Morphological Variation of the House Mouse Mus musculus and the Ryukyu Mouse M. caroli (Mammalia: Muridae) from Japan

IF 0.8 4区 生物学 Q3 ZOOLOGY
Mammal Study Pub Date : 2023-10-20 DOI:10.3106/ms2023-0014
Wai Min Thu, Takashi O. Yato, Shinya Okabe, Yuta Shintaku, Masaharu Motokawa
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引用次数: 0

Abstract

Morphological variation in the house mouse Mus musculus was examined based on five external body measurements and 25 skull measurements of 166 specimens from Honshu, Kyushu, Kikaijima Island, Okinoerabujima Island, Okinawajima Island, Miyakojima Island (my1 and my2), and Yonagunijima Island (yn) in Japan, as well as 99 specimens of M. caroli from Okinawajima Island (ca). In skull measurements, yn and my2 specimens were overlapped and distinct from the other localities in principal component analysis (PCA). Specimens of yn and my2 had shorter mandible heights. Although yn and my2 specimens overlapped with ca specimens in PCA using mandibular measurements, yn specimens had an elongated angular process reaching the posterior tip of the coronoid process, different from ca specimens with a more robust and long coronoid process. In this study, distinct morphological features were found on Yonagunijima Island. Specimens of my1 and my2 from Miyakojima Island differed from each other; my2 specimens were more similar to Yonagunijima Island specimens. The mandibular morphometric similarity between M. musculus from Yonagunijima Island and M. caroli from Okinawajima Island is presumably related to adaptations in producing similar mechanical advantages and equivalent masticatory forces.
日本家鼠小家鼠和琉球鼠的形态变异(哺乳动物:鼠科)
通过对日本本州、九州、菊海岛、冲野岛、冲绳岛、宫古岛(my1和my2)、与那原岛(yn)的166个家鼠标本和冲绳岛(ca)的99个卡罗氏支原体(M. caroli)标本的5次体外测量和25次颅骨测量,对家鼠小家鼠的形态学变异进行了研究。在颅骨测量中,yn和my2标本在主成分分析(PCA)中重叠,与其他部位不同。yn和my2的标本下颌骨高度较短。通过下颌测量,虽然yn和my2标本与ca标本在PCA中有重叠,但yn标本具有一个细长的角突,到达冠突的后尖端,而ca标本具有更坚固和更长的冠突。在与那原岛发现了明显的形态特征。来自宫古岛的my1和my2标本存在差异;my2标本与与那原岛标本更为相似。与那源岛m.s musus和冲绳岛m.s caroli下颌形态的相似性可能与产生相似的机械优势和等效咀嚼力的适应性有关。
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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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