Sediment Oxygen Consumption and Benthic Nutrient Fluxes on the Louisiana Continental Shelf: A Methodological Comparison

Miller‐Way, Tina; Boland, Gregory S.; Rowe, Gilbert T.; Twilley, Robert R.

doi:10.2307/1352749

Cited by 46 publications

(20 citation statements)

References 27 publications

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“…However, in comparison to respiration rates reported for northern hemisphere coastal embayments at similar latitudes, rates in Moreton Bay were slightly lower (e.g. annual means: 2344 µmol O 2 m -2 h -1 in Ochlockonee Bay [Seitzinger 1987], 1432 µmol O 2 m -2 h -1 in Mobile Bay , and 2682 µmol O 2 m -2 h -1 in Fourleague Bay [Miller-Way et al 1994]). This discrepancy may be explained in part by higher sediment OC and chlorophyll concentrations at sites measured in the northern hemisphere systems, due primarily to greater freshwater inputs and nutrient loadings to these systems.…”

Section: Benthic Metabolism and Organic Mattercontrasting

confidence: 61%

Benthic metabolism and nitrogen cycling in a sub-tropical coastal embayment: spatial and seasonal variation and controlling factors

Ferguson¹,

Eyre²,

Emtage³

et al. 2007

Aquat. Microb. Ecol.

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Spatial and seasonal variation in sediment properties, benthic metabolism (O 2 and TCO 2 fluxes) and nitrogen (N) cycling (dinitrogen gas [N 2 ], dissolved inorganic N [DIN] and organic N [DON] fluxes) in western Moreton Bay, Queensland, Australia, were investigated using spatially intensive sediment core incubations. Principal component analysis (PCA) showed that variation in the dataset was best explained by 2 components representing heterotrophic and autotrophic processes respectively. Heterotrophic respiration was most closely associated with sediment chlorophyll c, indicating that benthic labile organic carbon (OC) was dominated by phytodetritus (diatoms) and viable phytoplankton cells. The supply of this OC to the sediments was controlled by a combination of phytoplankton biomass and hydrodynamic circulation patterns. Autotrophic benthic production across the study area was closely associated with light attenuation, which varied according to depth and turbidity. DIN fluxes were most closely associated with the autotrophic component, indicating the importance of N assimilation by benthic microalgae. N 2 fluxes were negatively associated with the heterotrophic component, most likely due to the increasing inhibition of coupled nitrificationdenitrification and/or an increase in N fixation as OC loading increases. DON fluxes dominated N fluxes overall and were controlled by autotrophic/heterotrophic DON production and heterotrophic DON consumption. Cluster analysis identified 3 basic states that describe the spatial and temporal variation in benthic processes across western Moreton Bay: reactive nearshore sediments underlying phytoplankton bloom centres (Cluster 1), less reactive sediments further offshore which receive a lesser supply of phytodetritus (Cluster 2) and a new suite of sediment properties, metabolism and N fluxes at the nearshore sites following a post-flood phytoplankton bloom (Cluster 3).

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Section: Benthic Metabolism and Organic Mattercontrasting

confidence: 61%

Benthic metabolism and nitrogen cycling in a sub-tropical coastal embayment: spatial and seasonal variation and controlling factors

Ferguson¹,

Eyre²,

Emtage³

et al. 2007

Aquat. Microb. Ecol.

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“…Though in-situ incubation has been preferred over whole-core incubation in some cases (e.g., Hammond et al, 1985;Devol and Christiansen, 1993;Jahnke et al, 2000;Berelson et al, 2003), reliable flux data have been obtained through the latter method (e.g., Rysgaard et al, 1998;Hopkinson et al, 2001;Jahnke et al, 2005;Faganeli and Ogrinc, 2009;Lehrter et al, 2012) over continental shelves. Comparative studies such as those carried out by Miller-Way et al (1994), Hammond et al (2004) and Woulds et al (2009) show that benthic fluxes measured through the chamber/lander and the intact-core incubation method in shallow marine environments such as continental shelves are similar in magnitude and direction with minimal systematic difference, even under anaerobic conditions, with only few exceptions. Apart from NO Miller-Way et al (1994) did not observe significant variability of nutrient fluxes between the in-situ and ex-situ incubation over the Louisiana shelf.…”

Section: Incubation Methodsmentioning

confidence: 92%

“…Comparative studies such as those carried out by Miller-Way et al (1994), Hammond et al (2004) and Woulds et al (2009) show that benthic fluxes measured through the chamber/lander and the intact-core incubation method in shallow marine environments such as continental shelves are similar in magnitude and direction with minimal systematic difference, even under anaerobic conditions, with only few exceptions. Apart from NO Miller-Way et al (1994) did not observe significant variability of nutrient fluxes between the in-situ and ex-situ incubation over the Louisiana shelf. They attributed these differences to the increase in O 2 in the overlying water upon core recovery rather than to the inherent differences in two methodologies.…”

