Oxygen Consumption and Dissolved Inorganic Nutrient Production in Marine Coastal and Shelf Sediments of the Middle Atlantic Bight

Florek, Robert J.; Rowe, Gilbert T.

doi:10.1002/iroh.19830680106

Cited by 52 publications

(22 citation statements)

References 57 publications

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“…Kelderman 1984). Our values for ammonia release in the dark (0.5 mm01 NH4 m-' d-' in aquaria without added nutrients) lie well within the range of those reported by Boynton & Kemp (1985) and Nowicki & Nixon (1985), but are somewhat lower than rates reported by Florek & Rowe (1983). Boynton & Kemp found that in Chesapeake Bay the ammonia release was highest in summer, max.…”

Section: Discussionsupporting

confidence: 85%

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Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Sundbäck¹,

Granéli²

1988

Mar. Ecol. Prog. Ser.

146

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The importance of microphytobenthos as a regulator of the flux of inorganic phosphorus and nitrogen between sediment and water was investigated in a laboratory study. Sediment from the SE Kattegat was incubated in nutrient-enriched seawater during exposure to varying light quantities (0, 5, 10, and 30 pE m-' S-'). Microphytobenthos growth was limited by both inorganic nutrients and light quantity. When exposed to no-light conditions, chlorophyll a content of the sediment decreased only slightly and remained at an almost constant level (50 to 55 mg m-2) for several weeks, and increased rapidly when exposed to light. A relationship was observed between light quantity and the rate and direction of the flux of NH: and PO:-, but not NO;, between the sediment and overlying water The indirect influence of the microphytobenthos on the nutrient flux, i.e. by changes in the oxygen concentration, seemed more important than the direct effect by uptake by the algae. The rate of release of phosphate from the sediment exposed to darkness was up to 0.2 mm01 PO4 m-2 d-l The maximum mean rate of ammonia release was 1.6 mm01 m-' d-' in the dark and ca 0.1 mm01 m-2 d-' at 5 yE S-'. When the amount of light was 3 10 pE m-' S-', the microbenthic activity (oxygen production and increased nutrient requirements) prevented the release of PO4 and NH4 from the sediment.

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Section: Discussionsupporting

confidence: 85%

“…While nitrate fluxes are often directed towards the sediment because of denitrification, at least when there are high nitrate concentrations in bottom-near waters (as in our experiment), there is usually a net outflow of ammonia from sediments (Florek & Rowe 1983, Boynton & Kemp 1985, Nowicki & Nixon 1985.…”

Section: Discussionmentioning

confidence: 68%

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Sundbäck¹,

Granéli²

1988

Mar. Ecol. Prog. Ser.

146

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“…The enhancement of these two components may result in the lower permeation of oxygen, increased microbial oxygen uptake/demand and a subsequent build up of toxic by-products (e.g. ammonia, dissolved sulphide) (Florek & Rowe, 1983;Santschi et al, 1990;Fenchel et al, 1998). This can lead to impoverished benthic communities dominated by a few opportunistic species, as supported by the low MI values and the dominance of rstrategist genera at site B.…”

Section: Discussionmentioning

confidence: 99%

The nematode assemblage as a tool for the assessment of marine ecological quality status: a case-study in the Central Adriatic Sea

et al. 2013

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Free-living nematodes are efficiently used as bio-indicators of anthropogenic disturbance in marine ecosystems. Among various criteria, functional traits may represent useful tools for monitoring environmental impact in coastal areas. A study of nematode assemblages was carried out in three locations of the Central Adriatic Sea (Italy), one at the mouth of the Foglia River (Baia Flaminia) and two enclosed in the Monte San Bartolo Natural Park (Monte Brisighella and Fiorenzuola di Focara). Taxonomic composition and the functional traits of the nematode assemblage revealed a possible influence of the organic load of the Foglia River. Biotic data, as well as environmental parameters, suggested a particularly negative impact of the river on the assemblage at Baia Flaminia. Here, the increasing impact of the river led to a rise in the relative abundance of r-strategist genera like Chromadora, Sabatieria and Viscosia. Poor ecological conditions were also present at Brisighella, where the river might exert its influence due to the presence of long shore currents. In contrast, the results revealed that the best ecological quality was at Fiorenzuola di Focara, where the impact of anthropogenic activities was generally irrelevant. This study documents how nematodes can be used as an early warning indicator with which to monitor the health quality of vulnerable littoral areas.

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“…The regeneration of nutrients and fluxes of gases at the sediment-water interface has often been compared to the typical elemental composition of organic matter mainly originating from phytoplankton in the sea as described by Redfield (1934) (Nixon et al 1976, Florek & Rowe 1983. However, detritus derived from macrophytes may have a different elemental composition to planktonic detritus, which may influence the regeneration processes.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spartina detritus enrichment on exchange of nutrients between sediment and water in an intertidal area of Bay of Fundy

Andersen¹

1986

Mar. Ecol. Prog. Ser.

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The influence of Spartina alterniflora detritus on exchange of nitrate + nitrite, ammonia, and phosphate between sediment and water was studied after burial of plant litter in a muddy intertidal sediment in Cobequid Bay, Bay of Fundy. The enriched area in general showed higher flux rates than the control area. Dissolved inorganic nitrogen (DIN) flux was dominated by ammonium. Ammonium was normally only released from the sediment and maximum release rates were 300 and 180 pm01 NH:-N m-2 h-' in the enriched and control plot, respectively. In contrast, both uptake and release of nitrate + nitrite by the sediment was found; maximum uptake rates were 43 and 25 and release rates 98 and 51 pm01 NO;+NO;-N m-2 h-' in the enriched and control plot, respectively. Very low phosphate fluxes were observed in both plots. Initial C/N and C/P ratios of the Spartina material were 24 : 1 and 117 : 1, respectively. The C/N ratio showed a n initial decrease followed by a slow increase. The C/P ratio showed the opposite pattern. Only 8.8 % of the N and 2.7 % of the P initially added to the sediment remained after 4 mo decomposition as Spartina material (> 1 mm). The loss of N and P was larger than the cumulated release of DIN and DIP to the overlying water; thus 33 % of the N and 72 % of the P lost from the particulate detritus was retained in the sediment or lost in other ways. Flux rates of nitrate and ammonium in the enriched area were the only variables correlated. Exchange rates of nutrients were not correlated with in situ temperature. However, laboratory incubations at 7.5 and 17.5 "C showed Qlo-values of up to 10, indicating that short term changes of temperature in the field, e.g. die1 variation, may be significant. The nutrient concentration of the water was low during the summer period and increasing during the fall.

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Oxygen Consumption and Dissolved Inorganic Nutrient Production in Marine Coastal and Shelf Sediments of the Middle Atlantic Bight

Cited by 52 publications

References 57 publications

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

The nematode assemblage as a tool for the assessment of marine ecological quality status: a case-study in the Central Adriatic Sea

Influence of Spartina detritus enrichment on exchange of nutrients between sediment and water in an intertidal area of Bay of Fundy

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