Otolith elemental and Sr isotopic composition as a natal tag for Biwa salmon Oncorhynchus masou subsp. in Lake Biwa, Japan
Otolith elemental and Sr isotopic composition as a natal tag for Biwa salmon Oncorhynchus masou subsp. in Lake Biwa, Japan
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DOI：
10.3354/ab00520
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发表时间：
2013-09
期刊：
影响因子：
1.4
通讯作者：
Y. Amano;Masayuki Kuwahara;Toshiro Takahashi;K. Shirai;K. Yamane;H. Amakawa;T. Otake
中科院分区：
文献类型：
--
作者：
Y. Amano;Masayuki Kuwahara;Toshiro Takahashi;K. Shirai;K. Yamane;H. Amakawa;T. Otake
本文研究了琵琶湖鲑虹鳟亚种耳石的元素和Sr同位素组成，是O. masou复合体在日本的琵琶湖水系，以评估耳石化学作为研究归巢和迁移历史的自然标签的有用性。从5条主要产卵河流和2个孵化场采集鱼类和水样。采用激光烧蚀电感耦合等离子体质谱和热电离质谱分别分析了样品的元素含量（Na/Ca、Mg/Ca、K/Ca、Mn/Ca、Sr/Ca和Ba/Ca）和Sr同位素比值（87 Sr/ 86 Sr）。在耳石和水样化学的显着变化进行了检测。我们还观察到显着的关系之间的Sr/Ca，Ba/Ca，和87 Sr/ 86 Sr比值的耳石和周围的水样品，从鱼被收集。其他元素的比例和所有元素的浓度在耳石显示独立的水化学的变化。采用二次判别函数分析的Jackknife交叉验证表明，耳石成分可按取样位置对琵琶湖鲑幼鱼进行分类，准确率较高（平均79%）。当Sr同位素比值与元素数据相结合时，平均准确度提高到89%。因此，这项研究表明，耳石化学确定鱼类分布的适用性。耳石化学成功地揭示了个体鱼类的纳塔尔（孵化）位置，促进了对洄游历史和栖息地利用的进一步了解，这对于为这一近危亚种建立有效的渔业管理策略至关重要。
We examined the elemental and Sr isotopic composition of otoliths from Biwa salmon Oncorhynchus masou subsp., an endemic subspecies of the O. masou complex in the Lake Biwa (Japan) water system, to evaluate the usefulness of otolith chemistry as a natural tag for studying homing and migration history. Fish and water samples were collected from 5 major spawning rivers and 2 hatcheries. The elemental content relative to calcium (Na/Ca, Mg/Ca, K/Ca, Mn/Ca, Sr/Ca, and Ba/Ca) and Sr isotopic ratio ( 87 Sr/ 86 Sr) of the samples were analyzed using laser abla- tion inductively coupled plasma mass spectrometry and thermal ionization mass spectrometry, respectively. Significant variations in otolith and water sample chemistry were detected. We also observed significant relationships between the Sr/Ca, Ba/Ca, and 87 Sr/ 86 Sr ratios of otoliths and those of ambient water samples from which the fish were collected. The other elemental ratios and all elemental concentrations in the otoliths showed variations independent of water chemistry. Jackknife cross-validation using quadratic discriminant function analysis showed that otolith ele- mental composition could classify Biwa salmon juveniles by sampling location, with a high level of accuracy (mean 79%). The mean accuracy increased to 89% when Sr isotopic ratios were com- bined with elemental data. This study thus demonstrated the suitability of otolith chemistry for determining fish distribution. Otolith chemistry successfully revealed the natal (hatching) loca- tions of individual fish, facilitating further understanding of migration history and habitat use, which are essential for establishing effective fishery management strategies for this Near Threat- ened subspecies.