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ID:33015937
大小:3.70 MB
页数:50页
时间:2019-02-19
《巢湖春夏季节蓝藻与大型枝角类的相互作用-研究》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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,P7、duallydeclinedunderthemixedculture.TheeffectsofM.aeruginosaonthecumulativeephippianumberofM.irrasaandD.carinataweresignificantundersingle—speciesandmixedcultures伊<0.01).RegardlessofcolonialM.aeruginosa.smaller-bodiedM.irrasadominatedwhenV巢湖春夏季节蓝藻与大
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
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