Since 1981, more than 7,000 wind turbines have been installed in
the Altamont Wind Resource Area in north-central California.
Currently, about 5,000 turbines are operating. Past research
efforts demonstrated that wind turbines frequently kill birds,
especially raptors. Little is known about the specific flight and
perching behaviors by birds near wind turbines. A better
understanding of these interactions may one day yield insights on
how to minimize bird fatalities. This Phase I progress report
summarizes research findings obtained at 20 study plots totaling
785 turbines of various configurations and conducted between March
1998 and February 1999. We examined bird use and behaviors and
collected data on fatalities at the same turbines throughout the
course of our surveys. We completed 745 30-minute point counts
(1,702 bird observations) that quantified bird risk behaviors and
bird use of the study plots. The four most frequently observed bird
species were red-tailed hawks, common ravens, turkey vultures, and
golden eagles. During the same period, we recorded 95 bird
fatalities. Raptors represent 51 percent (n=49) of the kills found.
The data indicate that the relative abundance of species observed
does not predict the relative frequency of fatalities per species.
Phase II of the research is underway.
|Country of origin:
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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