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首页> 外文期刊>Marine ecology progress series >Foraging tactics of Baikal seals differ between day and night
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Foraging tactics of Baikal seals differ between day and night

机译：贝加尔湖海豹的觅食策略昼夜不同

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摘要

Some pinniped species appear to forage during both daylight and darkness. To determine any differences in the foraging tactics between day and night, we attached data loggers with a newly developed time-scheduled release system to 2 free-ranging female Baikal seals Phoca sibirica. The system released the loggers from the seals 24 h after deployment, and allowed us to retrieve the loggers via VHF radio signals. We obtained the first time-series diving data on Baikal seals. The seals dived almost continuously, to an average of 68.9 m, with dives deeper than this ( > 150 m) being concentrated around dusk and dawn. They showed distinctly different diving patterns between day and night in terms of swimming speed profile and the sequential pattern in maximum dive depth . In the daytime, dives were characterized by higher swimming speeds (mean 1.2 m s~(-1)) and upward-directed acceleration events. At night, dives were shallower around midnight and characterized by lower speeds (mean 0.9 m s~(-1)) and undirectional deceleration events. We suggest that these differences reflect predation on pelagic fishes by seals using visual cues during the day and predation on swarming crustaceans by seals using tactile cues at night.
机译：在白天和黑夜中，一些针刺物种似乎都在觅食。为了确定白天和晚上之间觅食策略的任何差异，我们将数据采集器和新开发的定时释放系统连接到2个自由放养的雌性贝加尔海豹海豹（Phoca sibirica）。部署后24小时，系统从封条上释放了记录仪，并允许我们通过VHF无线电信号检索记录仪。我们获得了贝加尔湖海豹的第一个时间序列潜水数据。海豹几乎连续潜水，平均为68​​.9 m，比该深度更深的潜水（> 150 m）集中在黄昏和黎明。在游泳速度曲线和最大潜水深度的顺序模式方面，他们在白天和夜间表现出明显不同的潜水模式。在白天，潜水的特征是较高的游泳速度（平均1.2 m s〜（-1））和向上指向的加速事件。在晚上，潜水在午夜前后较浅，并且具有较低的速度（平均0.9 m s〜（-1））和无方向性减速事件。我们认为，这些差异反映了白天使用视觉线索对海豹鱼类的捕食，而夜间则使用触觉线索对海豹养殖的甲壳类动物的捕食。

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