@article{oai:ir.kagoshima-u.ac.jp:00010427,
 author = {中西, 良孝 and 藤橋, 大輔 and 萬田, 正治},
 journal = {南太平洋海域調査研究報告=Occasional papers},
 month = {2016-10-28},
 note = {稀少動物遺伝資源としての口之島野生化牛（以下，野生化牛）を適切に保護するための基礎的知見を得る目的で，２００１年における野生化牛の生息頭数を推定するとともに，生息環境を明らかにした．８月と１１月に確認した重複のない野生化牛の個体数は３２頭であった．また，８月には黒毛，黒毛白斑，褐毛および褐毛白斑の４つの毛色タイプが認められたが，１１月には褐毛の個体が見られなかった．野生化牛の群は少なくとも５つ存在し，群のサイズは３～１２頭であった．８月に採取したマダニはすべてキチマダニ（Haemaphysalis flava）であったが，１１月にはキチマダニとフタトゲチマダニ（Haemaphysalis longicornis）が地点によって個体数に多少の差があるものの，ほぼ同じ割合で採取された．また，マダニ個体数は１１月よりも８月で多かった．生息地内にはセランマ温泉の源泉以外，２ヵ所の水場を確認した．
以上から，２００１年における野生化牛の生息確認頭数は１９９９年までの頭数よりも減少しており，これには夏季高温寡雨における水場の枯渇，道路のコンクリート舗装に伴う飼料資源（路肩草）の減少，外部および内部寄生虫による感染症の蔓延などが影響しているものと推察された．, A survey was conducted to investigate the population and group size of Kuchinoshima feral cattle and their environment in 2001 from the viewpoint of the conservation of rare and endangered animal genetic resources. A total of 32 cattle including adults, the young and suckling calves were found in the southeastern area of the island between August and November, 2001. There were 13 cattle with 4 types of coat color, i.e. black, black and white, brown, and brown and white in August, whereas there was no brown animals in November. The cattle formed 5 groups at least comprising 3-12 individuals. All the ticks collected by dragging a flannel cloth (0.7 × 1 m) on the pasture were identified as unfed larvae of Haemaphysalis flava in August, while Haemaphysalis flava and Haemaphysalis longicornis were almost equally found in November. In addition, the tick population in August was larger than that in November. Two watering places besides the one at Seramma hot spring were found in the habitat. In conclusion, the number of Kuchinoshima feral cattle has been decreased since 1999, which may be influenced by a scarcity of watering places, a decrease in the amount of herbage available caused by extension of a paved road and/or infection of external and internal parasites., SECTION THREE: PEOPLE-NATURE INTERACTIONS: Report 4},
 pages = {97--103},
 title = {鹿児島県トカラ列島における在来家畜の意義 : 口之島野生化牛保護のための生息調査},
 volume = {38},
 year = {}
}