Benthic primary production and mineralization in a High Arctic fjord: in situ assessments by aquatic eddy covariance

A comparison of estimates of benthic primary production on a sandy beach measured by in situ oxygen and laboratory C14 methods showed that both methods gave similar measures of the magnitude of production. Sources of error in each method are discussed. Measures of C14 uptake offer sensitivity when production is low, but when undisturbed sediment cores can be obtained, production is most easily measured by following changes in dissolved oxygen.

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PRIMARY PRODUCTION OF CRUSTOSE CORALLINE RED ALGAE IN A HIGH ARCTIC FJORD 1

Journal of Phycology ◽

10.1046/j.1529-8817.2002.01104.x ◽

2002 ◽

Vol 38 (2) ◽

pp. 273-283 ◽

Cited By ~ 46

Author(s):

Rodney D. Roberts ◽

Michael Kühl ◽

Ronnie Nøhr Glud ◽

Søren Rysgaard

Keyword(s):

Primary Production ◽

Red Algae ◽

High Arctic ◽

Coralline Red Algae ◽

Arctic Fjord

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In situ measurements of benthic primary production, respiration and nutrient fluxes in a hypersaline coastal lagoon of SE Brazil

Brazilian Journal of Oceanography ◽

10.1590/s1679-87591996000200005 ◽

1996 ◽

Vol 44 (2) ◽

Cited By ~ 2

Author(s):

Bastiaan Knoppers ◽

Weber Friederichs Landim de Souza ◽

Marcelo Friederichs Landim de Souza ◽

Eliane Gonzalez Rodriguez ◽

Elisa de Fátima da Cunha Vianna Landim ◽

...

Keyword(s):

Primary Production ◽

Coastal Lagoon ◽

In Situ Measurements ◽

Nutrient Fluxes ◽

Benthic Primary Production ◽

Se Brazil ◽

Hypersaline Coastal Lagoon

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Observation of a living macroalga at 166 m in a high Arctic fjord

Marine Biodiversity Records ◽

10.1017/s175526721500038x ◽

2015 ◽

Vol 8 ◽

Cited By ~ 1

Author(s):

Kirstin S. Meyer ◽

Andrew K. Sweetman

Keyword(s):

Present Report ◽

High Arctic ◽

Bottom Current ◽

Light Conditions ◽

Low Light ◽

Arctic Fjord ◽

Glacial Sedimentation

Still photos of the seafloor in Raudfjorden, Spitsbergen, recorded in 2011, showed an abundant macroalga at a depth of 166 m. The macroalga was observed attached to stones of varying size and streaming in the bottom current, which would imply that the alga was alive and growingin situ. The alga likely experiences very low-light conditions, as it is present in a turbid fjord influenced by glacial sedimentation. Arctic macroalgae are often adapted to low-light conditions, but to the authors’ knowledge, the present report is the deepest record of living macroalgae in the high Arctic.

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Benthic primary production during emersion: In situ measurements and potential primary production in the Seine Estuary (English Channel, France)

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2005.09.016 ◽

2006 ◽

Vol 53 (1-4) ◽

pp. 49-55 ◽

Cited By ~ 34

Author(s):

N. Spilmont ◽

D. Davoult ◽

A. Migné

Keyword(s):

Primary Production ◽

In Situ Measurements ◽

Seine Estuary ◽

English Channel ◽

Benthic Primary Production

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Technical note: Estimating light-use efficiency of benthic habitats using underwater O<sub>2</sub> eddy covariance

Biogeosciences ◽

10.5194/bg-17-4343-2020 ◽

2020 ◽

Vol 17 (16) ◽

pp. 4343-4353

Author(s):

Karl M. Attard ◽

Ronnie N. Glud

Keyword(s):

Primary Production ◽

Eddy Covariance ◽

Technological Development ◽

Gross Primary Production ◽

Technical Note ◽

Light Use Efficiency ◽

In Situ Conditions ◽

Use Efficiency ◽

Habitat Scale

Abstract. Light-use efficiency defines the ability of primary producers to convert sunlight energy to primary production and is computed as the ratio between the gross primary production and the intercepted photosynthetic active radiation. While this measure has been applied broadly within terrestrial ecology to investigate habitat resource-use efficiency, it remains underused within the aquatic realm. This report provides a conceptual framework to compute hourly and daily light-use efficiency using underwater O2 eddy covariance, a recent technological development that produces habitat-scale rates of primary production under unaltered in situ conditions. The analysis, tested on two benthic flux datasets, documents that hourly light-use efficiency may approach the theoretical limit of 0.125 O2 per photon under low-light conditions, but it decreases rapidly towards the middle of the day and is typically 10-fold lower on a 24 h basis. Overall, light-use efficiency provides a useful measure of habitat functioning and facilitates site comparison in time and space.

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