Research Of Takydromus Amurensis From Different Populations Of The Female Morphology And Reproductive Strategy And Temperature Ecological

Takydromus amurensis is heterothermic animal, it is proper material to study therelationship between environment temperature and body temperature. Takydromusamurensis in different area are studied by means of experiment. The main studyconsists of the temperature influence on Takydromus amurensis in breeding strategies,thermoregulation and hatchling. The main result and conclusion are following:First, the morphological characteristics of the female populations are measured.According to the data: Although the rainfall and temperature of the two populations’habitats are different, there is no different in the body figure （body length, belly length,head length, head width） of the female population.Eggs of Takydromus amurensis were incubated at four constant temperatures inorder to test the influence of incubation temperature on duration of incubation, size andmorphology of hatchlings. The brooding time of Takydromus amurensis from Shangzhiregion averaged at48.8d,31.6d,26.1d and25d under the temperature of24℃，27℃，30℃and33℃; The data of hatchingTakydromus amurensis from Kuandian regionaveraged at53.7d,41d,28.5d and28d. There are significant influence on the body’sweight, head and body’s length caused by hatching temperature.At the constant incubation temperature, the brooding time decreases as thetemperature increases. In four constant temperature conditions, the mass, snout-ventlength, head length and tail length of hatchlings would decrease as the incubationtemperature increases. It shows that the optimal constant incubation temperature is27℃.At lower temperature（24℃），the hatchlings are bigger，but the duration of incubationlengthened. It is proved that these two populations of Takydromus adapted to the coldclimate in Heilongjiang Province. There significant differences between twopopulations on temperature sensitivity and brooding time. The hatching period ofTakydromus amurensis from Kuandian region is longer than Takydromus amurensisfrom Shangzhi region. But Takydromus amurensis from Kuandian region is moresensitive on temperature change.The results show that the reproduction of two populations was influenced bymaternal characteristics which mean the maternal mass which had the significantinfluences and maternal snout-vent length had a linear positive correlation withreproductive output, fecundity and clutch frequency, but significance of difference varies. The maternal mass had significant influences in these four aspects for the reasonthat the nourishment and the living state of the maternal decided the body mass, besidesthe supply for the ordinary demand, the surplus could be used for reproduction. Andmaternal snout-vent length decided abdomen space and heredity, which could explainthe reason that the maternal snout-vent length has the linear positive correlation withreproduction.The research shows that there is difference between the two populations onreproduction. Takydromus amurensis from Shangzhi region keep the positivereproduction through the bigger egg, which assures that hatchling has the ability to live.But Takydromus amurensis from the Kuandian population has higher clutch frequency,so it can ensure the number of hatchings. Although Takydromus amurensis has thesmaller hatching from Kuandian region than that from Shangzhi region, increase thenumber of eggs may ensure the rate of survival.When the temperature of the external environment is low （20℃）, the meantemperature of the females are （32.49±0.705）℃in the non-gestation period. However,in the pregnancy period, the mean temperatures of the females are （33.90±0.674）℃,they were significantly higher after the pregnancy （F1,61=65.600，P＜0.001）. No matterthe pregnancy period or the non-gestation period, the mean temperatures of the femalesT. amurensis from Shangzhi region （33.39±0.909）℃are significantly higher than thefemales from Kuandian region （32.91±1.021）℃. It shows that the ability ofthermoregulatory is stronger in the area of higher latitude. The mean temperature of thefemales from Kuandian region are （31.94±0.590）℃, and that from Shangzhi regionare（31.60±1.268）℃after amputation of tail. The differenceis not significant betweenthe two populations (F_1,18=0.591, P>0.05), but the mean temperature is significantlylower than the individual which has the complete tail (F_1,18=9.854, P<0.05). The resultsshow that tail has influence on the thermoregulatory.