Effects of polycyclic aromatic hydrocarbons (PAHs) on an aquatic ecosystem: Acute toxicity and community-level toxic impact tests of benzo[a]pyrene using lake zooplankton community

Yoshinori Ikenaka, Masaki Sakamoto, Takamaru Nagata, Hirokazu Takahashi, Yuichi Miyabara, Takayuki Hanazato, Mayumi Ishizuka, Tomohiko Isobe, Jun Woo Kim, Kwang Hyeon Chang

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35 Citations (Scopus)

Abstract

We estimated acute toxicity of benzo[a]pyrene (B[a]P) using two cladoceran species, Ceriodaphnia reticulata and Daphnia magna, and also analyzed its impact on zooplankton community throughout an exposure experiment using small-scale mesocosms. LC50 of B[a]P for C. reticulata and D. magna was 4.3 and 4.7 μg/l, respectively. However, individuals fed with Chlorella showed higher LC50, 6.1 μg/l for C. reticulata and 8.0 μg/l for D. magna. In the exposure experiment, we examined the impact of B[a]P on zooplankton community using conceivable concentrations in the environment (5 and 10 μg/l) using typical zooplankton community in eutrophicated systems. Despite the residence time of B[a]P in the water column was short as < 4 days, application of B[a]P induced decrease of zooplankton abundance. However, the recovery pattern was different among cladocerans and rotifers. Consequently, B[a]P showed insecticide-like impacts, suppressing cladoceran populations and inducing the dominance of rotifers particularly under high concentration (10 μg/l). Results have suggested that, even such short duration of B[a] P in the water body can have impact on zooplankton abundance and community structure. Since B[a]P easily precipitate to the bottom and rapidly disappears from the water body, careful monitoring and further assessment of the potential toxicity of polycyclic aromatic hydrocarbons are necessary.

Original languageEnglish
Pages (from-to)131-136
Number of pages6
JournalJournal of Toxicological Sciences
Volume38
Issue number1
DOIs
Publication statusPublished - Feb 2013

Keywords

  • Cladocera
  • Mesocosm
  • Principle response curves
  • Rotifer

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