Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates
Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates
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利用鲸须板的碳和氮稳定同位素分析估计怀孕的南极小须鲸（Balaenoptera bonaerensis）的摄食记录
DOI：
10.1007/s00300-021-02816-5
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发表时间：
2021
期刊：
影响因子：
1.7
通讯作者：
Y. Mitani
中科院分区：
文献类型：
--
作者：
Mayuka U.;I. Suzuki;K. Ito;M. Ishizuka;Y. Ikenaka;S. M. M. Nakayama;T. Tamura;K. Konishi;T. Bando;Y. Mitani
南极小须鲸（Balaenoptera bonaerensis）是一种迁徙性的繁殖动物，夏季在南大洋密集进食南极磷虾（Euphausia superba），冬季在低纬度繁殖，但它们在南极以外的猎物是未知的。对10头妊娠南极小须鲸鲸须板的δ 13 C和δ 15 N进行了稳定同位素分析，以了解低纬度地区小须鲸鲸须板的生长速度和食物组成。δ 15 N沿鲸须板边缘沿着长度方向有2 ~ 3次振荡，年增长率为75.2 ± 20.4 mm，振幅较小（0.97 ± 0.21 ‰）。贝叶斯稳定同位素混合模型被用来了解占主导地位的猎物，对鲸须板的同位素组成作出贡献，使用南极磷虾的胃内容物和南极沿海磷虾（Euphausia crystallorophias），南极银鱼（Pleuragramma anaparticum），澳大利亚磷虾，和澳大利亚中上层鱼类。模型表明，鲸须盘底部最近3次记录（模型1）和每个鲸须盘中δ 15 N值最高的记录（模型2）的食物组成主要是南极磷虾，贡献率约为80%。在两种模型中，南极沿海磷虾的比率约为10%，而两个澳大利亚猎物群体的比率不到2.0%。这些结果表明，怀孕的南极小须鲸在南极以外没有捕食足够的猎物，无法改变其鲸须板中的稳定同位素值。
Antarctic minke whales (Balaenoptera bonaerensis) are migratory capital breeders that experience intensive summer feeding on Antarctic krill (Euphausia superba) in the Southern Ocean and winter breeding at lower latitudes, but their prey outside of the Antarctic is unknown. Stable isotope analyses were conducted on δ13C and δ15N from the baleen plates of ten pregnant Antarctic minke whales to understand the growth rate of the baleen plate and their diet in lower latitudes. Two to three oscillations along the length of the edge of the baleen plate were observed in δ15N, and the annual growth rate was estimated to be 75.2 ± 20.4 mm, with a small amplitude (0.97 ± 0.21 ‰). Bayesian stable isotope mixing models were used to understand the dominant prey that contributed to the isotopic component of the baleen plate using Antarctic krill from the stomach contents and reported values of Antarctic coastal krill (Euphausia crystallorophias), Antarctic silver fish (Pleuragramma antarcticum), Australian krill spp., and Australian pelagic fish spp.. The models showed that the diet composition of the most recent three records from the base of the baleen plates (model 1) and the highest δ15N values in each baleen plate (model 2) were predominantly Antarctic krill, with a contribution rate of approximately 80%. The rates were approximately 10% for Antarctic coastal krill and less than 2.0% for the two Australian prey groups in both models. These results suggest that pregnant Antarctic minke whales did not feed on enough prey outside of the Antarctic to change the stable isotope values in their baleen plates.
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