Foraging ecology of Mediterranean fin whales in a changing environment elucidated by satellite tracking and baleen plate stable isotopes
Foraging ecology of Mediterranean fin whales in a changing environment elucidated by satellite tracking and baleen plate stable isotopes
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DOI：
10.3354/meps09269
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发表时间：
2011-01-01
影响因子：
2.5
通讯作者：
Guinet, C.
中科院分区：
文献类型：
--
作者：
Bentaleb, I.;Martin, C.;Guinet, C.
我们调查了地中海西部长须鲸的饮食和分布的季节性变化。为了这个目的，我们结合碳和氮的稳定同位素比（三角洲C-13，三角洲N-15）沿着10须鲸板收集搁浅长须鲸在1975年和2002年之间的卫星标签部署在2003年夏天的11头长须鲸。鲸须板的稳定同位素进行了比较的磷虾Meganyctiphanesnorvegica，在地中海西北部的长须鲸的主要猎物。在西班牙马拉加附近采集的两个样品板显示出较大的C-13变化，而在其他8个样品板中只能检测到较小的变化。虽然所有平均鲸须板结果均与地中海M的Delta C-13特征一致。norvegica，最贫化三角洲C-13值之间的大西洋和地中海M。norvegica，这表明向西迁徙可能延伸到直布罗陀海峡，但不是广泛的，长期的喂养在东北大西洋。卫星追踪证实了这一模式;我们成功追踪的8头长须鲸中有1头离开地中海前往大西洋。鲸须板的同位素特征的长期变化表现出显着的耗竭趋势，表明由于营养物质和人为碳的增加输入的变化正在发生在西地中海生态系统。
We investigated seasonal shifts in diet and distribution of fin whales Balaenoptera physalus occurring in the western Mediterranean Sea. For this purpose, we combined carbon and nitrogen stable isotope ratios (delta C-13, delta N-15) along 10 baleen plates collected from stranded fin whales between 1975 and 2002 with satellite tag deployments on 11 fin whales during summer 2003. Baleen plate stable isotopes were compared with those of the krill Meganyctiphanes norvegica, the main prey of fin whales in the northwestern Mediterranean Sea. Two plates collected near Malaga, Spain, exhibited larger delta C-13 variations, while only smaller variations could be detected in the other 8. While all mean baleen plate results were consistent with the delta C-13 signature of Mediterranean M. norvegica, the most depleted delta C-13 values were intermediate between those of Atlantic and Mediterranean M. norvegica, suggesting westward migrations perhaps extending to the Strait of Gibraltar but not extensive, prolonged feeding in the Northeast Atlantic. This pattern was confirmed by satellite tracking; 1 out of 8 fin whales we successfully tracked left the Mediterranean for the Atlantic. Longer-term changes in isotopic signatures of baleen plates exhibited significant depletion trends, indicating that changes due to increasing input of nutrients and anthropogenic carbon are occurring in the western Mediterranean Sea ecosystem.