@article{oai:nodai.repo.nii.ac.jp:00000360,
 author = {高中, 健一郎 and 安藤 元一 and 天野 卓 and 小川 博 and TAKANAKA, Ken-ichirou and ANDO Motokazu and AMANO Takashi and OGAWA Hiroshi},
 issue = {1},
 month = {2016-04-20},
 note = {本研究は,アカネズミApodemus speciosusの側溝への落下時期と繁殖期との関連性を調べることを目的とし,アカネズミの雄の精巣サイズと血漿テストステロン濃度を測定し,繁殖期を調べた。実験に用いたアカネズミの成獣雄は延べ35個体であり,静岡県富士宮市において,2003年12月から2004年11月までに捕獲した。精巣長径の周年変化をみると,2月から9月までの一山型を示し,その期間中の大きさは12mm以上であった。一方,精巣重量および血漿テストステロン濃度の周年変化をみると,共に4月と8月にピークを持つ二山型を示し,血漿テストステロン濃度の値は6月に非繁殖期と同様の低い値まで低下した。アカネズミの雄は,精巣の大きさから性的に活発であると判断された場合でも,内分泌学的には不活発な状態の場合があることが明らかになった。さらに,精巣長径より精巣重量の方がテストステロンとの相関が高いことが認められ,アカネズミの雄の繁殖状態を判断するためには,精巣長径より精巣重量を指標に用いた方が適当であることがわかった。これらのことから,側溝への落下時期は繁殖期の活動と関連していると考えられた。, Mean testicular size and plasma testosterone concentration in matured male the Large Japanese Field Mouse, Apodemus speciosus, were measured in an effort to determine if a relationship exists between the breeding season and what has been termed the falling season into roadside gutter. The mice were captured from December 2003 to November 2004 in Fujinomiya, Shizuoka, Japan. In total, thirty-five matured male mice were studied. The mean value of testicular length was the high level from February to September. During these months the testicular length was more than 12mm. In contrast the mean testicular weight and plasma testosterone concentration peaked in April and August. The mean plasma testosterone concentration decreased to basal levels in June. The breeding season of the Large Japanese Field Mouse is considered to occur twice in the spring and autumn in the area under study. Despite the fact that the male Large Japanese Field Mouse was observed to be in a condition assumed to be morphologically agreeable to reproductive activity, it was clear that the mouse was not in an endocrinologically reproductive state. In addition, our data indicated that testicular weight correlated better with testosterone levels than did testicular length. We consider testicular weight could be a better indicator of reproductive activity than testicular length. Therefore, we considered that the falling season into side gutter was related to the breeding season activity., E, 3, KJ00005353861, 論文, Article},
 pages = {15--19},
 title = {アカネズミApodemus speciosusの側溝への落下時期と繁殖期との関連性},
 volume = {54},
 year = {},
 yomi = {タカナカ, ケンイチロウ and アンドウ, モトカズ and アマノ, タカシ and オガワ, ヒロシ}
}