Top-down effects of bighead carp (Aristichthys nobilis)and Leptodora richardi (Haplopoda, Leptodoridae)in a subtropical reservoir during the winter–springtransition: a mesocosm experiment
Top-down effects of bighead carp (Aristichthys nobilis)and Leptodora richardi (Haplopoda, Leptodoridae)in a subtropical reservoir during the winter–springtransition: a mesocosm experiment
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亚热带水库冬春过渡期间鳙鱼 (Aristichthys nobilis) 和 Leptodora richardi (Haplopoda, Leptodoridae) 自上而下的影响：中生态实验
DOI：
10.1007/s10750-015-2398-7
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发表时间：
2016
期刊：
影响因子：
2.6
通讯作者：
Han Bo-Ping
中科院分区：
文献类型：
--
作者：
Zhao Shuai-Ying;Sun Yu-Ping;Han Bo-Ping
为了评估中国南方淡水中食浮游生物和细纹鱼的自上而下的影响，通过在寡中营养水库安装的原位围栏内操纵鳙鱼（Aristichthys nobilis）和细纹藻进行了中生态实验。冬春过渡期间，鱼类的低生物量（约1 g湿重m−3）显着降低了蚤生物量和浮游动物的清除率，并显着增加了总浮游植物、小型浮游植物（GALD<30μm）和大型浮游植物（GALD≥30μm）的生物量。但细线虫对草食性浮游动物和浮游植物的影响不显着，鱼类与细线虫没有交互作用。相比之下，将鱼类排除在围栏之外会引发水蚤的爆发，从而导致浮游动物的清除率更高。相对于有鱼存在的情况，藻类生物量在没有鱼的情况下下降到较低水平，特别是在过去 10 天内（平均生物量比率，1:7–1:36）。我们的结果表明，鱼类在自上而下的效应中比细线鱼发挥着更重要的作用。这项研究与之前的研究一起表明，鱼类可能大量捕食中国南方的大型食草动物，尤其是水蚤，从而减少了对浮游植物进行自上而下控制的机会。
To assess top-down effects of planktivorous fish andLeptodorain the freshwaters of southern China, a mesocosm experiment was conducted by manipulating bighead carp (Aristichthys nobilis) andLeptodora richardiwithin in situ enclosures installed in an oligo-mesotrophic reservoir. During the winter–spring transition, a low biomass (≈1 g wet weight m−3) of fish significantly reducedDaphniabiomass and zooplankton clearance rates and markedly increased the biomass of total phytoplankton, small phytoplankton (GALD <30 μm), and large phytoplankton (GALD ≥30 μm). However, there was no significant effect ofLeptodoraand no interactive effect from fish andLeptodoraon herbivorous zooplankton and phytoplankton. By contrast, exclusion of fish from the enclosures triggered the outbreak ofDaphniaand 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 thanLeptodora. This study, together with previous research, suggests that fish may prey heavily on large-bodied herbivores, especiallyDaphnia, in southern China and reduce the chances for top-down control of phytoplankton.