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): Esteban Fernandez-Juricic; Patrick A. Zollner; Cherie LeBlanc FisherLynne M. Westphal
    Date: 2007
    Source: Waterbirds. 30(4): 554-565.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (235.0 KB)

    Description

    We assessed the effects of the presence and the frequency of canoe and pedestrian disturbance during two breeding seasons on multiple behavioral responses (scanning, freezing, grooming, sleeping, moving, wing-raising, and standing-up) of Black-crowned Night Heron ( Nycticorax nycticorax ) nestlings in a breeding colony in southeast Chicago. Short-term responses (min) of Black-crowned Night Heron nestlings showed that they were sensitive to the presence of aquatic and pedestrian disturbance by increasing vigilant (scanning) and anti-predator (freezing) behaviors and decreasing maintenance (grooming, sleeping) behaviors. Nestlings were also sensitive to recreationist behavior, with less time allocated to sleeping and more time to freezing and scanning in the presence of inquisitive pedestrians than pedestrians who passed by the colony without stopping. However, medium-term responses (days) were insensitive to the frequency of disturbance, but spatial proximity to the source of disturbance influenced time scanning, sleeping, and freezing). Our results have wide implications for the protection of the Black-crowned Night Heron in States in which it is considered a species of conservation concern. We recommend that boating activities should be precluded during the initial part of the breeding season and buffer zones of 50 m should be established around the colony to minimize human disturbance. However, under these conditions, restrictions on the number of visitors during the breeding period may not be necessary.

    Publication Notes

    • Check the Northern Research Station web site to request a printed copy of this publication.
    • Our on-line publications are scanned and captured using Adobe Acrobat.
    • During the capture process some typographical errors may occur.
    • Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.
    • 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

    Fernandez-Juricic, Esteban; Zollner, Patrick A.; LeBlanc, Cherie; Westphal, Lynne M. 2007. Responses of nestling black-crowned night herons (Nycticorax nycticorax) to aquatic and terrestrial recreational activities: a manipulative study. Waterbirds. 30(4): 554-565.

    Cited

    Google Scholar

    Keywords

    colonial waterbirds, frequency of disturbance, human disturbance, human-wildlife coexistence, recreational activities

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/50822