Caudal Vertebral Fragilities Related to Loss of a Tail Part in Two Species of the Japanese Field Mice

IF 0.8 4区 生物学 Q3 ZOOLOGY Mammal Study Pub Date : 2022-03-15 DOI:10.3106/ms2020-0056
M. Iwasa, Atsushi Hasegawa
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Abstract

Abstract. In the Japanese field mice, Apodemus argenteus and A. speciosus, loss of a tail part has often been observed under natural conditions. Such loss is considered a way of avoiding damage during physical accidents and attacks. Here, we studied the types of losses, types of caudal breakages, and breakage positions along the tail. The losses mainly consisted of intervertebral breakage (inter-VB) and intravertebral breakage (intra-VB). VB occurred widely along the tail in both Apodemus species and showed no specific tendency for the inter-VB positions. Intra-VB was confirmed at caudal vertebrae of the middle portion of the tail, consisting of vertebrae with lower relative width (minimum width/maximum length in each caudal vertebra) ranges showing a mean of approximately 0.15–0.28 in both Apodemus species. Previous studies in lizards and rodents found autotomic inter-VB and intra-VB to be positioned in a specific small portion of the tail. However, we found that in field mice, inter-VB and intra-VB were widely distributed along the tail without a regular position. Therefore, it is suggested that both inter-VB and intra-VB as self-defense ways in Apodemus appear to be mere torn-off breakages rather than autotomies, due to certain fragilities in intra- and intervertebral structures.
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两种日本野鼠尾部缺失引起的脊椎脆性
摘要在日本的小白鼠,Apodemus argenteus和A.specious中,在自然条件下经常观察到尾巴部分的缺失。这种损失被认为是避免在人身事故和袭击中造成损害的一种方式。在这里,我们研究了损失的类型,尾部断裂的类型,以及沿着尾部的断裂位置。损失主要包括椎间盘破裂(VB间)和椎管内破裂(VB内)。在两种Apodemus中,VB都广泛分布在尾部,并且在VB之间的位置没有表现出特定的趋势。在尾部中部的尾椎骨处确认了VB内,该尾椎骨由相对宽度较低(每个尾椎骨的最小宽度/最大长度)的椎骨组成,两种Apodemus的平均值约为0.15–0.28。先前对蜥蜴和啮齿类动物的研究发现,VB间和VB内的自体位于尾巴的特定小部分。然而,我们发现在野外小鼠中,VB间和VB内沿着尾巴广泛分布,没有规则的位置。因此,由于Apodemus体内和椎间结构的某些脆弱性,VB间和VB内的自卫方式似乎都只是撕下的碎片,而不是自残。
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来源期刊
Mammal Study
Mammal Study ZOOLOGY-
CiteScore
1.70
自引率
20.00%
发文量
23
审稿时长
>12 weeks
期刊介绍: Mammal Study is the official journal of the Mammal Society of Japan. It publishes original articles, short communications, and reviews on all aspects of mammalogy quarterly, written in English.
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