关键词: 高原鼠兔, 交配期, 求爱行为, 交配行为模式

Abstract: Pattern of copulation behavior in marked population of plateau pika (Ochotona curzoniae ) were studied for a 4-year period，1985-1988 at Heimahe Town by Qinghai Lake．The breeding period might be divided into 3-5 mating seasons，and the numbers of which differ from year to year．The male copulated with the female occurred at the activity centers of the female on the ground．Courtship behavior of the male pika might closely follow the female, male pika initiated making mouth to mouth, mouth to nose, ornose to nose contact with the female．sniffed the female s buttocks and genital region ("Cloaca"),and occurred multiple mounting with front feet moving from side to side on the back region of the female within the same family group，but courtship behavior among intruded males were not occurred．Posture assumed during copulation，the male used his upper 1imbs to grip the female's waist．The female also displayed a complex pattern of species typical sexual behavior that as nature of the receptive posture displays "Lordosis" and genital reflection．A single pelvis deep thrusting can attain ejaculation and then does dismount at once．There appears to be no lock．A number of pelvis thrusting may precede intronission and serves to locate the vagina， pelvic thrusting occur at rate of about 1-2 per second，thrusting stops once the intromission is achieved．Ejaculation is attained on a single intromission that it last less than 1 second．Per copulation is quite rapid，lasting from 3 to 5 seconds．Multiple ejaculations are common．Multiple ejaculations occurs, from 10 A.M .to 8 P.M .and most of them were 8 times in a day，a single male might copulate with a female 3 times with in an hour.From the beginning of the second mating season, the female was found to be copulating right at the eveof the parturition．．

Key words: Plateau pika, Mating period, Courtship behaviors, Pattern‘of copulatory behavior