简介:Anexperimentwasdesignedtoselecteconomicallyvaluablemacroalgaspecieswithhighnutrientuptakerates.Suchspeciesculturedonalargescalecouldbeapotentialsolutiontoeutrophication.Threemacroalgaespecies,Ulvapertusa(Chlorophyta),Gelidiumamansii(Rhodophyta)andSargassumenerve(Phaeophyta),werechosenfortheexperimentbecauseoftheireconomicvaluesandavailability.ControlandfournitrogenconcentrationswereachievedbyaddingNH4andNO3.Theresultsindicatethatthefreshweightsofallspeciesincreasefasterthanthatofcontrolafter5dculture.ThefreshweightofUlvapertusaincreasesfastestamongthe3species.However,differentspeciesshowdifferentresponsestonitrogensourceanditsavailability.TheyalsoshowtheadvantageofusingNH+4thanusingNO-3.U.Pertusagrowsbestandshowshighercapabilityofremovingnitrogenat200μmolL-1,butithaslowereconomicalvalue.G.Amansiihashighereconomicalvaluebutlowercapabilityofremovingnitrogenat200μmolL-1.ThecapabilityofnitrogenassimilationofS.EnerveishigherthanthatofG.Amansiiat200μmolL-1,buttheformer'sincreaseoffreshweightislowerthanthoseofothertwospecies.Thenpresentpreliminarystudydemonstratesthatitispossibletousemacroalgaeasbiofiltersandfurtherdevelopmentofthisapproachcouldprovidebiologicallyvaluableinformationonthesource,fate,andtransportofNinmarineecosystems.Cautionisneededshouldweextrapolatethesefindingstonaturalenvironments.