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实施不育后高原鼠兔攻击行为及激素水平变化的研究

魏万红,樊乃昌,周文扬,杨生妹,景增春,曹伊凡   

  1. 中国科学院西北高原生物研究所, 西宁
  • 出版日期:2006-06-12 发布日期:2008-07-07

THE CHANGE OF AGGRESSIVE BEHAVIOUR AND HORMONE CHANGE OF PLATEAU PIKA AFTER CONTRACEPTION CONTROL

WEI Wanhong,FAN Naichang,ZHOU Wenyang,YANG Shengmei,JING Zengchun,CAO Yifan   

  • Online:2006-06-12 Published:2008-07-07

摘要: 在高原鼠兔的繁殖盛期选定怀孕雌鼠和发情雄鼠各20 只, 采用所选雌性不育剂和雄性不育剂的半不育剂量分别对10 只雌鼠和10 只雄鼠进行处理, 通过室内雌雌、雌雄、雄雄配对实验对20只处理个体和20只对照个体的攻击行为进行了研究,同时对其生殖激素的水平进行了测定。结果表明: (1) 不育处理后, 雌雄动物的活动性降低, 亲昵行为持续的时间增加, 攻击行为及防御行为持续的时间和发生频次明显低于对照组个体; (2) 在各组内, 雌雄动物均具有相同的攻击水平; 同性动物之间的攻击性明显比异性动物之间高; (3) 当动物相遇后, 首先表现出高的攻击性和防御性, 而相互熟悉后, 对照组内个体的攻击性和防御性又有增加, 而处理组内个体以亲昵为主; (4) 在攻击行为中, 对照组个体以进攻为主, 首次相遇以进攻和追逐成分最多, 而后转变为进攻姿态; 处理组个体以进攻或进攻姿态为主, 首次相遇则同时表现出高的进攻、进攻姿态和追逐, 尔后三种成分均有降低; (5) 处理组内雌雄动物体重下降, 但卵巢重和睾丸重与对照组个体比较没有差异, 雄性处理个体睾丸组织中睾酮含量明显下降, 而血液中睾酮、雌二醇及孕酮含量与对照个体基本相同; 雌性处理个体血液中睾酮、雌二醇及孕酮含量均低于对照个体。以上结果表明, 对高原鼠兔实施不育处后, 激素水平的变化可能引起攻击行为的变化, 而攻击行为的变化可能使等级、社群结构和婚配制发生变化, 从而影响动物的繁殖状态。

关键词: 高原鼠兔, 攻击行为, 激素, 不育控制

Abstract: Forty individuals (male for 20 and female for 20) were selected to study in reproductive period of plateau pika. Ten males and ten females were treated with male sterilant and female sterilant, respectively. Through comparison between female-female, female-male and male-male within treatment group and within control group, the aggressive behaviour was studied and hormonal level was determined. The results showed that : 1) After treatment with sterilants, both male and female increased their rest time and decreased their active time, their amicable time increased and aggressive and defensive time decreased, this increased tolerance each other compared with individuals of control group; 2) Within treatment group and with control group, females and males had same aggressive intensity. Intersexual aggression was significantly lower than intrasexual ; 3) When firstly meeting, every individual displayed high aggression and defense when knowing each other, individual within treatment group again increased aggression and defense, but individual with control group displayed high amicable behaviour; 4) Among aggressive behaviour, individual within control group had high attack component, firstly used the attack and chase when met each other, then changed for offensive position, and individual with treatment group had high attack or offensive position, firstly used attack, chase and offensive position when met each other, then significantly decreased these three aggressive components; 5) After treatment with sterilants, the weight of individuals decreased, but the weights of ovary and testicle had no difference compared with individuals of control group. Within treatment group, the testosterone of testicle tissue for male significantly decreased, but the testosterone, estradiol and progesterone of blood were same as male within control group; all of testosterone, estradiol and progesterone of blood for female were lower than that of female within control group, meanwhile the progesterone of ovary tissue was significantly lower than that female within control group. These indicated that the hormone change of plateau pika after treatment with sterilants could result in the change of aggressive behaviour, then made its dominant system and social structure change, this could affect pika’s reproductive status and fitness. Meanwhile the change of hormone could block reproductive process, this also affect pika’s reproduction.

Key words: Plateau pika ( Ochotona curzoniae ), Aggressive behaviour, Hormone, Contraception control