Stable isotope records of sei whale baleens from Chilean Patagonia as archives for feeding and migration behavior
Stable isotope records of sei whale baleens from Chilean Patagonia as archives for feeding and migration behavior
复制标题
智利巴塔哥尼亚塞鲸须的稳定同位素记录作为进食和迁徙行为的档案
DOI：
10.1002/ece3.5939
复制
发表时间：
2019
影响因子：
2.6
通讯作者：
C. Mayr
中科院分区：
文献类型：
--
作者：
Lilian Reiss;V. Häussermann;C. Mayr
摘要：对智利巴塔哥尼亚大规模死亡事件后搁浅的塞鲸（Balaenoptera borealis）鲸须板中的碳（δ13C）和氮（δ15N）稳定同位素变化进行了研究，以评估潜在的饮食和迁徙模式。对来自六个个体的七个鲸须的碳和氮同位素比率进行了分析。 δ13C 值范围为 − 19.1 至 − 15.9‰，δ15N 值范围为 8.7 至 15.4‰。在一根鲸须内观察到 δ13C 的变化高达 2.9‰，δ15N 的变化高达 5.3‰。每个鲸须的碳和氮同位素记录显着相关，并显示出经小波分析证实的反复振荡。振荡的周期略有不同，表明鲸须生长速率在 10.0 至 16.5 厘米/年之间。根据潜在猎物类群的可用同位素数据和基于颗粒有机物的纬度同位素梯度的潜在迁徙行为，讨论了鲸鱼的食物来源。周期性可以用塞鲸从亚热带产卵区到高纬度觅食地的定期迁徙来解释。鲸须的 δ15N 记录在不同个体之间存在差异，最终表明塞鲸个体之间的摄食和迁徙偏好存在差异。
Abstract Carbon (δ13C) and nitrogen (δ15N) stable isotope variations in baleen plates of sei whales (Balaenoptera borealis) stranded after a mass mortality event in Chilean Patagonia were investigated to assess potential dietary and migratory patterns. Carbon and nitrogen isotope ratios of seven baleens from six individuals were analyzed. The δ13C values ranged from − 19.1 to − 15.9‰ and the δ15N values from 8.7 to 15.4‰. Variations of up to 2.9‰ for δ13C and 5.3‰ for δ15N were observed within one baleen. Carbon and nitrogen isotope records of each baleen were significantly correlated and showed recurring oscillations confirmed by wavelet analyses. Oscillations slightly differed in periodicity indicating variable baleen growth rates between 10.0 and 16.5 cm/year. Food sources of the whales are discussed in terms of available isotope data for potential prey taxa and potential migratory behavior on the basis of latitudinal isotope gradients of particulate organic matter. Cyclicity could be explained by regular migrations of the sei whales from subtropical calving areas to high‐latitude foraging grounds. δ15N records of baleens differed between individuals eventually pointing to diverse feeding and migratory preferences among sei whale individuals.