Abstract—

Seasonal and age-related variability of the hippocampus in the bank vole (Clethrionomys glareolus) was monitored in a natural population from Moscow oblast. Autumn-born animals were compared at three stages of their life cycle: in autumn (1–3 months old), during the winter decrease of brain weight (5–7 months old), and after the spring “growth spurt” (9–11 months old). The winter sample exhibited significantly smaller (p < 0.05) section areas of ​​both the dentate gyrus and the CA3 field of the hippocampus. All studied divisions of the hippocampal complex—molecular and granule layers of the dentate gyrus, pyramidal cell layers, and fibers of the CA3 field of the hippocampus—exhibited a similar winter decrease (9.4–13.3%). In spring, hippocampal complex showed regrowth. In overwintered voles, the size of hippocampal divisions in summer surpassed that in the winter sample by 5.4–27.3%. The results indicate a considerable morphological plasticity of the main hippocampal structures in response to seasonal factors in nonwinter-sleeping rodents.

中文翻译：

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河岸田鼠海马建筑学的季节性变化（Clethrionomys glareolus，Rodentia）

摘要-

在莫斯科州的一个自然种群中监测了田鼠（Clethrionomys glareolus）海马的季节性和与年龄相关的变化。对秋天出生的动物在其生命周期的三个阶段进行了比较：秋天（1-3个月大），冬季大脑重量减轻（5-7个月大）和春天“生长突增”之后（9- 11个月大）。冬季样品显示出明显较小（p<0.05）齿状回和海马CA3区的截面积。所有研究过的海马复合体的分布-齿状回的分子和颗粒层，锥体细胞层以及海马CA3区域的纤维-都表现出类似的冬季减少（9.4-13.3％）。春季，海马复合体显示再生长。在越冬的田鼠中，夏季海马区的大小比冬季样本的大5.4％至27.3％。结果表明，在非冬季睡眠的啮齿类动物中，主要海马结构的形态可塑性对季节因素的响应。