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Maybe the major passerine influx has yet to occur, but here south of
Yarmouth we have good numbers of robins, and redwings and grackles have
arrived in some of their familiar haunts. This has all happened within the
past week or two.
From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]
On Behalf Of John Kearney
Sent: March 28, 2016 12:50 PM
To: naturens@chebucto.ns.ca
Subject: [NatureNS] Nocturnal Migration for the Week of March 21-27, 2016
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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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Maybe the=
major passerine influx has yet to occur, but here south of Yarmouth we hav=
e good numbers of robins, and redwings and grackles have arrived in some of=
their familiar haunts. This has all happened within the past week or=
two.<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11=
=2E0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p><=
/span></p><div><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;pad=
ding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span lang=3DEN-US style=3D=
'font-family:"Tahoma","sans-serif";mso-fareast-language:EN-CA'>From:</span>=
</b><span lang=3DEN-US style=3D'font-family:"Tahoma","sans-serif";mso-farea=
st-language:EN-CA'> naturens-owner@chebucto.ns.ca [mailto:naturens-owner@ch=
ebucto.ns.ca] <b>On Behalf Of </b>John Kearney<br><b>Sent:</b> March 28, 20=
16 12:50 PM<br><b>To:</b> naturens@chebucto.ns.ca<br><b>Subject:</b> [Natur=
eNS] Nocturnal Migration for the Week of March 21-27, 2016<o:p></o:p></span=
></p></div></div><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNo=
rmal><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=
=2E0pt;font-family:"Calibri","sans-serif"'>Only 3 night flight calls were d=
etected over Carleton, Yarmouth County, this week. It included 2 calls by D=
ark-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 t=
he species composition of migrants (including Fox Sparrow and American Robi=
n 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