The rate of nocturnal movements of warblers almost doubled over the previous
week at Carleton, Yarmouth County, Nova Scotia. There was a total of 240
calls and at least 181 individual birds at a rate of 34 calls per night.
Warblers composed 99% of the calls recorded. Despite a continuing variety in
species composition, early migrating warbler species dominated the count.
The most common species were American Redstart (69 calls), Black-and-White
Warbler (45 calls), and Yellow Warbler (34 calls). The numbers of these
three species seemed to indicate true, south-bound migration, rather than
post-breeding dispersion. A summary list can be found below.
The closest weather radar that provide online base reflectivity and velocity
data while operating in clear air mode are in the state of Maine, at Caribou
and Portland. Both of these radars are located approximately 350 kilometers
from the monitoring station. The radars showed only a light density of
echoes (~60-70/cubic km) during the week. Velocities indicated that there
was some bird migration on each night when there was no rain.
Previous reports and more information can be found at:
Black-throated Blue Warbler
Unidentified Warbler Genus Setophaga
Black-throated Green Warbler
Cape May Warbler
* Calls that are more than one minute apart plus calls that are less than
one minute apart divided by three and rounded up to nearest whole number
John F. Kearney
120 White's River Road
Carleton, Nova Scotia
CANADA B5A 5R2
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