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

Bentbic oxygen and nutrient ftuxes were measured in a section of the hypersaline carbonate-rich coastal lagoon of Araruama, SE-Brazil. In situ incubations of the sediment surface (Zm - 1.5) were performed at one station with light/dark chambers during september 1993 (early spring period) and april 1995 (earlyautumn period). The carbonate..rich aediments were covered by 1-3 mm thick microalgal mats, dominated by the cyanobaeteria Phormidium sp, Oscillatoria sp, and Lyngbya sp. Benthic net primary production rates were 15.4 ± 0.7 mmolC/m²/d in early spring and 33.8 ± 8.8 mmolC/m²/d in early autumn, total community respiration rates attained 35.3 ± 7.2 and 65.7 ± 16.9 mmolC/m²/d, and pelagic primary production rates 1.7 ± 0.7 and 4.0 ± 1.4 mmolC/m²/d, respectively. Total community metabolism was thus heterauophic and mainly driven by benthic metabolism. The benthic release rates af ammonia were 0.65 ± 0.32 mmolC/m²/day in early spring and 0.58± 0.42mmoVm ldaym early autumn, butwere near to negligible for orthophosphate. Pelagic primaryproduction was limited byphosphorous, in part, by the preferential release of étmmonia over orthophosphate from the sediment-water interface. The benthic primary production and nutrient release rates were within the range of other eury-to hypersaline carbonate-rich environments characterized by non- consolidated algat rats.

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Benthic primary production, respiration and remineralisation: in situ measurements in the soft-bottom Abra alba community of the western English Channel (North Brittany)

Journal of Sea Research ◽

10.1016/j.seares.2004.12.002 ◽

2005 ◽

Vol 53 (4) ◽

pp. 223-229 ◽

Cited By ~ 4

Author(s):

Aline Migné ◽

Dominique Davoult ◽

Jean-Jacques Bourrand ◽

Guy Boucher

Keyword(s):

Primary Production ◽

In Situ Measurements ◽

English Channel ◽

Soft Bottom ◽

Benthic Primary Production

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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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In situ measurements of benthic primary production during emersion: seasonal variations and annual production in the Bay of Somme (eastern English Channel, France)

Continental Shelf Research ◽

10.1016/j.csr.2004.06.002 ◽

2004 ◽

Vol 24 (13-14) ◽

pp. 1437-1449 ◽

Cited By ~ 66

Author(s):

A. Migné ◽

N. Spilmont ◽

D. Davoult

Keyword(s):

Primary Production ◽

Seasonal Variations ◽

In Situ Measurements ◽

Annual Production ◽

English Channel ◽

Benthic Primary Production

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The Simulated in situ Measurements of Oceanic Primary Production

Marine and Freshwater Research ◽

10.1071/mf9630139 ◽

1963 ◽

Vol 14 (2) ◽

pp. 139 ◽

Cited By ~ 23

Author(s):

HR Jitts

Keyword(s):

Primary Production ◽

In Situ Measurements ◽

Light Conditions ◽

Significant Relation ◽

Blue Glass ◽

Simultaneous Measurements ◽

Reflected Light

Simultaneous measurements with two types of incubators were made on replicate samples both in the incubators and in situ in the ocean. Both incubators used sunlight and blue glass filters to simulate light conditions at depths in the ocean. The first gave measurements of column production 1.58 times those in situ. This was due to the fact that at depths greater than 20 m the incubator gave much higher results with no significant relation to those measured in situ. In the second incubator the accuracy of reproduction of oceanic light conditions was improved by reducing reflected light and using a balance-by-depth twin photometer system for determining the depths of sampling. The measurements of column production in the second incubator were 1.03 times the in situ values.

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