[研究论文]狗狗便便时身体与地磁感线相平行

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1、RESEARCHOpenAccessDogsaresensitivetosmallvariationsoftheEarthsmagneticfield1,PetraNovakov19ErichPascalMalkemper2?,SabineBegal??,VladimHenzal,Milo?Je?ek1,VlastimilHart1Toma?Ku?tdVeronikaNemcova1,JanaAdamkovRKate?inaBenediktov1,aJaroslav?erveny1andHynek

2、Burda12*AbstractIntroduction:SeveralmammalianspeciesspontaneouslyaligntheirbodyaxiswithrespecttotheEarth§magneticfield(MF)linesindiversebehavioralcontexts.Magneticalignmentisasuitableparadigmtoscanfortheoccurrenceofmagnetosensitivityacrossanimaltaxawi

3、ththeheuristicpotentialtocontributetotheunderstandingofthemechanismofmagnetoreceptionandidentifyfurtherfunctionsofmagnetosensationapartfromnavigation.Withthisinmindwesearchedforsignsofmagneticalignmentindogs・Wemeasuredthedirectionofthebodyaxisin70dogs

4、of37breedsduringdefecation(1,893observations)andurination(5,582observations)overatwo-yearperiod・Aftercompletesampling,wesortedthedataaccordingtothegeomagneticconditionsprevailingduringtherespectivesamplingperiods.Relativedeclinationandintensitychanges

5、oftheMFduringtherespectivedogwalkswerecalculatedfromdailymagnetograms.DirectionalpreferencesofdogsunderdifferentMFconditionswereanalyzedandtestedbymeansofcircularstatistics・Results:DogspreferredtoexcretewiththebodybeingalignedalongtheNorth-Southaxisun

6、dercalmMFconditions・ThisdirectionalbehaviorwasabolishedunderunstableMF.Thebestpredictorofthebehavioralswitchwastherateofchangeindeclination,i.e.,polarorientationoftheMF.Conclusions:Itisforthefirsttimethat(a)magneticsensitivitywasprovedindogs,(b)ameasu

7、rable,predictablebehavioralreactionuponnaturalMFfluctuationscouldbeunambiguouslyproveninamammal,and(c)highsensitivitytosmallchangesinpolarity,ratherthaninintensity,ofMFwasidentifiedasbiologicallymeaningful.Ourfindingsopennewhorizonsinmagnetoreceptionr

8、esearch.SincetheMFiscalminonlyabout20%ofthedaylightperiod,ourfindingsmightprovideanexplanationwhymanymagnetoreceptionexperimentswerehardlyreplicableandwhydirectionalvaluesofrecordsindiverseobservationsarefrequentlycompromisedbyscatter.Keywords