Vertical and horizontal migrations by the jumbo squid Dosidicus gigas revealed by electronic tagging
Vertical and horizontal migrations by the jumbo squid Dosidicus gigas revealed by electronic tagging
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DOI：
10.3354/meps324001
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发表时间：
2006-01-01
影响因子：
2.5
通讯作者：
Salinas, C.
中科院分区：
文献类型：
--
作者：
Gilly, W. F.;Markaida, U.;Salinas, C.
太平洋柔鱼是一种巨大而强大的海洋鱿鱼，在东太平洋具有经济价值和生态重要性。我们采用电子标签的方法，提供了第一个长期监测的自然行为的D。生活在中远洋栖息地。七弹出卫星标签记录深度和温度共842小时，和传统的档案标签产生780小时的连续时间序列数据。水平运动近100公里，超过3天的观察，这些都是时间与既定的跨海湾迁移。鱿鱼一直在250米以上的深度度过大部分白天时间，这是被称为氧气最小层（OML）的中层缺氧区的近似上边界。一个昼夜迁移带来了鱿鱼近表面沃茨在黄昏，但一个高度可变的潜水量回到OML发生在整个晚上。有节奏的垂直运动内的OML经常发生，并在这个缺氧区300米以下的逗留长达6小时。实验室实验表明，在正常条件下，氧消耗的高休息率，但这一速率急剧下降，在缺氧条件下，如将与OML的性质。这些结果表明D. Gigas具有生理适应性，允许在含氧近表面沃茨和OML内不断觅食。
Dosidicus gigas is a large and powerful oceanic squid that is economically valuable and ecologically important in the eastern Pacific Ocean. We employed electronic tagging methods to provide the first long-term monitoring of the natural behaviors of D. gigas in its mesopelagic habitat. Seven pop-up satellite tags logged depth and temperature for a total of 842 h, and a conventional archival tag yielded 780 h of continuous time-series data. Horizontal movements of nearly 100 km over 3 d were observed, and these were temporally associated with an established trans-Gulf migration. Squid consistently spent most daylight hours at depths > 250 m, the approximate upper boundary of a midwater hypoxic zone termed the oxygen minimum layer (OML). A diel migration brought squid to near-surface waters at dusk, but a highly variable amount of diving back into the OML occurred throughout the night. Rhythmic vertical movements within the OML often occurred, and sojourns of up to 6 h in this hypoxic zone below 300 m were observed. Laboratory experiments revealed a high resting rate of oxygen consumption under normal conditions, but this rate decreased drastically under hypoxic conditions such as would be associated with the OML in nature. These findings suggest that D. gigas has physiological adaptations that permit constant foraging in both oxygenated near-surface waters and within the OML.