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Hi All,
Only 3 night flight calls were detected over Carleton, Yarmouth County, this
week. It included 2 calls by Dark-eyed Junco on March 23 and a Song Sparrow
just after midnight on March 28. While the night flight calls recorded so
far may accurately represent the species composition of migrants (including
Fox Sparrow and American Robin last week), the numbers probably do not.
Typically, nocturnal monitoring in the spring yields much smaller number of
passerines than in the autumn. In addition, early banding studies of Song
Sparrows in the 1950s indicated that there may be some diurnal migration in
the spring. The large flocks of Juncos seen at this time of year also
represent birds that fly singly at night but aggregate into flocks during
the day.
This spring I am also monitoring the weather radar at Caribou, Maine for
evidence of nocturnal migration. This radar site is about 350 kilometers
from the Carleton station. Unlike Canadian weather radar which only
broadcasts in precipitation mode online, American radar also broadcasts in
clear air mode, making it possible to detect birds. So far this spring, no
bird migration could be seen on the Caribou radar. However, on March 24,
there appeared to be noticeable bird migration in south central New York
state. On the night of March 26, this migration had extended to eastern New
York state and western Massachusetts. On March 27, migration could be
detected as close as Portland, Maine.
If I am reading these radar sites correctly, we have not yet had a large
influx of passerines.
A summary of the year so far can be found at:
http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html.
John
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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><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Only 3 night =
flight calls were detected over Carleton, Yarmouth County, this week. It =
included 2 calls by Dark-eyed Junco on March 23 and a Song Sparrow just =
after midnight on March 28. While the night flight calls recorded so far =
may accurately represent the species composition of migrants (including =
Fox Sparrow and American Robin last week), the numbers probably do not. =
Typically, nocturnal monitoring in the spring yields much smaller number =
of passerines than in the autumn. In addition, early banding studies of =
Song Sparrows in the 1950s indicated that there may be some diurnal =
migration in the spring. The large flocks of Juncos seen at this time of =
year also represent birds that fly singly at night but aggregate into =
flocks during the day.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>This spring =
I am also monitoring the weather radar at Caribou, Maine for evidence of =
nocturnal migration. This radar site is about 350 kilometers from the =
Carleton station. Unlike Canadian weather radar which only broadcasts in =
precipitation mode online, American radar also broadcasts in clear air =
mode, making it possible to detect birds. So far this spring, no bird =
migration could be seen on the Caribou radar. However, on March 24, =
there appeared to be noticeable bird migration in south central New York =
state. On the night of March 26, this migration had extended to eastern =
New York state and western Massachusetts. On March 27, migration could =
be detected as close as Portland, Maine.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>If I am =
reading these radar sites correctly, we have not yet had a large influx =
of passerines.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>A summary of =
the year so far can be found at: <a =
href=3D"http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html">ht=
tp://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html</a>. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>John</span><o=
:p></o:p></p></div></body></html>
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