Top-down effects of bighead carp (Aristichthys nobilis) and Leptodora richardi (Haplopoda, Leptodoridae) in a subtropical reservoir during the winter-spring transition: a mesocosm experiment

文献类型： 外文期刊

第一作者： Zhao, Shuai-Ying

作者： Zhao, Shuai-Ying;Sun, Yu-Ping;Han, Bo-Ping

作者机构：

关键词： Tropical limnology;Daphnia;Filter-feeding fish;Leptodora richardi;Trophic cascade;Phytoplankton

期刊名称：HYDROBIOLOGIA （ 影响因子：2.694； 五年影响因子：2.781 ）

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年卷期：

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收录情况： SCI

摘要： To assess top-down effects of planktivorous fish and Leptodora in the freshwaters of southern China, a mesocosm experiment was conducted by manipulating bighead carp (Aristichthys nobilis) and Leptodora richardi within in situ enclosures installed in an oligo-mesotrophic reservoir. During the winter-spring transition, a low biomass (a parts per thousand 1 g wet weight m(-3)) of fish significantly reduced Daphnia biomass and zooplankton clearance rates and markedly increased the biomass of total phytoplankton, small phytoplankton (GALD < 30 mu m), and large phytoplankton (GALD a parts per thousand yen30 mu m). However, there was no significant effect of Leptodora and no interactive effect from fish and Leptodora on herbivorous zooplankton and phytoplankton. By contrast, exclusion of fish from the enclosures triggered the outbreak of Daphnia and thus resulted in higher zooplankton clearance rates. Algal biomass decreased to a low level in the absence of fish relative to in their presence, particularly during the last 10 days (mean biomass ratio, 1:7-1:36). Our results indicate that fish play a more important role in top-down effects than Leptodora. This study, together with previous research, suggests that fish may prey heavily on large-bodied herbivores, especially Daphnia, in southern China and reduce the chances for top-down control of phytoplankton.

分类号： Q17

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