Wetlands

, Volume 16, Issue 1, pp 38–44

Response of ducks to glyphosate-induced habitat alterations in wetlands

  • George M. Linz
  • Dage C. Blixt
  • David L. Bergman
  • William J. Bleier
Article

DOI: 10.1007/BF03160644

Cite this article as:
Linz, G.M., Blixt, D.C., Bergman, D.L. et al. Wetlands (1996) 16: 38. doi:10.1007/BF03160644

Abstract

The effects of glyphosate herbicide-induced changes in wetland emergent vegetation (largely cattails,Typha spp.) on densities of ducks (Anatinae) were assessed in northeastern North Dakota. In 1990 and 1991, 17 cattail-dominated wetlands were randomly assigned to 0% (reference wetlands), 50%, 70%, or 90% areal spray coverages with glyphosate herbicide. Densities of green-winged teal (Anas crecca), bluewinged teal (Anas discors), gadwalls (Anas strepera), and ruddy ducks (Oxyura jamaicensis) were similar among treatments during both post-treatment years (P≥0.1). One year post-treatment, mallard (Anas platyrhynchos) and northern pintail (Anas acuta) abundances did not differ among treatments (P≥0.1), whereas two years post-treatment their abundances were greater in the sprayed wetlands than in the reference wetlands (P≤0.1). Densities of northern shovelers (Anas clypeata) and redheads (Aythya americana) differed among treatments in both post-treatment years, with the 50% sprayed wetlands harboring more ducks than did the other three treatments. Percent coverage and hectares of open water were positively correlated with numbers of diving ducks (Aythyini and Oxyurini) (P≤0.1). Dabbling duck (Anatini and Cairinini) numbers correlated positively with hectares of open water and dead vegetation, whereas their numbers were negatively correlated with percent coverage of live vegetation (P≤0.1). Results of this study suggest that numbers of ducks were positively influenced by creating a mosaic of open water, live vegetation, and dead vegetation with glyphosate herbicide.

Key Words

cattailsdabbling ducksdiving ducksglyphosatewaterfowlwetlandshabitat managementTypha

Copyright information

© Society of Wetland Scientists 1996

Authors and Affiliations

  • George M. Linz
    • 1
  • Dage C. Blixt
    • 2
  • David L. Bergman
    • 1
  • William J. Bleier
    • 2
  1. 1.U. S. Department of Agriculture Denver Wildlife Research Center North Dakota Field StationNorth Dakota State UniversityFargo
  2. 2.Department of Zoology Stevens HallNorth Dakota State UniversityFargo
  3. 3.P.O. Drawer FW, Room 200, Forest Resources Bldg.Mississippi State University
  4. 4.U.S. Department of AgricultureAnimal Damage ControlBismarck