Study on Reproductive Ecology of Phodopus roborovskii Population

The study was carried out on sandy pasture in the middle ten days of each month from April to October during 1991-1995 in Dalate County,Inner Mongolia.A total efforts of 101845 trap-day was made and 6325 rodents were captured among which 2217 specimens were Phodopus roborovskii.The results obtained were as follows:1) Sex ratio (♂/♀) of Phodopus roborovskii population in this area was close to 1∶1.2) The reproductive strength of both males and females increased with ages.3) Reproductive periods of males and females were from February to October and from March to October respectively.