From the changing trend of Sr:Ca values, upper reaches U1 and U2 had an increasing trend after the 300th scanning point, while U3, M3, L1 and L3 had a decreasing trend ( Figure 4 a).
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Strontium and Magnesium in Otoliths Can Trace <i>Schizothorax grahami</i> (Regan, 1904) Life History.
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