The impact of biotic and abiotic factors on the distribution of surface sediment dinoflagellate cyst assemblages on the Nanji Island in the East China Sea-中国期刊网

摘要 ThedinoflagellatecystassemblagesontheNanjiIslandintheEastChinaSea,aredocumentedatthefirsttimetoconstructaquantitativeoverviewofthecystbankfrom2014to2015.Thirty-fourmorphotypesfromsixgroupsareidentifiedandquantifiedateightsamplingsitesaroundtheisland,includingahighproportionofpotentiallytoxigenicspecies(14%).Autotrophicdinocystsconstitute74%ofthetotalcystcounts,whichisrelativelylow(twotothirty-threepermillilitresediment)comparedwithpreviousstudiesinadjacentareas.ScrippsiellatrochoideaandProtoperidiniumavellanaarethemostabundantautotrophicandheterotrophicspecies,respectively.Amultivariateanalysisisperformedtoassessassociationsbetweendinocystsandabioticorbioticvariables.Differentiationamongseasonsisevidentinthedetrendedcorrespondenceanalysis(DCA)ordinationplot,whileaspatialpatternisnotclearlyrevealeddespiteheterogeneityofthehydrodynamicconditionsbetweensamplingsites.Solublereactivephosphate,theratioofnitrogentophosphorusconcentrationsandKareniamikimotoibloomarethethreefactorssignificantly(P<0.05)relatedtosurfacesedimentcystassemblagedefinedbythecanonicalcorrespondenceanalysis(CCA),highlightingtheimportanceofnutrientregimetoadinocystdistributioninthisarea.AlthoughattemptstoaddresstheoriginofHABeventsinrecentyearsusingseedbankshavefailed,knowledgecanbevaluableforfurtherinvestigationofdinocystdynamicsandpotentialtoxinthreatsontheNanjiIsland.

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The impact of biotic and abiotic factors on the distribution of surface sediment dinoflagellate cyst assemblages on the Nanji Island in the East China Sea

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The impact of biotic and abiotic factors on the distribution of surface sediment dinoflagellate cyst assemblages on the Nanji Island in the East China Sea

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