Spatial and seasonal variability of sediment oxygen consumption and nutrient fluxes at the sediment water interface in a sub-tropical lagoon (New Caledonia)

Marine Pollution Bulletin
C GrenzR Fichez

Abstract

In order to quantify the spatial and seasonal variations of sediment oxygen consumption and nutrient fluxes, we performed a spatial survey in the south west lagoon of New Caledonia during the two major seasons (dry and wet) based on a network of 11 sampling stations. Stations were selected along two barrier reef to land transects representing most types of sediments encountered in the lagoon. Fluxes were measured using ex-situ sediment incubations and compared to sediment characteristics. Sediment oxygen consumption (SOC) varied between 500 and 2000 micromol m(-2)h(-1), depending on season and stations. Nutrient effluxes from sediment were highly variable with highest fluxes measured in muddy sediments near the coast. Inter-sample variability was as high as seasonal differences so that no seasonally driven temperature effect could be observed on benthic nutrient fluxes in our temperature range. Nutrient fluxes, generally directed from the sediment to the water column, varied between -5.0 and 70.0 micromol m(-2)h(-1) for ammonia and between -2.5 and+12.5 micromol m(-2)h(-1) for PO(4) and NO(2+3). SOC and nutrient fluxes were compared to pelagic primary production rates in order to highlight the tight coupling existing between th...Continue Reading

References

Apr 14, 2000·Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie·S BujanP Douillet
Mar 22, 1991·Science·D E Canfield, D J Des Marais
Dec 1, 1996·Limnology and Oceanography·B Thamdrup, D E Canfield
Jul 14, 2010·Marine Pollution Bulletin·Jean-Pascal TorrétonEnora Briand

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Citations

Apr 6, 2012·Marine Pollution Bulletin·Nabila Gaertner-MazouniLoic Charpy
Feb 5, 2016·Journal of Experimental Botany·John A Raven, Timothy D Colmer
Dec 29, 2019·Environmental Science and Pollution Research International·Xin MengBaoqing Shan
Aug 31, 2019·The Science of the Total Environment·Pauline MerrotGuillaume Morin

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