Presence of Feces in the Abandoned Nokado Mine, Tochigi Prefecture of Central Japan, Provides Further Evidence of Cave Use by Japanese Macaques  [in Japanese] Presence of Feces in the Abandoned Nokado Mine, Tochigi Prefecture of Central Japan, Provides Further Evidence of Cave Use by Japanese Macaques  [in Japanese]

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Abstract

<p>2015年10月に栃木県日光市野門鉱山の廃鉱で,ニホンザル(<i>Macaca fuscata</i>)の糞を大量に発見した。ニホンザルの糞が見つかった場所は坑道の入り口から8 m以内の2か所で,いずれも1-2m<sup>2</sup>の狭い範囲に100個以上の糞断片で密集していた。糞が数珠状につながった複数の断片から構成されること,内容物がほぼ樹皮で構成されることから,ニホンザルの群れが冬季(12月~3月)に坑道を利用したことが示唆された。2014年から2015年にかけての冬季は例年より雪の量が多かったため,ニホンザルは激しい雪や風を避けるために坑道を利用したと考えられる。野門鉱山の利用は,ニホンザルによる冬季の洞窟利用としては2例目の報告だが,人間活動により作られた人工的な洞窟の利用である点が興味深い。これは,最初の事例が石灰岩中に開口している天然の洞窟を利用していた点とは対照的で,防寒に際してのニホンザルの柔軟な生態適応の一つと言える。今後,同様な事例を各地で収集することにより,行動面でのサルの寒冷地適応についての理解が深まると期待される。</p>

<p>In October 2015, large quantities of the feces from Japanese macaques (<i>Macaca fuscata</i>) were found within the gallery of the abandoned Nokado Mine in Nikko City, Tochigi Prefecture, central Japan. More than 100 feces specimens were concentrated in two narrow areas of 1-2 m<sup>2</sup> less than 8 m inward from the mine entrance. The feces were quite similar in outline and plural-connectivity by woody fibers to typical macaque winter feces. Analysis showed that the feces were almost entirely composed of plant-derived fibers. The locations and morphological characteristics of the feces support that the macaques used the gallery during winter, particularly from December 2014 to March 2015, and most likely huddled together for warmth. The amount of snowfall during the winter of 2014 was greater than average, likely forcing the macaques to use the abandoned gallery as a shelter from the heavy snow/wind. Although the Nokado Mine constitutes the second case of cave use by macaques in Japan, it is noteworthy that the macaques used an artificial cave excavated through mining. This is in contrast to the first report of cave use where macaques used a natural limestone cave in the karst regions. By accumulating cases of cave use by macaques, our understanding of adaptive traits in cold areas will be advanced.</p>

Journal

  • Primate Research

    Primate Research 34(1), 79-85, 2018

    Primate Society of Japan

Codes

  • NII Article ID (NAID)
    130007437809
  • NII NACSIS-CAT ID (NCID)
    AN10080557
  • Text Lang
    JPN
  • ISSN
    0912-4047
  • NDL Article ID
    029182806
  • NDL Call No.
    Z18-1898
  • Data Source
    NDL  J-STAGE 
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