Nutrient Fluxes, Porewater Profiles and Denitrification in Sediment Influenced by Algal Sedimentation and Bioturbation by Monoporeia affinis

Tuominen, Liisa; Mäkelä, Kalervo; Lehtonen, Kari K.; Haahti, Hannu; Hietanen, Susanna; Kuparinen, Jorma

doi:10.1006/ecss.1999.0492

Cited by 93 publications

(92 citation statements)

References 38 publications

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“…The N/P ratios of additional external N sources for Himmerfjärden are insufficient to reach a Redfield N/P ratio of 16 (Savage et al 2002). Since the DIN effluxes reported here are in the range of values from previous studies of Baltic sediments (Tuominen et al 1999), we attribute the low N/P ratios to the high PO 4 3-effluxes. To our knowledge, the DIP efflux measured at station H6 in October (97.2 lmol P m -2 h -1 ) is the highest reported for any Baltic Sea station to date.…”

Section: Stoichiometry Of N and P Regenerationcontrasting

confidence: 54%

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

et al. 2014

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The regulatory roles of temperature, eutrophication and oxygen availability on benthic nitrogen (N) cycling and the stoichiometry of regenerated nitrogen and phosphorus (P) were explored along a Baltic Sea estuary affected by treated sewage discharge. Rates of sediment denitrification, anammox, dissimilatory nitrate reduction to ammonium (DNRA), nutrient exchange, oxygen (O 2 ) uptake and penetration were measured seasonally. Sediments not affected by the nutrient plume released by the sewage treatment plant (STP) showed a strong seasonality in rates of O 2 uptake and coupled nitrification-denitrification, with anammox never accounting for more than 20 % of the total dinitrogen (N 2 ) production. N cycling in sediments close to the STP was highly dependent on oxygen availability, which masked temperaturerelated effects. These sediments switched from low N loss and high ammonium (NH 4 ? ) efflux under hypoxic conditions in the fall, to a major N loss system in the winter when the sediment surface was oxidized. In the fall DNRA outcompeted denitrification as the main nitrate (NO 3 -) reduction pathway, resulting in N recycling and potential spreading of eutrophication. A comparison with historical records of nutrient discharge and denitrification indicated that the total N loss in the estuary has been tightly coupled to the total amount of nutrient discharge from the STP. Changes in dissolved inorganic nitrogen (DIN) released from the STP agreed well with variations in sedimentary N 2 removal. This indicates that denitrification and anammox efficiently counterbalance N loading in the estuary across the range of historical and present-day anthropogenic nutrient discharge. Overall low N/P ratios of the regenerated nutrient fluxes impose strong N limitation for the pelagic system and generate a high potential for nuisance cyanobacterial blooms.

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Section: Stoichiometry Of N and P Regenerationcontrasting

confidence: 54%

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

et al. 2014

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“…Such temporal variability is rather common in manipulative experimental studies (e.g. Tuominen et al 1999, Michaud et al 2006). For example, Michaud et al (2005) noted significantly different oxygen uptake rates 20 and 28 d after the addition of the polychaete Nereis virens to experimental sediment microcosms.…”

Section: Discussionmentioning

confidence: 99%

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

Ekeroth¹,

Blomqvist²,

Hall³

2016

Mar. Ecol. Prog. Ser.

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Effects of bottom water oxygenation and macrofaunal colonisation on benthic fluxes of nitrogen (N), phosphorus (P) and silicon (Si) from long-term anoxic Baltic Sea bottom sediment were investigated. Sediment boxcosms from an anoxic site at 150 m depth in the open Baltic proper were incubated in the laboratory to follow the development of benthic nutrient fluxes during 74 d exposure to flow-through of oxygen-rich water. In contrast to traditional end-point experimental designs, our repeated measurement approach allowed for separation of transient and long-term effects of oxygenation and bioturbation on benthic nutrient recycling. The composition, but not the rate, of the benthic total dissolved N efflux changed by oxygenation from being dominated by NH 4 in situ to being mostly composed of NO 2 + NO 3 and dissolved organic N (DON) under oxic conditions. Oxygenation in the boxcosms decreased the benthic efflux of dissolved silicate (DSi) and essentially shut off the in situ flux of dissolved inorganic phosphorus (DIP). After 20 d of oxygenation, 2 bottom macrofauna taxa, the polychaete Marenzelleria spp. and the amphipod Monoporiea affinis, were introduced to a subset of the boxcosms. Bioturbation by either taxa increased the efflux of dissolved inorganic N (DIN), DON and DSi to the overlying water. The Prich benthic flux under in situ anoxic conditions roughly approached Redfield N:P stoichiometry after oxygenation in the sediment boxcosms. Upon addition of macrofauna, bioturbation generated even higher N:P flux ratios.

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“…Fe-P is an important contributor to TP and is the most bioavailable phosphorus fraction for algae (Bostrom et al, 1988). It can be digested by periphyton directly, delaying the process of eutrophication (Hisashi, 1983;Jensen and Thamdrup, 1993;Tuominen et al, 1999;Ruban et al, 2001a,b;Heisler et al, 2008;Yuan et al, 2014). A significant positive correlation (r > 0.899) between periphyton Fe-P and water column TP suggested that high levels of Fe-P in periphyton samples are an important early warning of pollution levels, as well as an important source of dynamic phosphorus for algae bloom events.…”

Section: Discussionmentioning

confidence: 99%

The role of periphyton in phosphorus retention in shallow lakes with different trophic status, China

2015

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Nutrient Fluxes, Porewater Profiles and Denitrification in Sediment Influenced by Algal Sedimentation and Bioturbation by Monoporeia affinis

Cited by 93 publications

References 38 publications

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

Seasonal oxygen, nitrogen and phosphorus benthic cycling along an impacted Baltic Sea estuary: regulation and spatial patterns

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

The role of periphyton in phosphorus retention in shallow lakes with different trophic status, China

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