Age Dvision Of Dominant Rodent Species And Analysis Of Age Structure Under Different Disturbance In Desert Area

The sectionalization of rodent age have a far-reaching ecological significance for its' age structure and population density variation,and used weight to sectionalized age group is useful in the wild experiment.All of the five-toed jerboa(Allactaga sibirica),northern three-toed(Dipus sagitta)and mid-day jird(Meriones meridianus)that are the dominant species which are distributed in the alxa desert area widely.sectionalayed these species' age group are the effective way to study its life characteristics in them life-history.There are few correlational research in the domestic and international.Based on the systematic clustering method,the weight of five-toed jerboa,captured in 2012-2014,were analysised,and these three species were divided into different age groups and construct the model between body mass and other body characteristics,then we analysis the population distribution and the seasonal dynamics of Population structure in different disturbance type.the results show that1.we sectionalize all of the five-toed jerboas(age group ?: 60-80g;Age group ?:80-110 g ?: >110g),the northern three-toed(age group ?: 60-80g;Age group ?:80-110g;Age group ?: >110g),mid-day jird(age group ?: 60-80g;Age group ?:80-110g;Age group ?: >110g)into three age groups respectively.2.These body characteristics' growth are skimble-scamble and some one characteristic may begain to grow in a particular stage,The ear length of the five-toed jumper was completed before I age,the body length and tail length were dominant at I age,and the hind foot began to grow rapidly at ? age.The body length of the three-toed jumper grows at three ages,the ear length mainly grows at the second age,and the tail length and the hind foot grow irregularly.The body length of Meridian gerbils was dominant at the age of 3 years and the growth of the hind foot was dominant at the age of 3 years,but the growth of the four indexes before the age of ? was irregular.3.The population distribution of these three species are different in the different disturbance type.The age structure of the five-toed jerboas and three-toed jerboas rodents under different grazing patterns was dominant in the age group ?,but the number of individuals in the age group ? was larger than that in the age group ?.The number of individuals in the age group ? was larger than that in the age group ?,and the age group ? was the dominant group in the whole year under the different grazing modes,and the number of individuals in the age group ? was higher than that in the age group ?.The number of individuals in the age group ? was larger than that in the age group ?.4.In terms of seasonal variation,the age structure of three species of rodents has certain regularity.The ? age group was the dominant group in spring and summer,and the individual advantage was in ? age group in autumn.The ? age group was dominant in spring and summer,and the individuals in ? age group increased significantly in autumn.Meridian gerbils were dominant in ? age group in the three seasons.