Abstract：We studied the effects of maternal stress induced by high density on an offspring sex organ index by experimentally altering population densities of root voles (Microtus oeconomus) in field enclosures. High-and low-density enclosed parental populations were established, from which we obtained offspring that were used to establish two low-density offspring populations, respectively, which consisted of 6 F1 voles of each sex originating from either high- or low-density parental populations, and a high-density offspring population, which consisted of 30 F1 voles of each sex from high-density parental populations. The remaining F1 individuals were transferred to cages in the laboratory. Adults of the high-density parental populations had higher corticosterone levels, an indication of physiological stress, than did those of the low-density parental populations. F1 voles from low-density parental populations, when in low-density F1 populations, displayed a greater sex organ index than did F1 voles from high-density parental populations in high-density F1 populations, but the corticosterone level was inverse. The sex organ index and corticosterone level did not differ between the F1 individuals from both low-and high-density parental populations,when in low-density F1 populations. In laboratory, a significant difference in testicle index was not observed between F1 offspring from high-density and low-density parental populations. The results suggest that maternal stress alone induced by high density, did not affect the sex organ index of their offspring, but prenatally stressed offspring displayed a reduced sex organ index when they were exposed to high density during the breeding period.
杨乐,吴雁,伊凡, 陈芳,边疆晖,陈志. 围栏条件下母体密度应激对根田鼠F1 代性器官指数的影响[J]. , 2011, 31(2): 164-170.
YANG Le1,WU Yan,CAO Yifan,CHEN Fang,BIAN Jianghui,CHEN Zhi. Effect of maternal density in field enclosures on sex organ index of F1 offspring in root voles (Microtus oeconomus). , 2011, 31(2): 164-170.
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