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1、Vol.354:85–95,2008MARINEECOLOGYPROGRESSSERIESPublishedFebruary7doi:10.3354/meps07215MarEcolProgSerQuantitativesignificanceofn-3essentialfattyacidcontributionbyheterotrophicprotistsinmarinepelagicfoodwebsFu-LinE.Chu*,EricD.Lund,JenniferA.PodbesekVirginiaInstituteofMarineScience,CollegeofWil
2、liamandMary,POBox1346,GloucesterPoint,Virginia23062,USAABSTRACT:Toassessthecontributionofn-3essentiallipidsbyheterotrophicprotistsinthepelagicfoodwebs,weexaminedthekineticsandefficiencyoflong-chainn-3essentialfattyacid(LCn-3EFA)productionof2commonheterotrophicprotists,OxyrrhismarinaandGyro
3、diniumdominans,fedanalga(Dunaliellatertiolecta)deficientinbotheicosapentaenoicacid(EPA)anddocosahexaenoicacid(DHA).D.tertiolectawasrapidlyingestedandconsumedbytheheterotrophicprotists.Growthratesrangedfrom0.77to0.82and0.78to0.92d–1inO.marinaandG.dominans,respectively.LCn-3EFAproductioninth
4、e2heterotrophicprotistsreachedthehighestlevelsatthehighestprotistcelldensityinthefeedingexperiments,equivalenttoaproductionof1.9±0.3µgEPAand22.3±6.4µgDHAbyO.marinaand4.7±0.5µgEPAand16.5±1.1µgDHAbyG.dominanspermgalgalcarboncon-sumed.BothprotistscontainedmuchhigherlevelsofDHA,anutrientcritic
5、alforneuralandvisualdevelopmentformarineorganismsathighertrophiclevels,comparedtothegoodfoodqualityalgaRhodomonassalina.ThissuggeststhattheLCn-3EFAcontributionbyheterotrophicprotiststothepelagicfoodwebsisquantitativelysignificantandmaybecrucialfortheproductionandrecruitmentofspeciesathighe
6、rtrophiclevels,particularlyattimesofbloomsdominatedbyalgalspeciesdefi-cientinLCn-3EFAsorwhentheprimaryproducerstandingstockisdominatedbypico-andnanoplanktonduringnon-bloomperiods.KEYWORDS:Heterotrophicprotists·Algae·Essentialfattyacids·Nutrientupgrading·Docosahexaenoicacid·Eicosapentaenoic
7、acid·Phytoplankton-heterotrophicprotistinterfaceResaleorrepublicationnotpermittedwithoutwrittenconsentofthepublisherINTRODUCTIONlationoftheinsitualgalandbacterialbiomass,thusaffectingcommunitycompositionandproduction.Microzooplankton,mainlyciliatesandheterotro
