Hydrobiologia

, Volume 159, Issue 3, pp 247–258

Effects of permethrin on phytoplankton and zooplankton in an enclosure ecosystem in a pond

  • Masayuki Yasuno
  • Takayuki Hanazato
  • Toshio Iwakuma
  • Kenzi Takamura
  • Ryuhei Ueno
  • Noriko Takamura
Article

DOI: 10.1007/BF00008238

Cite this article as:
Yasuno, M., Hanazato, T., Iwakuma, T. et al. Hydrobiologia (1988) 159: 247. doi:10.1007/BF00008238

Abstract

The insecticide permethrin (a synthetic pyrethroid) was applied into enclosures (1 m diameter and 3.5 m deep) placed in a pond. The chemical was rapidly removed from the water to the sediments. Daphnia rosea and its predator, Chaoborus flavicans were seriously affected by this application and disappeared from the enclosure. Acanthodiaptomus pacificus increased as Chaoborus decreased. Two species of Cladocera which had not been observed before the treatment, established their populations after 10 days, when Chaoborus had not recovered. Whereas Tropocyclops pracinus declined when permethrin was applied at 10 µg 1−1, the number of rotifer Keratella valga increased, suggesting a close relationship between these two species.

Photosynthesis and phytoplankton were not significantly affected by permethrin, except for Ceratium hirundinella. The dominance of Dinobryon divergens continued in the treated enclosures, whereas other flagellate species, Scenedesmus and Nitzschia occurred during the second half of the experiments in the control enclosure and pond.

Key words.

phytoplankton zooplankton trophic interactions insecticide mesocosms 

Copyright information

© Dr W. Junk Publishers 1988

Authors and Affiliations

  • Masayuki Yasuno
    • 1
  • Takayuki Hanazato
    • 1
  • Toshio Iwakuma
    • 1
  • Kenzi Takamura
    • 1
  • Ryuhei Ueno
    • 1
  • Noriko Takamura
    • 1
  1. 1.Division of Environmental BiologyNational Institute for Environmental StudiesYatabe, TsukubaJapan

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