Effect of diflubenzuron application on eastern deciduous forest birds
We conducted a replicated experiment in eastern West Virginia to examine the effect of diflubenzuron on the abundance of deciduous forest birds. Diets of 7 insectivorous bird species and foraging behavior of male red-eyed vireos (Vireo olivaceus) also were examined in treated and untreated areas. Al...
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Veröffentlicht in: | The Journal of wildlife management 1990-07, Vol.54 (3), p.486-493 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We conducted a replicated experiment in eastern West Virginia to examine the effect of diflubenzuron on the abundance of deciduous forest birds. Diets of 7 insectivorous bird species and foraging behavior of male red-eyed vireos (Vireo olivaceus) also were examined in treated and untreated areas. Although caterpillars were less common on treated areas, none of the 21 common bird species was significantly (P < 0.10) more abundant in untreated than treated plots. Significant differences in the percentage of Lepidoptera larvae in diets were observed for all species examined except the worm-eating warbler (Helmitheros vermivorus) and blue-gray gnatcatcher (Polioptila caerulea). Two different measures of area covered per unit time spent foraging indicated that vireo foraging areas were 3.1 and 2 times larger on treated areas than on untreated areas, respectively. Differences in diet and foraging behavior were likely related to the decrease in abundance of caterpillars on treated plots. |
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ISSN: | 0022-541X 1937-2817 |
DOI: | 10.2307/3809663 |