Sexual Dimorphism And Geographical Variation Of Five Popuiations Of Rapid Racerunner(Eremias Velox)in Xinjiang Uygur Autonomous Region

We used287preserved adult rapid racerunner (Eremias velox) specimens, and which were categorized into5populations:Qoqek,Ili, Dzungarian Basin, Urumqi and Turpan Depression. Coefficient of variations, Allometry, Sexual Size Dimorphism Index and Principal Component Regression in8morphological traits and7scalation of rapid racerunner were calculated and analysed to observe and recognize sexual dimorphism and geographic variation pattern with changing factors of the habitats in our study area.The results showed that no significant differentiation supporting subspecies occurs in these regions. But substantial variations of femoral pores, interfemorals, scales between postmentals and collar and also transverse rows of ventral scales were observed (>30%). Different dimorphism pattern presented in rapid racerunner among5populations of Xinjiang:no dimorphism appeared in Qoqek population; female possessed larger head (p<0.01) and more femoral pores (p<0.05) in Ili population; male had bigger size, head, axilla-groin length and tail base width, and femoral pores (p<0.05) in Dzungarian Basin population; female had larger relative axilla-groin length and tail base width (p<0.05) in Urumqi population; male were bigger in size, head, axilla-groin length and tail base width (p<0.05), even more femoral pores (p<0.05) in Turpan Depression population. Allometries showed no differentiation of relative growth rate in Qoqek and Ili population; maie’s head lengrn and Hind limb grew faster (p<0.05) in Dzungarian Basin population; female’s axilla-groin developed slightly more rapidly (p=0.06) in Urumqi population; male won the contest of axilla-groin growth (p<0.05) but failed with hind limb one (p<0.01) in Turpan Depression population. The regression of Sexual Size Dimorphism Index (SSDI) demonstrated all but head length of male’s morphological traits increased relative size along the increasing longitude (p<0.05), more femoral pores and interfemorals with more annual precipitation (p<0.05).The geographic variation varied inter-sexually among populations. Except the relative axilla-groin length, all morphological traits of female shrank with increasing precipitation (p<0.05), longitudinal scales (=scales between postmentals and collar+transverse rows of ventral scales) reduced along with rising annual mean temperature (p<0.01), and femoral pores decreased with increased longitude (p<0.01); the variation of male’s morphological traits emerged visible longitudinal zonality, that is larger with higher longitude (p<0.05), but smaller with higher elevation (p<0.01), shorter relative limb length with incremental precipitation (p<0.01), more interfemorals and longitudinal scales with increasing longitude (p<0.01) and precipitation (p<0.01) respectively.The results can be drawn that that a certain pattern of dimorphism and geographic variation mode is a coincidental combination forged by a series of dissimilar ecological factors like precipitation and elevation, different selection pressures like sexual selection and nature selection simultaneously. So climate change could have this animal impacted profoundly. Separate strategies to adapt and evolve were commonly chosen by different species, by different gender within a species was a bizarre phenomenon that we observed.