{"refrec":{"BRefID":56576,"RR":"<b>Bartoli, M.; Nizzoli, D.; Viaroli, P.</b> (2003). Microphytobenthos activity and fluxes at the sediment-water interface: interactions and spatial variability. <i>Aquat. Ecol. 37(4)</i>: 341-349","BEntID":54180,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Aquat. Ecol. 37(4)</i>: 341-349","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Bartoli, M.; Nizzoli, D.; Viaroli, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Bartoli, M.; Nizzoli, D.; Viaroli, P.","Englishabstract":"In this study oxygen and nutrient fluxes and denitrification rates across the sediment-water interface were measured via intact core incubations with a twofold aim: show whether microphytobenthos activity affects these processes and analyse the dispersion of replicate measurements. Eighteen intact sediment cores (i.d. 8 cm) were randomly sampled from a shallow microtidal brackish pond at Tjarno, on the west coast of Sweden, and were incubated in light and in darkness simulating in situ conditions. During incubation O<sub>2</sub>, inorganic N and SiO<sub>2</sub> fluxes and denitrification rates (isotope pairing) were measured. Assuming mean values of 18 cores as best estimate of true average (BEA), the accuracy of O<sub>2</sub>, NH<sub>4</sub><sup>+</sup>, NO<sub>3</sub><sup>-</sup> and SiO<sub>2</sub> fluxes calculated for an increasing number of subsamples was tested. At the investigated site, microalgae strongly influenced benthic O<sub>2</sub>, inorganic N and SiO<sub>2</sub> fluxes and coupled (D<sub>n</sub>) and uncoupled (D<sub>w</sub>) denitrification through their photosynthetic activity. In the shift between dark and light conditions NH<sub>4</sub><sup>+</sup> and SiO<sub>2</sub> effluxes (60 and 110 µmol m<sup>-2</sup> h<sup>-1</sup>) and D<sub>n</sub> (5 µmol m<sup>-2</sup> h<sup>-1</sup>) dropped to zero, NO<sub>3</sub><sup>- </sup> uptake (70 µmol m<sup>-2</sup> h<sup>-1</sup>) showed a 30% increase, while D<sub>w</sub> (20 µmol m<sup>-2</sup> h<sup>-1</sup>) showed an 80% decrease. For O<sub>2</sub> and NO<sub>3</sub><sup>-</sup> dark fluxes, 4 core replicates were sufficient to obtain averages within 5-10% of the best estimated mean, while 10-20% accuracy was obtained with 4-12 replicates for SiO<sub>2</sub> and >10 replicates for NH<sub>4</sub><sup>+</sup> dark fluxes. Mean accuracy was considerably lower for all light incubations, probably due to the patchy distribution of the benthic microalgal community.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Microphytobenthos activity and fluxes at the sediment-water interface: interactions and spatial variability","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2004-01-23","DateCreate":"2004-01-20","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000187003000002","VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":56576,"PubliDate":2003,"Pagination":"341-349","XtraPublOfAnaID":null,"ISBN":null,"Volume":"37","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42197,"SerRR":"Aquatic Ecology. 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