Dental anomalies in the Japanese mole Mogera wogura from northeast China and the Primorsky region of Russia
Dental anomalies in the Japanese mole Mogera wogura from northeast China and the Primorsky region of Russia
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DOI：
10.1007/s13364-011-0050-0
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Motokawa, Masaharu
中科院分区：
文献类型：
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作者：
Asahara, Masakazu;Kryukov, Alexey;Motokawa, Masaharu
本文对中国东北和俄罗斯滨海边疆区的日本鼹鼠Mogera wogura Temminck，1842的241例牙齿异常进行了研究。最常见的牙齿异常是缺牙，即，P-2（18起）或P-3（1起）空缺。多生牙3例，其中2例形态异常。牙齿形态异常（6例）和不对称弯曲的喙（1例）也观察到。牙齿异常被发现在更高的频率在人口附近的北方范围限制的物种。这不是由尺寸效应引起的。我们认为，牙齿异常的高发病率是遗传漂变的结果，在边缘人群中增加。考虑到地下哺乳动物的性质，我们的研究结果表明，高频率的牙齿异常的边缘人口可能已经开始了牙齿公式的演变，如果parapatric或周边物种形成发生在这样的人群。
Dental anomalies in the Japanese mole, Mogera wogura Temminck, 1842, from northeast China and the Primorsky region of Russia were examined based on 241 specimens. The most frequent dental anomaly was oligodonty, i.e., missing P-2 (18 cases) or P-3 (one case). Supernumerary teeth were observed in three cases, two of which were characterized by abnormal shapes. Morphological abnormalities in teeth (six cases) and an asymmetrically curved rostrum (one case) were also observed. Dental anomalies were found at higher frequencies in populations near the northern range limit of the species. This was not caused by size effects. We suggest that the high incidence of dental anomalies was the result of genetic drift, which increases in marginal populations. Considering the nature of subterranean mammals, our results suggest that the high frequency of dental anomalies in a marginal population could have initiated the evolution of dental formulae if parapatric or peripatric speciation occurs in such populations.