DSpace 大学logo  
 

CLOVER-酪農学園大学学術研究コレクション >
2:大学院 >
1.酪農学研究科 >
学位論文(修士) >

このアイテムのファイル:

ファイル 記述 サイズフォーマット
Shichijo_syuuron.pdf5.43 MBAdobe PDF見る/開く
タイトル: エゾシカの枝角の発達と成長 : 低質・高質個体群間の比較について
その他のタイトル: Development and growth of Hokkaido sika deer antlers : A comparison between low and high-quality populations
著者: 七條, 知哉
Shichijo, Tomoya
発行日: 12-May-2017
抄録: I clarified a density dependence effect to growth of antler of sika deer in a low-quality population by food limitation with high population density in Nakanoshima Island in Lake Toya, Hokkaido, Japan, comparing to a high-quality population in Nishiokoppe, Hokkaido. The antler width in Phase 1 (1956-83, P1) of the Toya population was significantly larger than that in Phase 2 (1984-2003, P2) and Phase 3 (2004-, P3). The straight length of main beam in P1 was significantly larger than that in P3. The circumference of coronet in P1 was significantly larger than that in P3. The length along main beam of the Nishiokoppe population (control or Ctl) was significantly larger than that in P1, P2 and P3. The CTS (CIC trophy score) in P1 was significantly higher than that in P3. The length along main beam in Nakanoshima was affected by population density first. And then, the antler width reduced after the first mass mortality and kept small after the second mass mortality. The straight length of main beam was affected by population density following the circumference of coronet. These results suggested that population density affected antler growth in the order of length itself, width, circumference, and straight length. The growth curves of measurements of Ctl reached plateau (up to 7- 8 years old) faster with larger values than those of P1, 2, and 3. While the age when reaching plateau of antler growth in P1 was younger than that in P2 and the antler sizes in plateau in P1 were larger than those of P2, the recovery was detected in P3, suggesting that food availability per individual increased since the population decreased after mass mortalities.
URI: http://hdl.handle.net/10659/4907
学位授与年月日: 2016
学位名: 酪農学
学位授与機関: 酪農学園大学
出現コレクション:学位論文(修士)

このリポジトリに保管されているアイテムは、他に指定されている場合を除き、著作権により保護されています。

このアイテムの引用には次の識別子を使用してください: http://hdl.handle.net/10659/4907

 

Copyright © 2008 Rakuno Gakuen University