, 287:161 | Cite as

Molluscan cellulolytic activity responses to zinc exposure in laboratory and field stream comparisons

  • J. L. Farris
  • J. L. Grudzien
  • S. E. Belanger
  • D. S. Cherry
  • J. CairnsJr.


Changes in cellulolytic activity of Asiatic clams (Corbicula fluminea) and snails (Mudalia dilatata) were monitored throughout 30-d exposures to constant additions (0.0, 0.025, 0.05, 0.50, and 1.0 mg l−1) of zinc (Zn). All exposures of 0.05 mg Zn 1−1 or greater significantly reduced enzyme activity (exo- and endocellulase) in both molluscs as early as 10 d following exposures in outdoor laboratory streams incorporating New River water as diluent. More sterile laboratory stream exposures were less consistent in yielding quantifiable differences that could be attributed to metal induced stress apart from effects of nutritional stress. Tests conducted under natural field conditions during all seasons did not differ significantly with respect to changes in annual energetics of either clams or snails. However, evidence of differing uptake routes, with respect to two ecologically and physiologically distinct molluscs, was apparent in bioaccumulation, growth, and enzyme activity throughout exposure and following 60-d recovery.

Key words

zinc cellulolytic activity molluscs monitoring artificial streams 


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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • J. L. Farris
    • 1
  • J. L. Grudzien
    • 2
  • S. E. Belanger
    • 3
  • D. S. Cherry
    • 1
  • J. CairnsJr.
    • 1
  1. 1.Department of Biology and University Center for Environmental and Hazardous Materials StudiesVirginia Polytechnic Institute and State UniversityBlacksburgUSA
  2. 2.Grace Bio-Oncology, Inc.PontiacUSA
  3. 3.Environmental Safety Department, The Procter and Gamble CompanyIvorydale Technical CenterCincinnatiUSA

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