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XEasternoyster(Crassostreavirginica)filtration,biodeposition,andsedimentnitrogencyclingattwooysterreefswithcontrastingwaterqualityinGreatBayEstuary(NewHampshire,USA)TimothyJ.Hoellein•ChesterB.Zarnoch•RaymondE.GrizzleReceived:29January2014/Accepted:4September2014/Publishedonline:17September2014�SpringerInternationalPublishingSwitzerland2014AbstractBenthicdepositionofcarbon(C)andnitrogen(N)-richoysterbiodepositsmayincreasedenitrification,oranaerobicrespirationofnitrate(NO3-)todi-nitrogengas(N2).However,environ-mentaldriversofCandNdynamicsinoysterbiodepositsandreef-adjacentsedimentsrequireclarification.InJuly2012,wecollectedintactsedimentcoresadjacenttoand15–20mawayfromtwooysterreefs(Crassostreavirginica)inGreatBay,NewHampshire,USA:onereferencesiteandonesitewithculturaleutrophication.Wealsomea-suredseston,chlorophylla,andinsituoysterfeedingandbiodeposition.Coreswereincubatedincontin-uous-flowchamberswhereinflowwaterreceived15N-ammonium(NH4?),15NO3-,ornoisotopes(control).Wequantifiedfluxes