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Hi All,
Nocturnal migration at Carleton, Yarmouth County, intensified further this
week. A total of 598 calls were recorded at a rate of 85 calls per night.
These represent an estimated minimum of 475 individuals and 22 warbler, 2
thrush, 2 sparrow, and 1 sandpiper species. The most abundant species were
American Redstart, Ovenbird, Magnolia Warbler, and Black-and-White Warbler,
in that order. Peak nights were 19 and 20 August when 177 and 122 calls were
recorded respectively.
The intensity of radar echoes at Caribou, Maine, was greatest on the nights
of 17-19 August. On these nights, the echo intensity ranged between 15-20
decibels which would represent about 100-225 birds per cubic kilometer. This
lag between the intensity of migration at Caribou and Carleton may be the
result of weather systems passing through Caribou first.
Graphs recently added to my website show that the number of flight calls at
Carleton increases with increasing intensity of echoes on the Caribou radar.
Another graph illustrates that most birds flying over Carleton correspond to
southwest movements of echoes on the Caribou radar. These graphs and this
summary can be found at:
<http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html>
http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html.
This week saw increases over last week in Common Yellowthroat and Northern
Waterthrush. The first Blackpoll Warblers of the year appeared this week. A
summary of all observations follows below.
It should be noted as well that field observers, including myself, saw large
numbers of Red-breasted Nuthatches this week. Although a nocturnal migrant,
they are infrequently recorded on acoustic monitoring devices. However,
these movements of nuthatches correspond to the dates when warblers were
moving in Carleton.
John
Estimated
Call
Minimum
Species
Count
Individuals*
American Redstart
67
49
Ovenbird
65
50
Magnolia Warbler
53
39
Black-and-White Warbler
52
40
Unidentified Warbler
50
42
Chestnut-sided Warbler
45
30
Northern Parula
43
33
Yellow Warbler
35
30
Common Yellowthroat
33
25
Unidentified Warbler Genus Setophaga
26
24
Northern Waterthrush
24
23
Black-throated Blue Warbler
20
14
Blackburnian Warbler
15
15
Yellow-rumped Warbler
13
12
Black-throated Green Warbler
6
4
Nashville Warbler
6
4
Tennessee Warbler
5
5
Bay-breasted Warbler
4
4
Blackpoll Warbler
4
4
Canada Warbler
4
4
Cape May Warbler
4
4
Unidentified Warbler Genus Oreothlypis
4
4
Prairie Warbler
4
2
Swainson's Thrush
4
3
Unidentified Songbird
3
3
Palm Warbler
2
2
Solitary Sandpiper
2
1
Wilson's Warbler
2
2
Chipping Sparrow
1
1
Song Sparrow
1
1
Veery
1
1
Total
598
475
* 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:12.0pt;font-family:"Book Antiqua",serif'>Hi =
All,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Book Antiqua",serif'>Nocturnal =
migration at Carleton, Yarmouth County, intensified further this week. A =
total of 598 calls were recorded at a rate of 85 calls per night. These =
represent an estimated minimum of 475 individuals and 22 warbler, 2 =
thrush, 2 sparrow, and 1 sandpiper species. The most abundant species =
were American Redstart, Ovenbird, Magnolia Warbler, and Black-and-White =
Warbler, in that order. Peak nights were 19 and 20 August when 177 and =
122 calls were recorded respectively.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Book =
Antiqua",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Book Antiqua",serif'>The =
intensity of radar echoes at Caribou, Maine, was greatest on the nights =
of 17-19 August. On these nights, the echo intensity ranged between =
15-20 decibels which would represent about 100-225 birds per cubic =
kilometer. This lag between the intensity of migration at Caribou and =
Carleton may be the result of weather systems passing through Caribou =
first.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Book =
Antiqua",serif'><o:p> </o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Book Antiqua",serif'>Graphs =
recently added to my website show that the number of flight calls at =
Carleton increases with increasing intensity of echoes on the Caribou =
radar. Another graph illustrates that most birds flying over Carleton =
correspond to southwest movements of echoes on the Caribou radar. These =
graphs and this summary can be fou