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): Jaime L. Stephens; Sarah M. Rockwell; C. John Ralph; John D Alexander
    Date: 2015
    Source: Northwestern Naturalist. 96(3): 196-204.
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (314.0 KB)

    Description

    We monitored the Black Tern (Childonias niger) population at Agency and Upper Klamath Lakes, in the Klamath Basin, Oregon, from 2001–2010. We estimated that the population of adult Black Terns declined at these 2 joined waterbodies by 8.4% annually. In contrast, our analysis of Breeding Bird Survey data for the Bird Conservation Region 9/Great Basin during the same period did not detect a trend. Knowledge of local short-term trends in the Klamath Basin can contribute to understanding regional and continental population declines of this species. Water levels, which may affect both habitat availability and suitability, were relatively stable from 2001–2009, but dropped in 2010 and remained depressed from 2010–2014. The direct effect of water-level fluctuations on habitat availability (hectares of habitat loss) is not well understood. Water allocation is a management challenge in this region and has been exacerbated by recent drought conditions. In combination, understanding trends and causal factors can inform water management, restoration, and habitat protection, all of which may contribute to reversing the decline of breeding terns.

    Publication Notes

    • You may send email to psw_communications@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

    Stephens, Jaime L.; Rockwell, Sarah M.; Ralph, C. John; Alexander, John D. 2015. Decline of the Black Tern (Chlidonias niger) population in the Klamath Basin, Oregon, 2001-2010. Northwestern Naturalist. 96(3): 196-204.

    Cited

    Google Scholar

    Keywords

    Bird Conservation Region 9/Great Basin, Black Tern, Breeding Bird Survey, Chlidonias niger, Klamath Basin, land management, Oregon, population trends, volunteer monitoring, wetland

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/52270