Response of American coots and soras to herbicide-induced vegetation changes in wetlands
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Published source details
Linz G.M., Bergman D.L., Blixt D.C. & McMurl C. (1997) Response of American coots and soras to herbicide-induced vegetation changes in wetlands. Journal of Field Ornithology, 68, 450-457.
Published source details Linz G.M., Bergman D.L., Blixt D.C. & McMurl C. (1997) Response of American coots and soras to herbicide-induced vegetation changes in wetlands. Journal of Field Ornithology, 68, 450-457.
Actions
This study is summarised as evidence for the following.
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Treat wetlands with herbicide Action Link |
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Treat wetlands with herbicide
A controlled, replicated before and after study in 1990-1993 in 20 inland wetlands in North Dakota, USA (Linz et al. 1997), found that, two years after treatment, densities of American coot Fulica americana were significantly higher at wetlands sprayed with herbicide (0.8-1.0 birds/ha) than at untreated sites (0.2 birds/ha), but that sora Porzana carolina densities were significantly lower (0.1-0.3 birds/ha vs. 0.5). Coot densities were positively correlated with extent of open water and negatively with live emergent vegetation; sora densities were positively correlated with live emergent vegetation. Four sites had 90% coverage with glyphosate (aerially applied), eight had 70% coverage, four 50% and four were controls, with no coverage. No coots were found on any wetlands before treatment.
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