Abstract
Fish introduction and eutrophication are important disturbances to aquatic ecosystems, especially to oligotrophic plateau lakes that are generally considered to be very vulnerable ecosystems. Planktivorous fish Neosalanx taihuensis were introduced to Lake Fuxian, an oligotrophic (TP 17 μg/l) deep (average depth 89.7 m) plateau lake in southwest China, in the middle of the 1980s. After the introduction, N. taihuensis became the dominant fish species, and the total fish yield increased about threefold. Although the lake is still oligotrophic, the trophic state of Lake Fuxian has started to shift with increasing nutrient supply (eutrophication) due to an increase in human activities in the drainage basin. This study investigated the effects of N. taihuensis introduction and eutrophication on the cladoceran community of Lake Fuxian by examining changes in cladoceran assemblages and abundance, as well as the morphological features of Bosmina microfossils in the lake sediment. Absolute abundance of total Bosmina increased substantially after the middle of the 1980s. In addition, dominance of Bosmina with straight antennules was replaced by Bosmina with hooked antennules. The morphological variables (length of carapace, antennule and mucro) of Bosmina all decreased when planktivorous fish N. taihuensis achieved relatively large numbers. Eutrophication was the most important process determining cladoceran abundance, while fish introduction played an important role in structuring the cladoceran community in this oligotrophic, deep plateau lake.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (40371103, 40602039 and 40772204). The authors give their thanks to Xiangdong Yang and Rong Wang for their help with software and data analysis. Thanks to Jinglu Wu for his valuable suggestions and providing recent references. We are grateful to Weilan Xia and Guirong Sui for sediment analyses. Special thanks are due to Jianhui Qin for providing his unpublished manuscript.
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Liu, G., Liu, Z., Li, Y. et al. Effects of fish introduction and eutrophication on the cladoceran community in Lake Fuxian, a deep oligotrophic lake in southwest China. J Paleolimnol 42, 427–435 (2009). https://doi.org/10.1007/s10933-008-9286-3
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DOI: https://doi.org/10.1007/s10933-008-9286-3