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題名 | New Records of the Polynesian Rat Rattus exulans (Mammalia: Rodentia)from Taiwan and the Ryukyus=臺灣及琉球兩地玻里尼西亞鼠(Rattus exulans)之新記錄 |
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作者 | 本川雅治; 盧高宏; 原田正史; 林良恭; Motokawa, Masaharu; Lu, Kau-hung; Harada, Masashi; Lin, Liang-kong; |
期刊 | 動物研究學刊 |
出版日期 | 20011000 |
卷期 | 40:4 2001.10[民90.10] |
頁次 | 頁299-304 |
分類號 | 389.87 |
語文 | eng |
關鍵詞 | 玻里尼西亞屬; 家鼠; 臺灣; 宮古島; 新記錄; Rattus exulans; Rattus rattus; Taiwan; Miyakojima island; New record; |
中文摘要 | 本路究為玻里尼西亞鼠(Rattus exulans)於臺灣與琉球之新記錄。有三個標本採自臺灣東部花蓮縣吉鄉光華村,另外兩個標本則來自屬於琉球列島南部的宮古島地區。此種老鼠是從南亞地域的島嶼隨著船侵入臺灣與琉球。以頭骨測距為基礎可區吸玻里尼亞亞鼠與年幼的家鼠(R. exulans):玻里尼西亞鼠有二個測值遠小於家鼠,即第一上臼齒的左右寬度與第一上臼齒冠的寬度。來自臺灣與琉球的玻里尼西亞鼠標本的下顎齒列齒槽長皆小亞及太平洋島上的同物種。因此,此特徵可能有用於瞭解玻里尼西亞鼠分布於最北端臺灣與琉球兩地族群的來源。臺灣的玻里尼西亞鼠之核型與其他地區玻里尼西亞鼠所發表過的核型報告並無差異。 |
英文摘要 | The Poynesian rat Rattus exulans (Mammalia: Rodentia: Muridae) is newly recorded from Taiwan and the Ryukyus on the basis of 3 specimens from the lowland area of Kuanghua, Hualien County, eastern Taiwan, and 2 from Miyakoijma Island, the southern Ryukyus. This rat may have been introduced by ships sailing to Taiwan and theRyukyus from other islands where the species occurs. The morphological identifiecation of R. exulans from young R. rattus is established on the basis of cranial measurements. In R. exulans, two measurements (breadth across the 1st upper molar and coronal width of the 1st upper molar) are smaller than corresponding values in R. rattus. The alveolar length of the maxillary toothrow is smaller in R. exulans from Taiwan and the Ryukyus than in available conspecific samples from Southeast Asia and other Pacific islands. Thus, this character may be useful in detecting the origin of the northernmost populations of R. exulans represented by the present specimens. The karyotype obtained from one of the Taiwanese specimens does not differ from that previously reported for R. exulans. |
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