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1、背角无齿蚌对浮游藻类的滤食选择性与滤水率研究应用生态2005年12月第16卷第12期CHINESEJOURNALOFAPPLIEDECOLOGY,Dec.2005,16(12):2423--2427背角无齿蚌对浮游藻类的滤食选择性与滤水率研究*吴庆龙一陈宇炜刘正文(中国科学院南京地理与湖泊研究所,南京210008)1引言【摘要】以滇池及其附近水体中分布的背角无齿蚌为研究对象,分析其滤水速率及相关的影响因素,研究其食物组成和滤食浮游藻类的选择性,并初步估算其自然种群的滤水能力和控制浮游藻类的潜力.结果表明.背角无齿蚌
2、的滤水率有一定的日变化,傍晚时较高;滤水率与水体中的悬浮物质含量密切相关,随着悬浮物质浓度增加而减少;滤水率与蚌的个体大小有关,体重增加,滤水率下降.对比水体中与蚌消化道内浮游藻类所占的百分比,发现其对浮游藻类的滤食没有显着的选择性.自然水体中背角无齿蚌的滤水能力很低.关键词背角无齿蚌滤水率滤食选择性浮游藻类文章编号1001—9332(2005)12—2423—05中图分类号Q178文献标识码AFilteringcapacityofAnodontawoodianaanditsfeedingselectivityon
3、phytoplankton.WUQinglong.CHENYuwei,UUZhengwen(№nj;ingInstituteofGeograandLimnology,ChineseAcademyofSciences,Nan～ing210008,C^ina).一C^n.J.App1.EcDZ.,2005,16(12):2423～2427.LakeeutrophicationassociatedwithalgalbloomhasbecomeamajorenvironmentalchallengeinChina.Filt
4、erfeedingorganisms,e.g.,silvercarp,bigheadcarp,andzebramussel,havebeenwidelyusedtomanipulatewaterenvironmentthroughtheirtop.downeffects.ThebivalveAnodontawoodianaiswidelydistributedacrossChina,andhasbeenusedforbio-manipulationofsomewaterbodies.Insituexperiment
5、swereperformedinabayofLakeDianchianditssurroundingpondstostudythefilteringcapacityandthefilterfeedingrateofAnodontawoodianaintheseaguatichabitats,andtodeterminethecontrollingfactors.Theresultsshowedthattherewasarelationshipbetweenfiltrationrateandtotalsuspende
6、dsubstancesmeasuredinlaboratoryduringAugustandSeptember2001whenthewatertemperaturewas20±2℃,whichwasexpressedasy=4380.41e'(R=0.621.P<0.05)basedonatleastsquaresanalyses.Thefiltrationratewasstron【glyrelatedtothebodyweightbymeasuringinlaboratoryover24hoursdurin
7、gAugust2001whenthewatertemperaturewas20±2℃.AtleastsquaresanalysesgavetheequaffonY=2904.16+12076.248—0003(R=0.9825,P=<0.o5)Aslightvariationoffiltrationratewasfoundover24hours.whichcouldbeexplainedbythebivalves'adaptationtotheexperimentalcircumstancesratherth
8、anthedailychangeofitsfiltrationfeeding.Ingeneral.thefiltrationcapacityofnaturalAnodontawoodianapopulationinthewaterbodieswasverylimited.asaresultofitssmallpopulationsize.Nosignific
