Magnitude and variability of benthic and pelagic metabolism in a temperate coastal lagoon

McGlathery, Karen J.; Anderson, Iris C.; Tyler, Anna Christina

doi:10.3354/meps216001

Cited by 133 publications

(124 citation statements)

References 55 publications

(78 reference statements)

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“…They also suggest that primary producers may be ordered by decreasing production rates and nutrient consumptions as phytoplankton, Zostera noltii, Spartina maritima and macroalgae. This contradicts results obtained by other authors in shallow coastal lagoons and bays, where macrolgae production dominates over phytoplankton (Sfriso et al, 1992;Valiela et al, 1992;McGlathery et al, 2001). The lower phytoplankton production has been attributed to nutrient competition between macroalgae and phytoplankton (Fong et al, 1993;ThyboChristensen & Blackburn, 1993;McGlathery et al, 1997) and to water residence times shorter than phytoplankton doubling time (Valiela et al, 1997).…”

Section: Discussioncontrasting

confidence: 57%

Biogeochemical modelling of Ria Formosa (South Portugal)

et al. 2008

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Obtained results suggest that the river network may have a significant effect on lagoon concentrations, in spite of the relatively low river flows, due to the high ammonium and nitrate loads. Scenarios reflecting increases in lagoon bathymetry through dredging operations suggest an increase in lagoon water washout time with potential impacts on water quality and impacts at a scale of tens of km. The obtained results are being used by the Ria Formosa Natural Park authority for management purposes and may be useful to feedback future updates of the watershed management plans, within the scope of the European Union WaterFramework Directive. The use of a lagoon scale models is therefore justified in this work.2

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Section: Discussioncontrasting

confidence: 57%

Biogeochemical modelling of Ria Formosa (South Portugal)

et al. 2008

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“…In shallow-water sediments that are illuminated, nutrient turnover is complicated by the presence of benthic primary producers. Although denitrification is, along with anaerobic ammonium oxidation (Thamdrup and Dalsgaard 2002), the only known process that removes N permanently from the ecosystem, a potentially important internal sink of N in shallow land-margin areas is temporal retention by benthic primary producers (e.g., Dudley et al 2001;McGlathery et al 2001).…”

mentioning

confidence: 99%

Benthic nitrogen fluxes along a depth gradient in a microtidal fjord: The role of denitrification and microphytobenthos

Sundbäck

Linares

Larson

et al. 2004

Limnology & Oceanography

131

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In littoral sediments, microphytobenthic (MPB) nitrogen assimilation often exceeds nitrogen removal by denitrification, partly because MPB activity suppresses denitrification. Little is known about the balance between these two processes at sublittoral depths. Benthic pigment composition, light and dark oxygen, and nutrient fluxes (NO 3 Ϫ , NH 4 ϩ , dissolved organic nitrogen (DON), PO , Si(OH) 4 ), as well as denitrification were measured between 1 and 3Ϫ 4 15 m in depth in Gullmar Fjord (Skagerrak) in spring and autumn. The hypothesis was that the assimilation/ denitrification ratio would decrease with depth, along with decreasing MPB activity caused by light limitation. MPB photosynthesis occurred along the entire depth gradient, although sediments were net autotrophic only above 5 m. Inorganic nitrogen (DIN) (and silica) flux changed along the depth gradient, the general pattern being sediment uptake at Յ5 m and efflux at Ն10 m depth. DON flux (ϳ50% of total dissolved nitrogen flux) showed a less clear pattern. Two trends regarding DIN fluxes and denitrification-significant light effects and negative correlations with gross primary productivity-showed that MPB activity influenced nitrogen (N) turnover. Although denitrification increased with depth, rates remained low (Ͻ0.4 mmol N m Ϫ2 d Ϫ1 ), and MPB assimilation (0.2-3.6 mmol N m Ϫ2 d Ϫ1 ) exceeded or equaled denitrification. MPB incorporated ϳ35% of the remineralized N along the depth gradient, whereas denitrification removed ϳ20%. Thus, the influence of MPB on benthic nitrogen turnover, denitrification included, extends to sublittoral depths. Further, denitrification does not necessarily remove more N in the deeper, heterotrophic part of the photic zone, compared to the littoral, autotrophic zone.

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“…Humans have heavily impacted coastal zones, and many estuaries show signs of eutrophication (Bricker et al 2007;Cloern 2001;de Jonge et al 2002;Nixon 1995) with low water quality, seasonal harmful algal blooms (Paerl 1988), hypoxia (Diaz 2001;Diaz and Rosenberg 1995;Kemp et al 2009;Rabalais et al 1996;Turner and Rabalais 1994;Vaquer-Sunyer and Duarte 2008), and fish kills (Thronson and Quigg 2008). Microphytobenthos (MPB), i.e., unicellular benthic photosynthesizers such as diatoms and cyanobacteria, are important mediators of nutrient and carbon fluxes in these shallow environments (Eyre andFerguson 2002, 2005;McGlathery et al 2001;McGlathery et al 2004;Risgaard-Petersen 2003;Rysgaard et al 1995;Sundbäck et al 1991). These producers may account for greater than 50% of gross primary productivity, i.e., the total photosynthetic flux, in estuaries (Underwood and Kromkamp 1999).…”

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confidence: 99%

Quantifying photosynthetic rates of microphytobenthos using the triple isotope composition of dissolved oxygen

Stanley

Howard

2013

Limnology & Ocean Methods

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Microphytobenthos are important mediators of nutrient and carbon fluxes in coastal environments. However, quantifying production rates by microphytobenthos is difficult, and existing methods necessitate perhaps erroneous assumptions that dark respiration equals light respiration. Here we present a new method for quantifying photosynthetic rates of microphytobenthos, i.e., gross primary production, by using the triple isotope composition of dissolved oxygen in benthic flux chambers. Because the triple oxygen isotope signature is sensitive to photosynthesis, but not to respiration, this method allows quantification of gross photosynthetic oxygen fluxes by microphytobenthos without assumptions about respiration. We present results from field experiments in Waquoit Bay, Massachusetts, that illustrate the method.

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Magnitude and variability of benthic and pelagic metabolism in a temperate coastal lagoon

Cited by 133 publications

References 55 publications

Biogeochemical modelling of Ria Formosa (South Portugal)

Biogeochemical modelling of Ria Formosa (South Portugal)

Benthic nitrogen fluxes along a depth gradient in a microtidal fjord: The role of denitrification and microphytobenthos

Quantifying photosynthetic rates of microphytobenthos using the triple isotope composition of dissolved oxygen

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