珠江口水域鱼类群落结构分析

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1、winter,manyspeciessvcaintoopenseaforoverwintering．Fromtheadaptivesalinityoffishes，thefishesdistributionshowedobviousspatialandtemporalvariationsinthePearlRiverEstuaryWaters，thedistributionofspeciesandnumberoffi'eshwater,brackishwaterandseawaterfishespresentedasignificantsalinity

2、gradient．Alongwiththesalinitygradientvariationfromthetopofestuarytoopensea,thespeciestransitedgraduallyfromfreshwaterfishes，brackishwaterfishestoseawaterfishes．AmongthemthedistributionscopeofbrackishwaterandseawaterfishesCanextendedinwardtoLotusHill-Humenwatersandmostofthemweres

3、mallarladromousandcoastalfishesthatspawnedandfedindryseasoninthewaters，whilethebrackishwaterfishesextendedoutwardnomorethancoastalwaters．Accordingtothermophily,warmfisheswerethechiefspecies，followedbywarm-temperatespecies，andonlyonecold—temperatespeciewascapturedinoffshoreandope

4、nsea,thisreflectedthefishescompositioncharactersoflndo—West—Pacificregion．TherewasmarkeddifferenceindominantspeciesineachwatersofPearlRiverEstuary．Therewere2brackishwaterspecies,Coiliagrayii,Ariussinensisand3雠shwaterspecies，Megalobramahoffmanni，Cirrhiusmolitorella，Ctenopharyngod

5、onidellusinLotusHill．Humenwaters；2diminutivebrackishwaterspecies,CollichthyslucidusandCoiliamystuswereabsolutelypredominantinindividualandbiomassinLingdingyangwaters，whichweremoreconcentrative；thereweremainlyseawaterspeciessuchasCaranxkalla,Trichiurushaumela，pampusargenteusetc，a

6、ndbrackishwaterspeciessuchasThrissadussumieri，Thrissakammalensiseteincoastalshallowsea；asthereweremorespeciesinoffshoreandopensea,thedominanceofdominantspeciesWasnotsignificant，ThamnaconushypargyreusWastheonlydominantspecies．Dominantspeciesofwholewatersshowedanobviousseasonalvar

7、iation,thedominantspeciesinestuaryandshallowseaweremarkeddifferencetooffshoreandopensea,LeiognathusbindusandSauridatumbilweretheonlysamespeciesbetweenthem．Thedominantspeciesinestuaryandshallowseawere1speciesinspring，12speciesinsummer,5speciesinautumnand10speciesinwinterrespectiv

8、ely．AmongthemCaranxkalla，Collichthyslucidus,Coi