Migratory history of the threespine stickleback Gasterosteus aculeatus
Migratory history of the threespine stickleback Gasterosteus aculeatus
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DOI：
10.1007/s102280300001
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发表时间：
2003-02-25
影响因子：
1.2
通讯作者：
Miyazaki, N
中科院分区：
文献类型：
--
作者：
Arai, T;Goto, A;Miyazaki, N
通过在电子显微探针上使用波长色散 X 射线光谱仪检测其耳石中的锶 (Sr) 和钙 (Ca) 浓度，研究了从日本咸水（海水）和淡水中采集的三刺刺鱼 Gasterosteus aculeatus 的两种高度分化类型（日本海和太平洋类型）的迁徙历史。耳石中的 Sr:Ca 比率随栖息地的盐度而变化。太平洋淡水居民型样本的耳石Sr:Ca比率显示出持续较低的Sr:Ca比率，从核心到边缘平均为0.85-0.96 x 10(-3)。相比之下，日本海和太平洋类型的溯河产卵类型的耳石Sr:Ca比率根据其从海水到淡水的迁移模式沿着生活史横断面剧烈波动。溯河产卵类型的较高比率，平均为5.4 x 10(-3)，在从核心到200μm的耳石区域，对应于航海时期，表明耳石Sr:Ca比率受到环境水盐度的影响。这些发现清楚地表明，耳石 Sr:Ca 比率反映了个体的生活史，并且这两种高度分化的刺鱼具有灵活的迁徙策略。
The migratory history of two highly divergent forms (the Japan Sea and Pacific Ocean forms) of the threespine stickleback Gasterosteus aculeatus collected from Japanese brackish water (seawater) and freshwater was studied by examining strontium (Sr) and calcium (Ca) concentrations in their otoliths using wavelength dispersive X-ray spectrometry on an electron microprobe. The Sr:Ca ratios in the otoliths changed with salinity of the habitat. The otolith Sr:Ca ratios of the freshwater resident-type samples of the Pacific Ocean form showed consistently low Sr:Ca ratios, averaging 0.85-0.96 x 10(-3) from the core to the edge. In contrast, the otolith Sr:Ca ratios of the anadromous type of both the Japan Sea and Pacific Ocean forms fluctuated strongly along the life history transects in accordance with their migration patterns from seawater to freshwater. The higher ratios in the anadromous type, averaging 5.4 x 10(-3), in the otolith region from the core to 200 mum, corresponded to the seagoing period, suggesting that otolith Sr:Ca ratios are affected by ambient water salinity. These findings clearly indicate that otolith Sr:Ca ratios reflect individual life histories, and that these two highly divergent forms of stickleback have a flexible migration strategy.