【摘要】 本研究以28日龄的青春期雌性布氏田鼠作为亲代实验动物，每天分别暴露于蒸馏水、兔尿和猫尿60 min，连续18 d，成年后与正常雄鼠交配。随后检测其子代在28日龄(青春期)和90日龄(成年期)时暴露于这3种气味源的行为反应，以及下丘脑促肾上腺皮质激素释放激素、血浆促肾上腺皮质激素和皮质酮的基础水平。结果显示：与母体青春期暴露于蒸馏水的子代相比，暴露于猫气味的子代在青春期和成年期暴露于蒸馏水时行为没有变化；在成年期暴露于兔气味时探头行为减少；在青春期暴露于猫气味时隐藏行为增多，探头、嗅闻和自饰行为减少，在成年期时警戒性直立行为增多。此外，这些子代在青春期的血浆皮质酮水平升高，而成年后没有变化。以上结果表明母体在青春期重复暴露于捕食风险，其子代在面对相同的气味源时，青春期采用消极回避，而成年后采用主动防御的策略。不同阶段采用不同反捕食策略可能与HPA轴基础活动水平相关。母体青春期的捕食风险应激提高了后代的反捕食行为水平，具有“跨代传递”效应。更多还原

【Abstract】 In this study, 28-day-old female Brandt’s voles(Lasipodomys brandtii) were exposed to distilled water, rabbit urine, and cat urine for 60 min daily for 18 consecutive days, and paired with normal males when they became adults.The behavioral responses to these three odors and basal HPA axis(including hypothalamus corticotropin-releasing hormone, and plasma adrenocorticotrophic hormone and corticosterone) activity were measured in their offspring at 28 or 90 days old, respectively. The results showed that there was no significant difference in the behavioral responses to acute distilled water exposure between the offspring of cat odor(CO) group and distilled water(DW) group. When exposed to rabbit odor, adult offspring of CO group showed less head-out behavior than those of DW group. When exposed to cat odor, the adolescent offspring of CO group displayed more concealment, less head-out, sniffing and self-grooming, and the adult offspring showed more vigilant rearing when compared to the offspring of DW group. In addition, the basal CORT levels were increased in adolescence but not after adulthood when compared with the offspring of DW group.These results indicate that the offspring from the mothers repeatedly exposed to predation risk during adolescence tended to use passive avoidance strategies in adolescence and to adopt an active defense approach after adulthood to cope with this predatory risk. The adoption of different anti-predatory strategies in different development periods may be related to the basal levels of HPA axis activity. Maternal predation risk during adolescent period can promote the expression of anti-predatory behavior in offspring, reflecting a‘cross-generation transmission’ effect.更多还原