Seasonal changes in chronic social interactions and physiological states in female rat-like hamsters (Tscheskia triton)
Seasonal changes in chronic social interactions and physiological states in female rat-like hamsters (Tscheskia triton)
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DOI：
10.1016/j.physbeh.2006.07.006
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发表时间：
2006-10
影响因子：
2.9
通讯作者：
Dawei Wang;Jian-Xu Zhang;Zhenlong Wang;Zhi-bin Zhang
中科院分区：
文献类型：
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作者：
Dawei Wang;Jian-Xu Zhang;Zhenlong Wang;Zhi-bin Zhang
我们研究了雌性类大鼠仓鼠（Tscheskia triton）（以前称为仓鼠）的与独居生活方式和支配-从属关系相关的行为特征和生理状态。在非繁殖季节和繁殖季节捕获野生成年仓鼠并单独关在实验室中。连续 28 天，实验仓鼠每天将两只不熟悉且体重匹配的雌性仓鼠在中性场地配对，进行 5 分钟的二元相遇。第一周内每天对攻击行为、防守和侧翼盯防进行量化，在过去 3 周内每周量化一次。然后对动物进行尸检并评估其生理和生殖状态。我们的结果表明，尤其是在非繁殖条件下，可以建立主导-从属关系，其中主导者表现出比对手更高的攻击性和侧翼标记，以及更低的防御力。繁殖中的雌性遵循这种模式，只是伴侣之间的攻击行为没有差异。反复的接触似乎并没有减少攻击性或导致友善的行为或联系。实验结束时，繁殖雌性比非繁殖雌性表现出更高水平的血清雌二醇、孕酮和皮质酮。非繁殖状态下的优势雌性和从属雌性的卵巢和子宫均萎缩，而繁殖状态下的优势雌性和从属雌性的卵巢和子宫均肥大。非繁殖雌性比繁殖雌性拥有更重、更厚的胁腹腺。占主导地位的雌性比从属的雌性表现出更长或更厚的胁腹腺。因此，我们的数据表明，我们的实验中观察到的行为特征支持成年雌性类大鼠仓鼠的独居生活方式，并且生理状态显示出社会等级之间或两个季节之间的一些差异。
We examined the behavioral characteristics and physiological states related to solitary lifestyle and dominant–subordinate relationships in female rat-like hamsters (Tscheskia triton), formerly known as Cricetulus triton. Wild adult hamsters were captured and caged singly in the laboratory during the non-breeding and breeding seasons. The experimental hamsters were subjected to 5 min staged dyadic encounters every day for 28 consecutive days by pairing two unfamiliar and weight matched females in a neutral arena. Aggressive behavior, defense and flank marking were quantified everyday within the first week and once each week during the last 3 weeks. Animals were then autopsied and their physiological and reproductive state assessed. Our results suggested that dominant–subordinate relationships could be established especially in non-breeding conditions, where the dominant displayed higher aggression and flank marking, and lower defense than its opponent. The breeding females followed this pattern except there was no difference in aggressive behavior, between the partners. The repeated encounters did not appear to reduce aggression or lead to amiable behavior or bonding. At the end of the experiment breeding females exhibited higher levels of serum estradiol, progesterone and corticosterone than non-breeding females. Both dominant and subordinate females in non-breeding condition had atrophied ovaries and uteri, whereas both dominant and subordinate females in breeding condition had hypertrophied ovaries and uteri. Non-breeding females possessed heavier and thicker flank glands than breeding females did. Dominant females displayed longer or thicker flank glands than subordinate did. Thus, our data suggest that the behavioral traits observed in our experiment support the solitary lifestyle of adult female rat-like hamsters and physiological state show some differences between social ranks or in both seasons.