Cumulative Ecological Impact of Cascade Hydropower Development on Fish Community Structure in the Main Stream of the Xijiang River, China.

Among these, the percentage indicators that showed an increasing trend included: special spawning mode fish (SPF), benthic egg fish (SIF), terminal-mouth fish (NFM), laterally compressed fish (LAF), stagnant water fish (HYF), pelagic egg fish (FLF), eurytopic fish (EUF), and drift egg fish (DRF).

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The percentage indicators that exhibited a decreasing trend were: planktivorous fish (PF), endemic fish (EF), and running water fish (CUF).

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Therefore, for indicators that at some sampling points have values lower than historical data, and at other points have values exceeding historical data, it can be considered that they are insensitive to environmental pressures, as the response of these indicators to environmental stress does not show a clear trend ( Figure 3 d).

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The results showed that 11 out of the 20 candidate indicators demonstrated highly significant discriminative ability between historical reference values and current monitoring values, each with an IQ score of 3 ( Figure 3 b).

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