基于線粒體細(xì)胞色素b基因的大沙鼠系統(tǒng)地理格局.pdf

1、安徽大學(xué)碩士學(xué)位論文基于線粒體細(xì)胞色素b基因的大沙鼠系統(tǒng)地理格局姓名：寧恕龍申請學(xué)位級別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：周立志20070401Phylogeographicalpatternsbasedonmitochondrialcytochromebgeneofgreatgerbil(Rhombomysopimus)AbstractGreatgerbil(Rhombomysopimus)isatypicalsmallmammalspec

2、iesinnorthwestariddesertandsemi—desertregionsTostudythephylogeo伊aphyofgreatgerbilwillhelpUStounderstandtheoriginandtheevolutionofbiodiversityandthearidenvironmentvariationprocessofNeiMongolXinjiangWeexaminedDNAsequenceva

3、ria：cioninthemitochondrialcytochromebgeneof41greatgerbils(Rhombomysopimus)fromInnerMongoliaXinjiangandGansuprovincesandonefromIsfahan，IraninGenBanktobetterunderstandthePhylogeographicalpatternsinaridregionsofChinaWefound

4、thatamongthe1140bpofthemitochondrialcytochromebgene，50nucleotidesiteswerevariable(439％inthefullsequence)including48transitionand2transversionAtotalof23haplotypeswereidentifiedAmongthefourpopulations，haplotypediversityWaS

5、highhowevernucleotidediversityWaSlowCmeticvariationoccurredbothwithinpopulationsandamongpopulationsFstanalysisshowedthatthedifferentiationwassignificantfPO05)betweenthepopulationsofsemidesertincenterofInnerMongoli(CIM)an

6、dAlxandesert(ALX)，andextremelysignificantamongotherpopulationsPhylogenetictreeanalysisbasedonhaplotypesdemonstratedthreelineagesofgreatgerbilOnelineageincludesthespecimenfromChinaandasecondlineagefromIranThegeneticrelati

7、onshipbetweenIranianandChinesegreatgerbilWasfartherthanbetweenthetWOlineagesfromChinaTheChineselineageWasestimatedtobesplitbefore93thousandyearsNestedCladeAnalysisshoweda／lopatricfragmentationandcontinuouspopulationexpan

8、sionexistinginthehistoricpopulationofgreatgerbilThepopulationexpansionanalysisindicatedthatthegreatgerbilmighthaveexperiencedapopulationexpansionin119thousandyearsagoTheseresultsindicatedthatthegreatgerbilpopulationmight