The influence of long emersion on biota, ammonium fluxes and nitrification in intertidal sediments of Marennes-Oléron Bay, France

Autor: Dominique Gouleau, Pierre-Guy Sauriau, Michelle Girard, Lucette Joassard, D. Brossard, Mario J.C. Laima, Pierre Richard
Přispěvatelé: Centre de Recherche sur les Ecosystèmes Marins et Aquacoles (CREMA), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Centre National de la Recherche Scientifique (CNRS), LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), IFREMERCNRSFrench Ministry of Foreign AffairsPortuguese Foundation for Science and Technology
Jazyk: angličtina
Rok vydání: 2002
Předmět:
0106 biological sciences
Geologic Sediments
010504 meteorology & atmospheric sciences
Nitrogen
[SDE.MCG]Environmental Sciences/Global Changes
Intertidal zone
Aquatic Science
Sodium Chloride
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
Oceanography
Emersion
01 natural sciences
Nutrient flux
Sediment–water interface
Water Movements
Animals
14. Life underwater
Biomass
Nitrogen cycle
Mudflats
0105 earth and related environmental sciences
Analysis of Variance
010604 marine biology & hydrobiology
Sediment
Eukaryota
Biota
General Medicine
Hydrogen-Ion Concentration
Pollution
Invertebrates
Nitrification
6. Clean water
Salinity
Oxygen
Quaternary Ammonium Compounds
[SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology
13. Climate action
Benthic zone
Environmental science
France
Seasons
Ammonium
Zdroj: Marine Environmental Research
Marine Environmental Research, Elsevier science, 2002, 53 (4), pp.381-402. ⟨10.1016/S0141-1136(01)00126-X⟩
ISSN: 0141-1136
1879-0291
Popis: International audience; A comparative study between waterlogged and reflooded intertidal sediments was undertaken in March and June 1999 through statistical analysis of selected sediment parameters (biota, salinity, O2, Eh), pool sizes and benthic fluxes of nutrients (NH4+, NO2−, NO3−) and nitrification rates. In March samples, absence of polychaetes and oligochaetes from upper sediment horizons were due to erosional events sweeping away surface sediments. Presence of richer annelid assemblages in June samples indicated more stable hydrodynamic conditions that favoured the development of benthic microalgae biofilms. Dewatering of sediments during a 3-day emersion period promoted a salinity rise on top layers, migration of pore water ions towards the sediment surface, and created sediment fissures that accelerated water exchange on reflooding. Reflooded and waterlogged sediment systems were comparable with respect to the release of NH4+ to overlying water but were different with respect to nitrification rates. Sediment-water NH4+ fluxes were higher (P=0.011) in March (3.3 mmol m−2 day−1) compared to June (1.4 mmol m−2 day−1) due to higher macrofauna biomasses and lower benthic microalgae concentrations in March samples. Potential nitrification rates (range from 19 to 60 mmol NO3− m−2 day−1) were not statistically different between March and June. A thinner oxic layer in reflooded compared with waterlogged systems reflects a decrease of O2 diffusion into sediment at high salinities which resulted in the fall of the actual nitrification rates (P
Databáze: OpenAIRE
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