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Preliminary investigation on otolith microchemistry of naked carp (Gymnocypris przewalskii) in Lake Qinghai, China

文献类型： 外文期刊

作者： Liu, Hongbo 1 ; Jiang, Tao 2 ; Tan, Xichang 3 ; Yang, Jian 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Ecol Environm & Resources Inland Fisherie, Wuxi 214081, Peoples R China

2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China

3.Chinese Acad Fishery Sci, Pearl River Fishery Res Inst, Guangzhou 510380, Guangdong, Peoples R China

关键词： Electron probe microanalysis;Strontium;Calcium;Magnesium;Migration

期刊名称：ENVIRONMENTAL BIOLOGY OF FISHES （ 影响因子：1.844； 五年影响因子：1.839 ）

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收录情况： SCI

摘要： The paper represents the first otolith study on trace element (Sr, Mg) concentrations of naked carp (Gymnocypris przewalskii), an endemic and endangered migratory species in high-altitude Lake Qinghai and its tributaries of China, using electron probe microanalysis (EPMA). Results from life-history transect analyses and X-ray intensity maps suggested that the general reference criterion for discrimination of the salinity habitats of freshwater, brackish and seawater by the otolith Sr:Ca ratio of diadromous fish cannot be used as a reliable indicator for reconstructing the migration history of naked carp between different habitats. On the contrary, Mg concentrations and Mg:Ca ratios were found inconsistent in all otolith samples of G. przewalskii. The otolith regions with higher Mg concentrations (greenish) might coincide with the period that yolk provides nutrition to G. przewalskii. The lower Mg:Ca ratios in most regions of otolith showed that Mg in G. przewalskii might be regulated to that low level during its lifespan in Lake Qinghai. This suggests that the distinct EPMA approach can provide new visualization insight into the ontogenetic and migration patterns of G. przewalskii.

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