1. Fate and effects of the insecticide Dursban^® 4E in indoor Elodea-dominated and macrophyte-free freshwater model ecosystems: II. Secondary effects on community structure

   • T. C. M. Brock
   • M. van den Bogaert
   • R. M. M. Roijackers

   OriginalPaper Pages: 391 - 409

2. Effects of treated paper mill effluents on hepatic morphology in male bullhead (Cottus gobio L.)

   • Franz Bucher
   • Rudolf Hofer
   • Willi Salvenmoser

   OriginalPaper Pages: 410 - 419

3. Ultrastructural changes in Dunaliella minuta following acute and chronic exposure to copper and cadmium

   • Ioanna Visviki
   • Joseph W. Rachlin

   OriginalPaper Pages: 420 - 425

4. Structural changes of proteins in fish red blood cells after copper and mercury treatment

   • Krzysztof Gwozdzinski

   OriginalPaper Pages: 426 - 430

5. Heavy metal and selenium concentrations in black skimmers (Rynchops niger): Gender differences

   • Joanna Burger
   • M. Gochfeld

   OriginalPaper Pages: 431 - 434

6. Heavy metal and selenium levels in young cattle egrets from nesting colonies in the northeastern United States, Puerto Rico, and Egypt

   • Joanna Burger
   • Katharine Parsons
   • Michael Gochfeld

   OriginalPaper Pages: 435 - 439

7. The toxicity of selenium in experimental freshwater ponds

   • Mark Crane
   • Tim Flower
   • Samantha Watson

   OriginalPaper Pages: 440 - 452

8. Lead and cadmium in birds in the Netherlands: A preliminary survey

   • L. C. M. P. Hontelez
   • H. M. van den Dungen
   • A. J. Baars

   OriginalPaper Pages: 453 - 456

9. Subchronic toxicity and reproduction effects of tri-n-butyltin oxide in Japanese quail

   • Theodora M. M. Coenen
   • Abraham Brouwer
   • Jan H. Koeman

   OriginalPaper Pages: 457 - 463

10. Comparative phytotoxicity of the fumonisins, AAL-toxin and yeast sphingolipids in Lemna minor L. (duckweed)

    • Ronald F. Vesonder
    • Robert E. Peterson
    • Hamed K. Abbas

    OriginalPaper Pages: 464 - 467

11. Hydrolysis of ochratoxin A by the microbial activity of digesta in the gastrointestinal tract of rats

    • M. S. Madhyastha
    • R. R. Marquardt
    • A. A. Frohlich

    OriginalPaper Pages: 468 - 472

12. Disposition, behavior, and toxicity of methylcyclopentadienyl manganese tricarbonyl in the mouse

    • Junko Komura
    • Michiko Sakamoto

    OriginalPaper Pages: 473 - 475

13. Reliability of heavy metal pollution monitoring utilizing aquatic animals versus statistical evaluation methods

    • Zoltán Mastala
    • Katalin V.-Balogh
    • János Salánki

    OriginalPaper Pages: 476 - 483

14. Temporal scales in ecological risk assessment

    • Joanna Burger
    • Michael Gochfeld

    OriginalPaper Pages: 484 - 488

15. Announcements

    Announcement Pages: 489 - 489