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1.
INTRODUCTIONBillard ( 1 986)studiedthespermatozoonultrastructuresinteleostsandfounddistinctdifferencesa mongdifferentspecies.Studyonspermatozoonmorphologyandfunctionisachallengebecauseofthesperm’sspecialenvironment (Gageetal.,1 998;WangandZhang,1 999) .Sinceleft ey…  相似文献   

2.
INTRODUCTIONTheBohaiSea,analmost closedshallowsea,liesnorthwesttotheYellowSea.Fig.1ashowsthege ometryoftheshorelineandthewaterdepthdistributionoftheBohaiSea,whichissmallandshallowcom paredwiththeYellowSeaortheEastChinaSea.Themeandepthislessthan 2 0meters.Be…  相似文献   

3.
1 Introduction18Oinmarineenvironmentplaysanimportantroleinoceanographicalstudy .Asastableisotopeofoxygen ,18OtogetherwithhydrogenatomsconstituteswatermoleculeH218OandmoveswithalargeamountofH2 Omoleculesinseawater.Sothatδ18Obecomesanidealtracerforthemovemento…  相似文献   

4.
The steps forward of GIS in China   总被引:2,自引:0,他引:2  
1 HISTORICALSTEPS—ATEMPORALANA LYSISResearchesofGISinChinacandatebacktotheearly 1980s .Atthattime ,aremotesensingapplica tionprojectwascarriedoutinSouthwestChinausingGISmethodintegratedwithremotesensingdatatosolvetheareameasurementautomatically .Afterthefir…  相似文献   

5.
INTRODUCTIONTheJapaneseseabass (LateolabraxjaponicusC&V)distributeswidelyinthecoastalwatersalongtheBohaiSea ,YellowSea ,EastChinaSea,andSouthChinaSea .Asacarnivorousfish ,itoccupiesthehightrophiclevelinthemarineecosystemandhasadaptedtovariousenvironmentalr…  相似文献   

6.
INTRODUCTIONTheroleofalgalextracellularmetaboliteasabioactivesubstancetocontrolsuccessionofmi croalgalpopulationshadlongbeenrecognized (MastandPace,1 93 8;PrattandFong,1 940 ) .Somemicroalgae,likeChlorellavulgaris,Chlamydomonasreinhardtii,Skeletonemacostatum ,exc…  相似文献   

7.
INTRODUCTIONKnowledgeofgametogenesisinvaluablemarineanimalsisveryimportanttocommercialfish ery.Gametogenesisinbivalveswasextensivelystudiedatdifferentlevels (Dohmen ,1 983 ;DorangeandLePennec ,1 989a,b) .Scallopsandothermarinebivalveshavesimilarreproductivecycle…  相似文献   

8.
INTRODUCTIONTaoandChen (1 987)werethefirsttopointoutthattheAsiansummermonsooniscomprisedoftwosystems:EastAsiansummermonsoon (EASM )andSouthAsiansummermonsoon (SASM) .Theyaredistinctlydifferentfromeachotherinbothlarge scalestructureandconstituentsubsystems.Ther…  相似文献   

9.
INTRODUCTIONTheSouthChinaSea (SCS)isasemi enclosedoceanbasinlocatedataspecialgeographicpo sition ,oneoftheworld’spronouncedmonsoonregions,withnortheastwindsprevailinginwinterandsouthwestwindsinsummer,andisacrucialregionofintensiveair seainteractionofgreat…  相似文献   

10.
INTRODUCTIONTherearealotofpublishedpapersdescribingtheannualorseasonalendocrinechangesassoci atedwithreproductiveactivityinteleostfishes (Scottetal.,1 980 ;Louetal.,1 984 ,1 986;Suzukietal.,1 997;Hou 1 998;Yaronetal.,1 986) ,andevidencethatthegonadalmaturationofsalmo nidfishw…  相似文献   

11.
INTRODUCTIONTheseasurfacemicrolayer (SM)withspecialphysical,chemicalandbiologicalproperties,hadbeenwelldescribedasasiteofintensiveaccumulationofdissolvedandparticulateorganicmat terinvolvingphytoplanktonandbacteria (Hardy,1 982 ) .Thisenvironmenthasgreatimpor…  相似文献   

12.
INTRODUCTIONPufferfishesofthegenusTakifugu (Tetraodontiformes,Tetraodontidae)aremainlydistributedalongthecoastalregionsofChina ,JapanandKoreaandarecommerciallyimportanttothesecoun tries .Over 2 0specieshavebeenrecordedintheYellowSeaandtheEastChinaSea (Cheng…  相似文献   

13.
INTRODUCTIONAccumulatedevidencessuggestedaclosecorrelationbetweenneoplasticdiseaseofaquaticor ganismsandtheincreasingreleaseofgenotoxinsbyanthropogenicactivitiesintoaquaticenvironment(Mix ,1 986;Gardneretal.,1 991 ;GESAMP ,1 991 ) .Ithas,therefore,becomenecessarytoe…  相似文献   

14.
1IntroductionEarthvisionsoftwareintroducedfromU .S .DGIcompanycanplayanimportantpartinbothspatialgeo logicmodelingandcompilingdifferentmaps .Ontheba sisofrealizingsandbodymodelinganddatainterfacebe tweenDaqingblack -oilandEarthvision ,theFaciestractmodelhas…  相似文献   

15.
CHINESEJOURNALOFPOLARSCIENCEisacomprehensiveacademicjournalsponsoredbytheChinesePolarAd ministrationandPolarResearchInstituteofChina.TheprimarypurposeistoreportcurrentimportantdevelopmentinpolarresearchofmanyscientificfieldsforscientificworkersinbothC…  相似文献   

16.
INTRODUCTIONJiaozhouBayisashallowsemi closedbaywithtotalareaofabout 40 0km2 andaveragewaterdepthof7m .Themaximumwaterdepthisover 5 0matthecenterofthestraitconnectingtotheYellowSea.Thisstraitcenterwateriscalledbaymouthwater,thewaterinthenorthernpartofthestrai…  相似文献   

17.
INTRODUCTIONTheWesternPacificWarmPool (WP)isaseaareawhereseasurfacetemperature (SST)isthehighestintheglobaloceansandair seainteractionisthemostviolentinthePacific.Manyre centresearchesshowedthatvariationsinthethermalconditions (inSST ,especially)oftheWPplay…  相似文献   

18.
INTRODUCTIONScuticociliateshavelongbeenknowntobefoundingreatabundanceinallkindsofhabitats,andhavegreatdiversityinspeciesnumber,structure ,behaviorandotherbiologicalcharacters.Asacommonly foundtaxonfromcoastalwaterandculturebiotopes,Pseudocohnilembusharg…  相似文献   

19.
Dimethylsulfide in the South China Sea   总被引:1,自引:0,他引:1  
INTRODUCTIONGreateffortsweredevotedrecentlytostudyingdimethylsulfide(DMS)distributioninseawater,asitaccountsforthemajorpartofthesulfurfluxfromtheoceanstotheatmosphere.Moreover,itsoxidationproductsintheatmospheremayinfluenceenvironmentalacidificationand…  相似文献   

20.
INTRODUCTIONH2,asanonpollutingfuel,seemstobeapreferablealternativeenergysourceofthefuture.Studyonbiohydrogen,coveringgenetic,physiologicalandbiochemicalaspects,hasbeenactivelypursuedinthelast100years,intheattempttoproducerenewableH2,particularlyrenewable“s…  相似文献   

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