Hydrobiologia

, Volume 284, Issue 2, pp 157–168 | Cite as

Short term toxicity of iron (Fe) and lead (Pb) to the mayfly Leptophlebia marginata (L.) (Insecta) in relation to freshwater acidification

  • A. Gerhardt
Article

Abstract

The mayfly Leptophlebia marginata was exposed to different concentrations of Fe2+ or Pb2+ at pH 4.5 and pH 7.0. The effects of the metals on escape behavior and survival of the mayflies were investigated during an exposure of 120 hours.

  1. (1)

    Whole-body metal loads (Fe; Pb) of the mayflies increased in a dose-dependent way at both pH levels. A significant effect of pH on metal concentration in the mayflies was only found for Pb (p < 0.001).

     
  2. (2)

    In terms of mortality, both metals were more toxic at pH 4.5 than at pH 7. The 96 h-LC50 values for Fe were 106.3 mg Fe l-1 at pH 7 and 89.5 mg Fe l-1 at pH 4.5. Those for Pb were > 5 mg Pb l-1 at pH 7 and 1.09 mg Pb l-1 at pH 4.5.

     
  3. (3)

    The mayflies lost their escape behavior, when exposed to the metals, the effects being more pronounced at low than at circumneutral pH for both metals (p < 0.05). The 96 h-EC50 values for Fe were 70.0 mg Fe l-1 at pH 7 and 63.9 mg Fe l-1 at pH 4.5.

     

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • A. Gerhardt
    • 1
  1. 1.Dept of Ecology, EcotoxicologyLund UniversityLundSweden

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