Diving behavior and performance of harbor porpoises, Phocoena phocoena, in Funka Bay, Hokkaido, Japan

被引:38
|
作者
Otani, S
Naito, Y
Kawamura, A
Kawasaki, M
Nishiwaki, S
Kato, A
机构
[1] Grad Univ Adv Studies, Dept Polar Sci, Tokyo 173, Japan
[2] Natl Inst Polar Res, Tokyo 173, Japan
[3] Mie Univ, Fac Bioresources, Dept Bioresources, Tsu, Mie 514, Japan
[4] Inst Cetacean Res, Chuo Ku, Tokyo 104, Japan
关键词
harbor porpoise; Phocoena phocoena; diving behavior; micro-datalogger; Japan;
D O I
10.1111/j.1748-7692.1998.tb00711.x
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
In order to monitor the diving behavior of free-ranging cetaceans, micro-dataloggers, with pre-programmed release mechanisms, were attached to the dorsal fins of two female harbor porpoises (Phocoena phocoena) in Funka Bay, Hokkaido, Japan, in 1994. The two loggers were successfully recovered and a total of 141 h of diving data (depth and water temperature in 4,671 dives) was obtained. Both porpoises dived almost continuously, rarely exhibiting long-term rest at the surface. Maximum dive depths were 98.6 m and 70.8 m, respectively, with more than 70% of diving time at 20 m or less. Most shallow dives were V-shaped with no bottom time. The V-shaped dives were significantly shallower in dive depth and shorter in dive duration than U-shaped dives. Descent rate was not constant during a dive. The deeper the dive depths, the faster the mean descent and initial descent rates. This suggests that porpoises have anticipated the depth to which they will dive before initiating the dive itself.
引用
收藏
页码:209 / 220
页数:12
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