巢湖春夏季节蓝藻与大型枝角类的相互作用-研究

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1、摘要utilizationoflargecladoceransusingsingle-cellofMicrocystis，Astorevealtheinteractionmechanismofcyanobacterialandlargecladocerans．Themainresultsandconclusionsareasfollows：1、LargecladoceransDaphniahyalineandDaphniapulexdominantinspring(March-May)，themaximumdensitywere79．5ind．／L(inApril)and30．

2、5ind．／LfinApril)．ThedensityofD．carinatasurpassD．hyalineandD．pulexinjuneandthemaximumdensitywas56ind．／LandthreelargecladoceransalmostdisappearedinJuly．PerasoncorrelationanalysisshowedthatthedensityofD．pulexhasaverysignificantpositivecorrelationwithtotalnitrogenandtotalphosphorus．HoweveLtheden

3、sityofD．hyalinehasnorelevancewithtotalnitrogen．buthasaverysignificantpositivecorrelationwimthetotalphosphorus．Inaddition．thedensityofD．carinataalsohasverysignificantpositivecorrelationwitllchlorophylla．PerasoncorrelationanalysisshowedthatthedensityofDaphniahassignificantlynegmivelycorrelatio

4、nwithmicrocystinbiomass(P<0．05)．TheresultssuggestedthatcolonialMicrocystisaeruginosa，foodqualityandquantityarethemainreasonsfortheweakeningordisappearanceofDaphnia2、ThepopulmiondensityofMirrasaWassignificantlyhigheratthehigherbiomassofM．aeruginosathanatthelowerlevelunderbothculturetypes．D．ca

5、rinatamaintainedhigherpopulationdensityatthebiomassof0_1OmgmforMaeruginosaunderthesingle-speciesculture，butwasstronglyinhibitedathigherbiomassf20mg／L)．MirrasadominatedoverD．carinataintheirinterspecificcompetitionwithincreasedMaeruginosabiomassunderthemixedculture．TheinfluenceofM．aeruginosaon

6、thepopulationdensityofD．carinataWassignificant(single—speciesculture，P=0．017；mixedculture，P

7、duallydeclinedunderthemixedculture．TheeffectsofM．aeruginosaonthecumulativeephippianumberofM．irrasaandD．carinataweresignificantundersingle—speciesandmixedcultures伊<0．01)．RegardlessofcolonialM．aeruginosa．smaller-bodiedM．irrasadominatedwhenV巢湖春夏季节蓝藻与大