Notice - This site contains archived material(s)
Archive disclaimer
Archive
disclaimer
Archived files are provided for reference
purposes only. These files are no longer maintained by the Agency and may be outdated. For
current EPA information, go to www.epa.gov. It is EPA's policy to
support reasonable accommodation to persons with disabilities, pursuant to the Rehabilitation
Act of 1973, 29 U.S.C. 791. If you need assistance with accessing archived files, contact
EPA's Reasonable Accommodations
or submit a request using the Contact Us form.
Abstract
Summarizing presentations at a symposium on air pollutant effects on aquatic ecosystems, this document includes an overview of U.S. research programs, atmospheric emissions and deposition, cycling processes, and effects on plants and animals. Current U.S. research addresses ecosystem classification and inventory by sensitivity to acidity, interactions between watershed terrestrial and aquatic ecosystems, and effects. Atmospheric input to aquatic ecosystems may be gaseous or particulate and by wet and dry deposition. Particle dry deposition is most predictable; gaseous dry deposition models exist but are not yet reliable for regional scale. Linear correlation may exist between air sulfate content and deposition acidity. Source apportionment has been used to relate deposition to emission sources. Radioactive isotope studies of cycling processes within aquatic ecosystems have shown that particulate metals are usually removed from the aqueous phase by sedimentation rather than with outflowing water. A chronological record of atmospheric inputs to aquatic ecosystems may be found in carefully taken sediment samples.
Citation
Elias, R., T. Inge, AND P. Ward. AIR POLLUTION EFFECTS ON AQUATIC ECOSYSTEMS: SUMMARY OF A SYMPOSIUM. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/9-84/010 (NTIS PB84185214), 1984.