Ecological Research

, Volume 26, Issue 3, pp 615–626 | Cite as

Cascading effects of larval Crucian carp introduction on phytoplankton and microbial communities in a paddy field: top-down and bottom-up controls

  • Yoko Nishimura
  • Taisuke Ohtsuka
  • Kohei Yoshiyama
  • Daisuke Nakai
  • Fujiyoshi Shibahara
  • Masayoshi Maehata
Original Article

Abstract

Effects of fish predation propagate through aquatic food webs, where the classical grazing food chain and microbial loop are interwoven by trophic interactions. The overall impact on aquatic food webs is further complicated because fish may also exert bottom-up controls through nutrient regeneration. Yet, we still have limited information about cascading effects among fish, zooplankton, phytoplankton, and microbes. In this study, we performed a mesocosm experiment to evaluate effects of fish introduction on plankton communities. Six plots were set in factorial combination with fish introduction and rice straw plowing in a paddy field, and the experiment was continued for 4 weeks. Introduction of fish significantly increased chlorophyll a concentrations in smaller size fractions (<15 μm) and abundances of filamentous bacteria (>5 μm in length) and heterotrophic nanoflagellates in 3–15 μm fraction. Microbes in 0.8–3 μm fraction showed increasing but not significant trends in response to fish introduction. These results indicate cascading effects of fish predation operating via two pathways, one through grazing food chain and the other through microbial food web. Phytoplankton community compositions shifted in similar fashion in all plots until 1 week after fish introduction, and then diverged between plots with and without fish thereafter. Bottom-up effects of fish introduction were suggested by increases of total chlorophyll a and inedible phytoplankton species in response to fish introduction. This study provides an example of how fish predation regulates biomass and structure of phytoplankton and microbial communities.

Keywords

Trophic cascades Food chain Microbial loop HNF Filamentous bacteria 

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Copyright information

© The Ecological Society of Japan 2011

Authors and Affiliations

  • Yoko Nishimura
    • 1
  • Taisuke Ohtsuka
    • 2
  • Kohei Yoshiyama
    • 3
  • Daisuke Nakai
    • 2
  • Fujiyoshi Shibahara
    • 4
  • Masayoshi Maehata
    • 2
  1. 1.Port and Airport Research InstituteYokosukaJapan
  2. 2.Lake Biwa MuseumKusatsuJapan
  3. 3.Atmosphere and Ocean Research InstituteThe University of TokyoKashiwaJapan
  4. 4.Agricultural Technology Promotion Center of Shiga PrefectureOmihachimanJapan

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