent increases later in the experiment, which contrast markedly with the DO concentrations in the still-water tank, which declined monotonically throughout.…”

Section: Do and Orpmentioning

confidence: 99%

Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments

Cheng

Zhu

Wang

et al. 2016

Water

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Abstract:Sustaining good water quality in aquaculture ponds is vital. Without an aerator, the dissolved oxygen in ponds comes primarily from mass transfer at the water-ambient atmosphere interface. As sediment can seriously affect water quality, this study used indoor experiments to examine the nutrient (nitrogen and phosphorus) release mechanisms and fluxes from sediment in aquaculture ponds with moving water but no aeration. The results showed that the ammonia nitrogen (NH 3 -N) concentration in the overlying water was inversely proportional to flow velocity and that a higher flow velocity tended to result in a lower concentration in the overlying water, a steeper vertical gradient of concentration within the bed sediments, and a faster release rate from the sediments. The sediment disturbed by flowing water released more nitrate nitrogen (NO 3 -N) and nitrite nitrogen (NO 2 -N) into the overlying water and NO 2 -N could become oxidized into NO 3 -N. In still water, NO 3 -N was released gradually and some anaerobic NO 3 -N was nitrified into NO 2 -N. Phosphorus release from the sediments was controlled by the adsorption-desorption balance, with the phosphorus concentration in the overlying water dropping gradually to a steady value from its initial maximum. The relationship between NH 3 -N release flux and flow rate is described by a cubic function.

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Benthic nutrient remineralization and oxygen consumption in the coastal area of Hiroshima Bay

Cited by 41 publications

References 53 publications

Benthic metabolism and degradation of natural particulate organic matter in carbonate and silicate reef sands of the northern Red Sea

Benthic metabolism and degradation of natural particulate organic matter in carbonate and silicate reef sands of the northern Red Sea

Sediment-water oxygen and nutrient exchanges along a depth gradient in the Baltic Sea

Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments

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