Section: Incubation Methodsmentioning

confidence: 92%

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

et al. 2014

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Abstract. The western Indian continental shelf is one of the most productive coastal systems of the world ocean. This system experiences extreme changes in its oxygen regime, being normoxic from November to May and suboxic (denitrifying)/anoxic from June to October, owing to the biogeochemical response to cyclical monsoonal influence. In order to understand the impact of the seasonally varying oxygen regime on benthic mineralization, nutrient exchange and, in turn, on the shelf ecosystem, we carried out the first ever intact-core incubations during two contrasting seasons -spring intermonsoon and fall intermonsoon (late southwest monsoon) at a 28 m-deep fixed site on the inner shelf off Goa, dominated by fine-grained cohesive sediments. The results showed that incomplete sediment oxygen consumption (SOC) occurred during April as opposed to the complete SOC and subsequent sulfide flux observed in the fall intermonsoon incubations. The sediments acted as a perennial net source of DIN (dissolved inorganic nitrogen i.e. NO Slow oxidation of organic carbon (C org ) under anoxia, lower temperature and reduced benthic faunal activity appeared to decrease benthic mineralization by 25 % as suggested by the drop in the C org oxidation rate from 63.8 mmol C m −2 d −1 in April to 47.8 mmol C m −2 d −1 in October. This indicated a higher preservation of C org during the late southwest monsoon. Sediment porosity, C org content and nutrients did not show significant variations from April to October. Porewaters were found to be enriched with NH

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“…The core tubes were then sealed with a rubber bung and left in the dark for a period ranging from two to four hours without stirring the overlying water. This because of the occurrence of an easily resuspendable thick nepheloyd layer in the surficial sediment (Miller-Way et al ., 1994 ;Rizzo et al ., 1992) . Oxygen, ammonium and reactive dissolved phosphorus were determined at zero time and at the end of the incubation period .…”

Section: Bassin D'arcachonmentioning

confidence: 99%

Benthic oxygen respiration, ammonium and phosphorus regeneration in surficial sediments of the Sacca di Goro (Northern Italy) and two French coastal lagoons: a comparative study

et al. 1996

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During 1994 net sediment-water fluxes of oxygen, ammonium and inorganic phosphorus as well as sediment profiles of organic matter, nitrogen, phosphorus and iron were determined in three shallow eutrophic environments . Investigations were conducted monthly from March to December at five stations in the Sacca di Goro (Po River Delta, Italy). In the late summer, samples were collected from a single site in the Prevost lagoon (French Mediterranean coast) and three stations in the Bassin d'Arcachon (French Atlantic coast) . In the Sacca di Goro, water-sediment exchanges of 02, NH4 and p03-were estimated by means of core incubation in the dark . Benthic fluxes for the French lagoons were in part determined experimentally using benthic chambers and in part from the literature .In general in the Sacca di Goro the highest oxygen uptake and nutrient release rates were found at the central sites, affected by macroalgal growth . At the sampling site adjacent to the freshwater inlet, sediment-water exchanges were principally influenced by tidal activity. In terms of organic matter and nutrient levels, sediments from the Sacca di Goro and from the Prevost lagoon, both colonised by the floating macroalga Ulva rigida C . Agardh, were similar. Sediments from the inner sheltered site in the Bassin d'Arcachon, invaded by the rooted macrophyte Ruppia cirrhosa (Pet .) Grande, showed the highest total N and P content (363 ± 157 pmol N cm -3 and 15 ± 2 pmol P cm -3as average values in the top 10 cm of sediment), but were low in pore water ammonium and orthophosphate probably due to the high sequestering capacity of the system and/or efficient coupling between bacterial nutrient regeneration and assimilation by the plant roots . In addition the outer tidal stations in the Bassin d'Arcachon, invaded by rooted macrophytes, were low in pore water nutrients . A different trend was evident in the Prevost lagoon where the concentrations of exchangeable inorganic phosphorus and ammonium were appreciable (0 .28 ± 0 .07,umol P cm -3 and 2 .4 ± 1 .4 tmol N cm -3 as average values in the top 10 cm of sediment) . High amounts of dissolved organic nitrogen were found in the pore water at all the sites investigated showing the key role of the organic nitrogen in the recycling of nitrogen in these systems . The hypothesis that iron is a key factor in controlling phosphorus release is discussed since the Sacca di Goro, which is subject to dystrophic crises, is richer in iron than the Bassin d'Arcachon, which is a more buffered system .

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Sediment Oxygen Consumption and Benthic Nutrient Fluxes on the Louisiana Continental Shelf: A Methodological Comparison

Cited by 46 publications

References 27 publications

Benthic metabolism and nitrogen cycling in a sub-tropical coastal embayment: spatial and seasonal variation and controlling factors

Benthic metabolism and nitrogen cycling in a sub-tropical coastal embayment: spatial and seasonal variation and controlling factors

Benthic mineralization and nutrient exchange over the inner continental shelf of western India

Benthic oxygen respiration, ammonium and phosphorus regeneration in surficial sediments of the Sacca di Goro (Northern Italy) and two French coastal lagoons: a comparative study

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