简介:为Protoperidinium种类的分类和鉴定在它的分类学习期间是最困难的工作。在这研究,Protoperidinium的分类地位被跟踪它的分类历史澄清,23种类在中国的海岸上属于类Protoperidiniumpreliminarily被识别,并且词法描述和板模式为每种被给。类似的种类的关键差别也在这研究被讨论,我们相信那P。oceanicum和P。murry,P。tumidum和P。fatulipes,P。水珠和P。majus是分开的种类;P。diabolum应该被当作有效名字而不是报导名字Peridiniumglobosum或Peridiniumlongipes;在P之间的分类关系。punctulatum和P。subinerme要求进一步的学习。
简介:Dominantspeciesofzooplanktoncommunityvarywithlatitude.ThoughChinapossessesavastcoastalareainnorthwesternPacific,studiesonthelatitudinaldominantspeciesgradientarerare.WecollectedzooplanktonsamplesfromHaizhouBay(34.56?–35.19?N,119.51?–120.30?E),YueqingBay(28.14?–28.38?N,121.10?–121.21?E)andDongshanBay(23.65?–23.90?N,117.45?–117.60?E)inMay2012andMay2013topreliminarilycharacterizethelatitudinaldominantspeciesdistribution.Allthesampleswerecollectedverticallyusinga0.505mmmeshplanktonnetwith0.8minmouthdiameterfrombottomtosurface.Calanussinicus,Aidanosagittacrassa,Labidoceraeuchaeta,Zonosagittanagae,AcartiapacificaandParacalanusparvuswerefoundtobedominant.C.sinicuswasthemostdominantspeciesandtheuniqueoneoccurredinallthreebays.Withlatitudedecreasing,boththeabundanceandproportionofC.sinicusdeclinedsharply.Clusteranalysisshowedthatthe6dominantspeciescouldbedividedinto3groups,basedontheiroccurrencesinthethreebays.OurresultssuggestedthatthedistributionofdominantspeciesalongthecoastofChinahasasignificantlatitudinalgradient.C.sinicuswhichwidelydistributesinthecoastalwaterofthenorthwesternPacificcanwelladapttothetemperatureatdifferentlatitudes.ThehighabundanceinHaizhouBayindicatedthatC.sinicuswasanexemplarywarm-temperatespecies,andmorecommonlyoccursinthenorthofChinaseas.Theecologicalcharacteristicsofdominantspecieschangefromwarm-temperatetypeinhigh-latitudinalbaystowarmwatertypeinlow-latitudinalbays.
简介:ThestrongadaptabilityofBroussonetiapapyrifera(L.)Vent.tolowphosphorus(P)conditionscanbeattributedtothelargeamountofroot-exudedorganicacidsandthehighef?ciencyofPextraction.However,microelementcontentsarein?uencedbylow-Pstress,andtheireffectsonthephotosyntheticcapabilityofB.papyriferaremainunknown.Inthisstudy,weinvestigatedtheeffectsoflow-Ptreatmentonnetphotosyntheticrate(P_N);chlorophylla?uorescence(ChlF)characteristics;andFe,Mn,Cu,andZncontentsofB.papyriferaandMorusalbaL.seedlings.ResultsshowthatB.papyriferaexhibitedbetterphotosyntheticcapabilityundermoderatePde?-ciency(0.125,0.063,and0.031mmol/LPtreatments),whereasthephotosyntheticcapabilityofM.albadecreasedundermoderateandseverePde?ciency(0.016and0mmol/LPtreatments).UndermoderatePde?ciency,thedecreaseinCuandZncontentsinB.papyriferawaslowerthanthatinM.alba.UnderseverePde?ciency,aconsiderabledecreaseofphotosyntheticcapabilityinB.papyriferaandM.albawasassociatedwithlowCuandZncontents.ThePNofthetwoMoraceaespeciesexhibitedabettercorrelationwithCuandZncontentsthanwithFeorMncontent.Pde?ciencycouldnotonlydecreasecyclicphotophorylationandphotosyntheticef?ciency,butcouldalsoaffectthestabilityofthylakoidmembranestructureandelectrontransportef?ciencybyin?uencingthecontentsofCuorZn,therebyaffectingphotosynthesis.
简介:Horizontalandverticaldistributionsofδ18Oandδ13Cwereinvestigatedinshellsoffourplanktonicforaminiferalspecies,Globigerinoidesruber,Globigerinoidessacculifer,PulleniatinaobliquiloculataandNeogloboquedrinadutertrei,fromatotalof62core-topsedimentsamplesfromtheIndonesianthroughflowregion.Resultswerecomparedtomodernhydrologicconditionsinordertoexplorepotentialofproxiesinreconstructingfluvialdischargeandupperoceanwatercolumncharacteristicsinthisregion.Ourresultsshowthat,intheMakassarStrait,bothofdepletedδ18Oandδ13Cofthesefourspecieswerelinkedtofreshwaterinput.IntheBaliSea,however,depletedδ18Oandδ13Cforthesespeciesmaybeduetodifferentreasons.Depletedδ18Owasaresultoffreshwaterinputandaswellinfluencedbyalong-shorecurrentswhiledepletedδ13CwasmorelikelyduetotheJava-Sumatraupwelling.Comparisonofshellδ18OrecordsandhydrographicdataofWorldOceanAtlas2005suggeststhatG.ruberandG.sacculifercalcifywithinthemixed-layer,respectivelyat0–50mand20–75mwaterdepth,andP.obliquiloculataandN.dutertreiwithintheupperthermocline,bothat75–125mwaterdepth.N.dutertreicalcifiesatslightlydeeperwaterdepththanP.obliquiloculatadoes.Ingeneral,δ13CvaluesofbothG.ruberandG.sacculiferarelargerthanthoseofP.obliquiloculataandN.dutertreiatallsites,possiblyrelatedtodepthhabitatsofthesespeciesandverticaldistributionofnutrientsintheIndonesianthroughflowregion.