Movements of pacific bluefin tuna (Thunnus orientalis) in the Eastern North Pacific revealed with archival tags
Movements of pacific bluefin tuna (Thunnus orientalis) in the Eastern North Pacific revealed with archival tags
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DOI：
10.1016/j.pocean.2010.04.015
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发表时间：
2010-07-01
影响因子：
4.1
通讯作者：
Block, Barbara A.
中科院分区：
文献类型：
--
作者：
Boustany, Andre M.;Matteson, Robyn;Block, Barbara A.
在这项研究中，253太平洋蓝鳍金枪鱼档案标记的加州，美国和下加利福尼亚，墨西哥海岸之间的2002年8月和2005年8月。157条鱼被重新捕获，获得并分析了143个数据集，产生了长达1203天的电子标签数据集。143条鱼的平均逍遥日为359 248（SD）天。根据基于光照的经度和基于SST的纬度估计，共计算出38，012个地理位置，使我们能够研究北美西海岸青少年蓝鳍金枪鱼的季节性运动。电子标记的蓝鳍金枪鱼显示出沿北美西海岸沿着可重复的季节性运动。蓝鳍金枪鱼在春季被发现在最南端，当时它们位于墨西哥下加利福尼亚南部，在秋季被发现在最北端，当时鱼类主要在加州中部和北方。鱼类呈纬向运动模式，与沿海上升引起的初级生产力的峰值。这些生产力峰值的位置的年际变化与标记鱼分布的相应运动有关。被标记的蓝鳍金枪鱼所占据的总体地理区域因初级生产力而异，鱼类更紧密地聚集在高生产力的区域，而更分散在低生产力的区域。从春季到秋季，蓝鳍金枪鱼位于加州当前生态系统中初级生产力水平最高的地区。然而，在冬季的几个月里，在一年中那个时候与沿海沿着其他地区相比生产力较低的地区发现了带标记的蓝鳍金枪鱼，这表明在冬季，蓝鳍金枪鱼以浮游红蟹、沙丁鱼和小龙虾的聚集体为食，这些鱼优先在沿海上升流减少的地区产卵。(C)2010爱思唯尔有限公司保留所有权利。
In this study, 253 Pacific bluefin tuna were archivally tagged off the coast of California, USA and Baja California, Mexico between August 2002 and August 2005. One hundred and fifty-seven fish were recaptured and 143 datasets were obtained and analyzed, yielding electronic tag datasets of up to 1203 days. Mean days at large for the 143 fish was 359 248 (SD) days. A total of 38,012 geolocations were calculated from light-based longitude and SST-based latitude estimates, allowing us to examine the seasonal movement of juvenile bluefin tuna off the west coast of North America. Electronic tagged bluefin tuna showed repeatable seasonal movements along the west coast of North America. Bluefin tuna were found farthest south in the spring when they were located off southern Baja California, Mexico and farthest north in the fall when fish were found predominately off central and northern California. Fish showed latitudinal movement patterns that were correlated with peaks in coastal upwelling-induced primary productivity. Interannual variation in the locality of these productivity peaks was linked with a corresponding movement in the distribution of tagged fish. Overall geographical area occupied by tagged bluefin varied with primary productivity, with fish being more tightly clustered in areas of high productivity and more dispersed in regions of low productivity. In the spring through fall, bluefin tuna were located in areas with the highest levels of primary productivity available in the California Current ecosystem. However, in the winter months, tagged bluefin tuna were found in areas with lower productivity compared to other regions along the coast at that time of year suggesting that during the winter, bluefin tuna are feeding on aggregations of pelagic red crabs, sardines and anchovies that preferentially spawn in areas of reduced coastal upwelling. (C) 2010 Elsevier Ltd. All rights reserved.