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26420064ACTAECOLOGICASINICAVol.26,No.4Apr.,2006王朝晖,齐雨藻,陈菊芳,徐宁(,510632):(40306020);(2001CB409701):20040713;:20051212:(1968~),,,,.*Correspondingauthor.Email:twzh@jnu.edu.cnFoundationitem:TheprojectwassupportedbytheNationalNaturalScienceFoundationofChina(No.40306020);NationalKeyBasicResearchProgram(No.2001CB409701)Receiveddate:20040713;Accepteddate:20051212Biography:WANGZhaoHui,Professor,mainlyengagedinaquaticecology.:19976~1998719992000(Chaetocerosspp.),,(C.affinis)(C.debilis)(C.distans)(C.lorenzianus)1997~1998,6680.6cellsml99.78%,,DIN,,DIN:;;;:10000933(2006)04109607:X145,Q178.53:APopulationdynamicsofChaetocerosspp.andmultivariateanalysisofitsrelationshipwithenvironmentalfactorsinDayaBay,SouthChinaSeaWANGZhaoHui,QIYuZao,CHENJuFang,XUNing(InstituteofHydrobiology,JinanUniversity,Guangzhou510632,China).ActaEcologicaSinica,2006,26(4):1096~1102.Abstract:PopulationchangesinChaetoceorsspp.andenvironmentalfactorswereinvestigatedinDayaBay,SouthChinaSea,fromJune1997toJuly1998andthespringof1999and2000.RelationshipsbetweenabundanceofChaeto.spp.andsomeenvironmentparameterswereanalyzedbymultivariategenerallinearfactorialanalysis,linearstepwiseregressionanalysis,andprinciplecomponentanalysis.ChaetoceroswasthemostabundantgenusofphytoplanktoninDayaBay,contributing23.25%ofthetotalphytoplanktonabundance.Chaetocerosreachedpeakabundanceinthespringof1998,withmaximumcelldensityof6680.6cellsmland99.78%oftotalphytoplankton.C.affinis,C.debilis,C.distansandC.lorenzianuswerethemainbloomcausativespecies.ThenutrientlevelswerehighjustbeforethebloomofChaetoceros,butdroppedrapidlyasthebloomdeveloped.Resultsshowedthatdepletionofnutrientsespeciallydissolvedinorganicnitrogen(DIN)ledtothecollapseofChaetocerosbloom.PeakabundancesofCheatocerosoccurredunderawidevarietyofwatertemperature(15to31)andsalinity(15psuto31psu).ResultsfromstatisticalanalysesrevealedthatwatertemperatureandratiosbetweennutrientswerethekeyfactorsinfluencingonpopulationdynamicsofChaetoceros,whileDINandsalinityplayedimportantrolesaswell.Keywords:Chaetoceros;DayaBay;environmentalfactors;algalbloom,,,,[1](Chaetocerosspp.),,[2,3],,,,1997~2000,,,11.18(1),St.1,St.2St.7St.8,St.3~St.5,St.615L0.5m,1L,,![4],4%,24h,20~50ml,0.1mlOlympusCH30BH21Fig.1SamplingstationsinAotouareaofDayaBay1Table1Date,frequencyofsamplingandanalyzedparametersinthissurveySamplingtimeSamplingstations,analyzedparameters,andfrequency199707~199804St.2:3d,,,;:m19980402~0601St.1~St.6:3d,St.7,St.8:15d,19990318~060120000407~0523St.1,St.2:d;St.3St.6:3d,1.2SPSS10.0,(DIN)(DIP)(DSi)(N∀P)(Si∀N)(Si∀P),;a(Chla)Fe,22.1,(Chaetocerosaffinis)(C.borealis)(C.brevis)(C.compressus)(C.debilis)(C.constrictus)(C.curvisetus)(C.densus)(C.didymus)(C.distans)(C.diversus)(C.indicum)(C.laciniosus)(C.lorenzianus)(C.peruvianus)(C.subsecundus)(C.subtilis)(C.vanheurckii)(C.weissflogii),,,22.210974:21997~1998199920001997~1998,(2a),19985,6680.6cellsmL99.78%1997~1998,23.25%4,,(Thalassiosirasubtilis),3,,,640~907cellsml,40%~50%,19992000,,,866.2cellsml588.8cellsml(2b,2c)2Fig.2ChangesincelldensityofChaetocerosspp.andoverallphytoplankton3Fig.3AbundanceofChaetocerosspp.plottedagainstwatertemperatureandsalinity,25~3025~31psu(3),1998,,16,,30,,,15~31psu199778,,25psu,81515psu,(Skenetonellacostatum),,,1997~199819992000,,DIN,1098262.31997~1998419985,1000cellsml,,2870.0cellsml,,19982()632.4cellsml,100cellsml(4a),,5,(19978)504.0cellsml300.8cellsml(4b,4c),31,,,(4d)4Fig.4SeasonalchangesincelldensityofdominantChaetocerosspecies,,DIN,DIN204gL43gL;DSi,;DIP,,DIN,[7]2.42.4.11998~20002,N∀P,3a0.05;,2000,19981999,1998Si∀NN∀P,;1999,DSiSi∀PN∀P;2000DINN∀P21998~2000Table2SignificantofmultivariategenerallinearfactorialanalysisbetweencelldensityofChaetocerosspp.andenvironmentalfactorsinthreespringsfrom1998to2000YearTemperatureSalinityDINDIPDSiN∀PSi∀NSi∀P19980.035*0.1470.920.9290.1290.0580.01*0.89519990.01*0.01*0.3320.3620.0520.036*0.2310.02*20000.7640.8160.01*0.7950.9940.01*0.9990.999*0.05Sig.,p0.0510994:2.4.2,3,,DIN,DIPDSi,,[8],[7]3Table3LinearstepwiseregressionanalysisbetweencelldensityofChaetocerosspp.andenvironmentalfactorsYearF1998LinearregressionDchaeto=-5675.0+156XT+64.1XS-0.19XDIN-3.85XDIP-0.08XDSi-2.26XN∀P-4.51XSi∀N+0.88XSi∀Pdf=212,R=0.341**3.356LinearstepwiseregressionDchaeto=-317.53+135.4XT-1.78XDINdf=212,R=0.286**9.3361999LinearregressionDchaeto=1597.9+11.9XT-55.9XS+0.26XDIN-0.76XDIP-0.02XDSi-0.14XN∀P-0.90XSi∀N-0.05XSi∀Pdf=250,R=0.552**11.314LinearstepwiseregressionDchaeto=1409.7+12.5XT-51.3XSdf=250,R=0.512**43.9432000LinearregressionDchaeto=263.7-9.69XT+0.48XS+0.46XDIN-4.51XDIP-0.06XDSi+0.40XN∀P+10.0XSi∀N-0.05XSi∀Pdf=161,R=0.636**13.014LinearstepwiseregressionDchaeto=293.0-9.65XT+0.65XDIN-6.30XDIP-0.079XDSi+9.1XSi∀Ndf=161,R=0.624**19.940*DchaetoXTXSXDINXDIPXDSiXN∀PXSi∀NXSi∀P(cellsml)()DINDIPDSi(gL),**0.001,p0.0012.4.31998~2000aDINDIPDSiN∀PSi∀NSi∀PFe142,240%3a,(5),af1,3,a,f1NPSif2,NPSif2,f1,f251998~2000Fig.5ComponentplotinrotatedspaceofprincipalanalysisonenvironmentalandbiologicalfactorsinDayaBayinspringsfrom1998to20002.4.4,,110026,DIN20~30,,,3a,,,DIPN∀P[9,10],DSi