論文

査読有り
2017年2月

Distribution and Local Movement of Humpback Whales in Okinawan Waters Depend on Sex and Reproductive Status

ZOOLOGICAL SCIENCE
  • Nozomi Kobayashi
  • ,
  • Haruna Okabe
  • ,
  • Isao Kawazu
  • ,
  • Naoto Higashi
  • ,
  • Keisuke Kato
  • ,
  • Hirokazu Miyahara
  • ,
  • Gen Nakamura
  • ,
  • Hidehiro Kato
  • ,
  • Senzo Uchida

34
1
開始ページ
58
終了ページ
63
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.2108/zs160012
出版者・発行元
ZOOLOGICAL SOC JAPAN

The distribution and local movement patterns of humpback whales in waters off the west coast of Okinawa Island, southwest Japan, were investigated using line transect and photo-identification methodologies. Line transect surveys were conducted from 2011 to 2014 and photo-identification survey from 2006 to 2012. During the surveys, humpback whales aggregated in the areas around Ie and Kerama Islands, and tended to travel along the inshore coast of Okinawa Island when they move locally between those two sites. A total of 496 humpback whales of the known sex were photo-identified (322 males, 75 females and 99 females with a calf). Of these, 24.8% were confirmed moving locally between the sites of Ie and Kerama Islands within the same season. Frequency rates of the local movement for males, females and females with a calf were 41.9, 25.0, and 15.1%, respectively; the frequency of local movement for males was significantly higher than that for females and females with a calf. These results indicate that male humpback whales tend to move more actively between the local breeding sites as compared to females and females with a calf. We speculate that the males search for more opportunities to mate, whereas females with a calf tend to remain in the same areas to nurse their calves. These findings extend our knowledge of the habitat use and reproductive ecology of humpback whales in Okinawan waters, which remain poorly understood.

Web of Science ® 被引用回数 : 1

リンク情報
DOI
https://doi.org/10.2108/zs160012
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000395121300009&DestApp=WOS_CPL