Effects of fish introduction and eutrophication on the cladoceran community in Lake Fuxian,a deep oligotrophic lake in southwest China |
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| Authors: | Guimin Liu Zhengwen Liu Yanling Li Feizhou Chen Binhe Gu Joseph M Smoak |
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| Institution: | (1) National Key Laboratory of Lake Science & Environments, Nanjing Institute of Geography and Limnology, Chinese Academy of Science, 73 East Beijing Road, 210008 Nanjing, China;(2) Graduate School of Chinese Academy of Science, No. 19A Yuquan Road, 100049 Beijing, China;(3) Institute of Hydrobiology, Jinan University, Huang Pu Da Dao Xi 601, 510632 Guangzhou, China;(4) Department of Environmental Science, Policy, and Geography, University of South Florida, 140 7th Avenue South, Davis Hall 258, St. Petersburg, FL 33701, USA; |
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| 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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