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Hi All,
Nocturnal movements of birds over Carleton, Yarmouth County, ranged from 1
to 33 calls per night with an average of 18. The total was 183. Warblers
predominated with the early migrating American Redstart being the most
common. But the second most common warbler was Northern Parula, a warbler
that tends to peak in September. This would indicate that the birds were a
mix of birds in post-breeding dispersion and early migrants. The half-dozen
sparrows (mainly White-throats) were likely moving between habitats rather
than migrating. One Swainson's Thrush giving a flight call about an hour
after sunset on 26 July might have been a local bird leaving or expressing
migratory restlessness. The inland sandpipers, Spotted and Solitary, were
heard regularly during the period. All species recorded are listed in the
summary table below.
The highest number of calls was recorded on the night of 31 July to 1
August. On that night, the Portland, Maine, radar was operating in
precipitation mode but the Caribou, Maine, radar was in clear air mode. The
density of echoes over Caribou was light through most of the night (about 60
per cubic km). The direction of movement was west-southwest. The dominant
speed was 20 to 30 km per hour with a smaller number moving at 30-40 km per
hour. These speeds indicate that the echoes were birds rather than insects,
but insects may have contributed to the overall density of echoes.
John
Estimated
Call
Minimum
Species
Count
Individuals*
American Redstart
32
22
Northern Parula
21
15
Black-and-White Warbler
20
12
Magnolia Warbler
13
10
Blackburnian Warbler
7
7
Chestnut-sided Warbler
7
6
Solitary Sandpiper
30
5
Yellow-rumped Warbler
6
5
Black-throated Blue Warbler
6
4
Spotted Sandpiper
11
4
White-throated Sparrow
5
4
Common Yellowthroat
4
3
Ovenbird
6
3
Unidentified Warbler
3
3
Unidentified Sparrow
2
2
Unidentified Warbler Genus Setophaga
2
2
Black-throated Green Warbler
1
1
Canada Warbler
1
1
Cape May Warbler
1
1
Nashville Warbler
1
1
Palm Warbler
2
1
Swainson's Thrush
1
1
Unknown Bird
1
1
Total
183
114
* 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
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Hi =
All,<o:p></o:p></span></p><p class=3DMsoNormal>Nocturnal movements of =
birds over Carleton, Yarmouth County, ranged from 1 to 33 calls per =
night with an average of 18. The total was 183. Warblers predominated =
with the early migrating American Redstart being the most common. But =
the second most common warbler was Northern Parula, a warbler that tends =
to peak in September. This would indicate that the birds were a mix of =
birds in post-breeding dispersion and early migrants. The half-dozen =
sparrows (mainly White-throats) were likely moving between habitats =
rather than migrating. One Swainson’s Thrush giving a flight call =
about an hour after sunset on 26 July might have been a local bird =
leaving or expressing migratory restlessness. The inland sandpipers, =
Spotted and Solitary, were heard regularly during the period. All =
species recorded are listed in the summary table below.<o:p></o:p></p><p =
class=3DMsoNormal>The highest number of calls was recorded on the night =
of 31 July to 1 August. On that night, the Portland, Maine, radar was =
operating in precipitation mode but the Caribou, Maine, radar was in =
clear air mode. The density of echoes over Caribou was light through =
most of the night (about 60 per cubic km). The direction of movement was =
west-southwest. The dominant speed was 20 to 30 km per hour with a =
smaller number moving at 30-40 km per hour. These speeds indicate that =
the echoes were birds rather than insects, but insects may have =
contributed to the overall density of echoes.<o:p></o:p></p><p =
class=3DMsoNormal>John<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><table class=3DMsoNormalTable =
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5.4pt;height:15.0pt'></td><td width=3D83 nowrap valign=3Dbottom =
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style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif;color:black;ms=
o-fareast-language:EN-CA'>Estimated<o:p></o:p></span></p></td></tr><tr =
style=3D'