Mating System Of Lasiopodomys Brandtii

Human activities significantly affect ecosystems,and grazing is a major anthropogenic disturbance factor that has a complex impact on the population density of grassland small rodents.The marriage system is an important factor affecting the population dynamics of animals,which directly affects the structure of the population.The mating system is malleable,and food resources may affect spouse selection by affecting the dynamics of the population.Brandt's vole is one of the main rodents in Inner Mongolia grassland,and it has great destructive power to grassland vegetation,which seriously affects the development of animal husbandry and agriculture in China.In order to study the influence of human disturbance(grazing)on the population dynamics of grassland animals,the relationship between the marriage system and the genetic structure of the population was explored.In this study,the large-scale environmental factor simulation experiment fence of the Inner Mongolia Grassland Animal Ecology Research Station was used to carry out different degrees of grazing treatment on the population of Brandt's voles,with the control group(C),the light grazing group(LG)and the moderate grazing group(MG).The fenced population was animal material,and the genetic structure of the Brandt's voles population in three enclosures was analyzed using highly polymorphic microsatellite genetic markers.And the identification of parent-child relationship between the two grazing fence individuals.By analyzing the pairing relationship between male and female,the marriage system of Brandt's vole was discussed.The results showed that:(1)All the 11 microsatellite loci were highly polymorphic loci,100,118 and 86 alleles were detected in three enclosure,respectively.The average number of alleles at each locus was 10,11 and 8 respectively.(2)In the three enclosures,the average of observed heterozygosity was 0.715,0.696 and 0.774,respectively;The average heterozygosity was 0.782,0.776 and 0.734,respectively;the average polymorphic information content is 0.753,0.742 and 0.689,respectively.(3)In the light grazing group,seven families were identified with males as the main breeding individuals.In the moderate grazing treatment group,four families were identified with male as the main breeding individual.Individuals in each family may have a kinship in a group of caves.The study also found inbreeding between the populations of Brandt's voles.The above results suggest that:(1)11 microsatellite loci are all highly polymorphic loci,which is a suitable molecular marker for studying the genetic structure and mating system of the population.(2)In this experiment,the three fenced populations showed higher genetic diversity,confirming that there was no difference in the genetic diversity of the three fenced individuals.(3)The marriage system of Brand's voles is a mixed system,with a male and female system.In this experiment,grazing did not have a significant impact on the marriage system.Through analysis,it was found that males compete more fiercely in their fences with greater grazing intensity.The results of the study preliminarily revealed the genetic structure of Brandt's voles,and confirmed the marriage pattern of Brandt's vole.It can provide a theoretical basis for the development of wild infertility control of Brandt's voles.The results of the study help to understand the mechanism of animal population fluctuations and provide a scientific basis for the development of grassland pest control measures.