小毛足鼠繁殖活动的季节变化(英文)  

Seasonal changes in desert hamster Phodopus roborovskii breeding activity

作　　者：Natalia Yu FEOKTISTOVA Ilya G. MESCHERSKY 

机构地区：[1]Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,Leninskii pr.33,Moscow 119071,Russia,Severtsov Institute of Ecology and Evolution,Russian Academy of Sciences,Leninskii pr.33,Moscow 119071,Russia

出　　处：《动物学报》2005年第1期1-6,共6页ACTA ZOOLOGICA SINICA

基　　金：Thisresearchwasfundedbythegrantsfrom"ScientificBasicsofBiodiversityConservationinRussia"program

摘　　要：有关小毛足鼠 (Phodopusroborovskii)冬季活动和季节性繁殖模式的资料很少。九年来 ,我们在自然温度和光照条件下维持了一个实验室种群。这些自然条件说明其繁殖活动与野生条件下的很一致。甚至在零下 4 0度的冬季 ,罗氏仓鼠都不休眠。第一个繁殖高峰 (每 10对鼠繁殖 2 4窝 ,每窝平均 3 5只幼鼠 )在 4月份 ,第二个繁殖高峰 (每 10对鼠繁殖 2 9- 2 6窝 ,每窝平均 3 9- 3 6只幼鼠 )在 6 - 7月份。在秋季和初冬 ,繁殖强度降低到每 10对鼠产 0 1- 0 4窝 ,但繁殖并不完全终止。全年内 ,所有成年雄鼠可见下降的睾丸 ,雌鼠可见开放的阴道口。雄鼠的血液睾酮浓度在夏季最高 ,秋季和初冬降低。但是 ,独居鼠在最短的光周期和寒冷季节保持高的睾酮浓度。春季 ,睾酮平均水平显著升高 。Data on desert hamster Phodopus roborovskii winter activity and seasonal patterns of reproduction are scarce.During 9 years we maintain a colony of desert hamsters under natural temperature and light regimes.These natural conditions suggest that the data on breeding activity may be in a good accordance with that in the wild.None of observed animals showed signs of torpor or hibernation in winter-even at about 40 °C below zero.The first peak of breeding (2.4 litters born per 10 pairs and 3.5 pups per litter in average) occurs in April and the second one (2.9-2.6 litters per 10 pairs and 3.9-3.6 pups per litter in average) in June-July.In autumn and early winter,the intensity of breeding declines to 0.1-0.4 litters per 10 pairs but does not cease completely.All adult males have visible testes and all adult females have opened vaginas entries through the year.The averaged males'plasma level of testosterone,being maximal in summer,declines in autumn and early winter,but single hamsters keep their testosterone high even under shortest photoperiod and during cold months.In spring,average testosterone level significantly increases but does not reach summer values

关 键 词：小毛足鼠 繁殖 季节 

分 类 号：Q492[生物学—生理学]