Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): A. Dennis Lemly
    Date: 2000
    Source: Environmental Monitoring and Assessment 63: 43 l-446, 2000.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (874 KB)

    Description

    A combination field and laboratory study was conducted to evaluate the ability of a recently developed bioindicator to detect detrimental nutrient conditions in streams. The method utilizes bacterial growth on aquatic insects to determine nutrient impacts. Field investigations indicated that elevated concentrations of nitrate and phosphate were associated with growth of filamentous bacteria on insect body surfaces, and that there was a significant reduction in the density of major insect taxa in the nutrient-enriched stream reaches. Laboratory investigations confirmed a strong linkage between bacterial growth and reduced survival of insects. Survival was examined for insects with bacterial infestation ranging from 0% to greater than 50% coverage of the body surface. A threshold for catastrophic mortality occurred at about 25% body coverage; there were few survivors above that amount. Based on these findings, the diagnostic endpoint for the bioindicator is 25% body coverage by bacterial growth, a level that signifies major impacts and is also easy to detect visually. This study provides additional evidence that the insect-bacteria bioindicator is a reliable tool for assessing nutrient impacts on stream macroinvertebrate communities. The bioindicator should prove useful for identifying nutrient-impacted sites as well as monitoring the success of management actions to improve water quality.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Lemly, A. Dennis. 2000. Using Bacterial Growth on Insects to Assess Nutrient Impacts in Streams. Environmental Monitoring and Assessment 63: 43 l-446, 2000.

    Keywords

    aquatic bacteria, benthic macroinvertebrates, bioindicator, eutrophication, nitrogen, phosphorus, stream pollution

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page