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Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River

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  • Wenxian Guo

    (School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

  • Ning He

    (School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

  • Gaofei Dou

    (School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

  • Jianwen Hu

    (School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

  • Hongxiang Wang

    (School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China)

Abstract

Water temperature, as one of the important water environment impact factors, has a significant impact on the survival and development of aquatic organisms. We selected water temperature data (1959–2017) from four key hydrological stations in the Yangtze River: Cuntan, Yichang, Hankou, and Datong. We analyzed the characteristics and variability of the Yangtze River hydrothermal regime by the Mann-Kendall method, wavelet analysis, and by the IHA-RVA method to analyze hydrothermal regime variations of the Yangtze River, and the response mechanisms of fish to variations in hydrothermal regimes were explored. The results show that (1) The annual average water temperature of the Yangtze River is warming, and Cuntan Station, Yichang Station, Hankou Station, and Datong Station have a sudden increase in temperature in 2002, 1995, 2003, and 2004, and the periodicity analysis demonstrates that Cuntan, Yichang, and Datong stations all have main periods of 24~32 years; (2) The overall variations of 32 hydrothermal indicators at Cuntan Station and Yichang Station reached 65% and 61%, which are close to the height variation; (3) With the construction of the Three Gorges Dam, the stagnant cooling effect caused the arrival date of the upper reproduction water temperature of “The four major fish species” to be delayed by about 23 days, and the stagnant heat effect caused the arrival date of the Chinese sturgeon reproduction upper limit water temperature to be delayed by about 30 days.

Suggested Citation

  • Wenxian Guo & Ning He & Gaofei Dou & Jianwen Hu & Hongxiang Wang, 2021. "Hydrothermal Regime Variation and Ecological Effects on Fish Reproduction in the Yangtze River," IJERPH, MDPI, vol. 18(22), pages 1-15, November.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:22:p:12039-:d:680599
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    References listed on IDEAS

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    1. Michelle Vliet & Fulco Ludwig & Pavel Kabat, 2013. "Global streamflow and thermal habitats of freshwater fishes under climate change," Climatic Change, Springer, vol. 121(4), pages 739-754, December.
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