Monitoring the effects of Spraying for Spruce Budworm on Songbirds in Maine – 1979
- Drury, William H.
- Folger, David
- Conver, Garrett
The public in Maine will no longer acquiesce to spraying pesticides on
a major percentage of the forest area of northern Maine without searching
analysis and justification. In response to this, the Bureau of Forestry
commissioned a study of regional populations of songbirds, as one of the
studies needed to monitor effects on wildlife.
We used techniques developed by the U.S. Fish & Wíldlife Servíce for
assessing large-scale, long-term population trends in birds. Two observers
stopped at every half mile along twenty-three transects of 20 miles each"
At each stop the observers recorded all birds heard or seen during three
minutes. We discuss the advantages and limitations of the technique and
the major alternative
Because virtually all the areas of northern Maine in which spruce and
fir are the dominant trees were sprayed and all the unsprayed areas were
vegetated with hardwoods, our program lacked valid controls against which
to compare our data from sprayed areas. We found no differences between
the songbird populations along 300 miles of transects in sprayed areas and
those along 160 miles of transects in unsprayed areas.
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