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Will the Three Gorges Dam affect the underwater light climate of Vallisneria spiralis L. and food habitat of Siberian crane in Poyang Lake?

Abstract

Almost 95% of the entire population of the Siberian crane (Grus leucogeranus) winter in Poyang Lake, China, where they forage on the tubers of the submerged aquatic macrophyte Vallisneria spiralis. The Three Gorges Dam on the Yangtze River may possibly affect this food source of the Siberian crane by affecting the light intensity reaching the top of the V. spiralis canopy. In this study, the photosynthetically active radiation at the top of the V. spiralis canopy (PARtc) in Lake Dahuchi was modeled from 1998 to 2006, and the potential impacts of changes in water level and turbidity on the underwater light climate of V. spiralis were analyzed. PARtc was calculated from incident irradiance while the losses due to reflection at the water surface, absorption, and scattering within the water column were taken into consideration. The results indicated significant differences in PARtc between years. Six years of water level and Secchi disk depth records revealed a seasonal switching of the lake from a turbid state at low water levels in autumn, winter, and spring to a clear state at high water levels during the monsoon in summer. The highest PARtc occurred at intermediate water levels, which were reached when the Yangtze River forces Lake Dahuchi out of its turbid state in early summer and the water becomes clear. The intended operation of the Three Gorges Dam, which will increase water levels in May and June, may advance the moment when Lake Dahuchi switches from turbid to clear. We suggest that this might increase production of V. spiralis and possibly improve the food habitat conditions for wintering Siberian crane in Poyang Lake.

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Notes

  1. All elevations and water levels refer to the Chinese National Vertical Datum of 1985.

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Acknowledgments

This study was supported by Netherlands Foundation for the Advancement of Tropical Research (WOTRO) (Grant: WB 84-550), the International Institute for Geo-information Science and Earth Observation (ITC), the Netherlands, the School of Resource and Environmental Science, Wuhan University, China, the Bureau of Jiangxi Poyang Lake National Nature Reserve, China, and the International Crane Foundation (ICF).

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Correspondence to Guofeng Wu.

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Handling editor: Luigi Naselli-Flores

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Wu, G., de Leeuw, J., Skidmore, A.K. et al. Will the Three Gorges Dam affect the underwater light climate of Vallisneria spiralis L. and food habitat of Siberian crane in Poyang Lake?. Hydrobiologia 623, 213–222 (2009). https://doi.org/10.1007/s10750-008-9659-7

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  • DOI: https://doi.org/10.1007/s10750-008-9659-7

Keywords

  • Photosynthetically active radiation (PAR)
  • Vallisneria spiralis
  • Tuber production
  • Siberian crane
  • Poyang Lake
  • Three Gorges Dam