經(jīng)驗影響捕食者的選擇——以克氏原螯蝦和大瓶螺為案例的研究.pdf

1、河北大學(xué)碩士學(xué)位論文經(jīng)驗影響捕食者的選擇以克氏原螯蝦和大瓶螺為案例的研究姓名：李婭申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：吳岷201105AbstractIIAbstractTheintroductionofnonnativeplantsanimalspathogensiscurrentlythemostseriouseenvironmentalthreatglobally.Thecolonizationofinvasivespecie

2、sinnewterritymightcausenotiousimpacttotheinvadedecosystemsodotolocalspecies.IusedtwoinvasivespeciesnamelytheredswampcrayfishProcambarusclarkii(fromNanjing)thegoldenapplesnailPomaceacanaliculata(fromHainan)asthepredatypre

3、ypairtostudywhenthistwolineagesofinvasivespecieswhichneverencountereachotherbefewerebroughttogetherwhatwillhappen.TotestthehypothesesthatthepredationwillbeinfluencedbythesizeofpreyinfluencedbyencounterrateIdesignedtheexp

4、eriencewherethepreywerecomposedofthreesizerank(smallsizeddlesizedlargesized).Twoexperimentsrespectivelyexaminedonewithpreyconsistedofthreesizegroupswiththesamebiomassanotherwithpreyconsistedofthreesizegroupswiththesamein

5、dividualnumbers.Thesecondpartoftheexperimentsistotestthehypothesisthatexperienceofthepredatwillinfluenceitssubsequentpredation.Theresultsofthepresentstudiesare(1)SubadultcrayfishhavethetendencyofpredatingGASofsmallsizes.

6、(2)InthesamebiomasswheresmallsizedsnailsaremuchmethandlesizedlargesizedsnailsinnumberPCalwaysconsumedsmallsizedGAS.InsamesnailnumberexperimentsencounterratewererelativelyenhancedtherefePCconsumedGASpreyotherthanofsmallsi

7、zed.(3)ThecrayfishwiththeexperienceofGASconsumptionshowedameefficientpredationrateincomparisiontothecrayfishwithoutsuchexperience.TheresultsshowedthatthesmallsizeofcrayfishtendtofeedGoldenapplesnailsointheearlyinvasivest

8、ageintroductionthenonnativepredatcanbeachievedmesatisfactyeffectivecontrolresults.Useofthetwoinvasivespeciesaspredatpreynotonlyfthepurposeofconsiderationofcontrolthestudyofthepredatybehavioftwoinvasivespecieshasimptantsi