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Index of Subjects
eyed Junco (28 calls), Fox Sparrow (6), and White-throated Sparrow (5). The
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Hi Carmel and all,
I can=E2=80=99t say that I was expecting the two spikes in late =
September but, on the other hand, I was not surprised. I saw a similar =
trend at my Glasgow Head site in Guysborough County last year. In the =
case of my Carleton site, the total flight calls recorded between 10 =
August and 31 October in 2015 and 2016 is almost the same! In 2015 the =
total for that period was 8,107 and for 2016, it was 7,967. That is a =
difference of only 1.7%. Yet, the occurrence of the peaks in migration =
are quite different in the two years as indicated in this graph =
<http://www.johnfkearney.com/ESW/Images/2016vs2015.png> . Other studies =
have shown that migration tends to be concentrated into a few nights of =
every season, and these peaks are often related to weather patterns. My =
sense from others who monitor the autumn migration is that birds are =
both leaving earlier and staying later than in the past. If true, this =
might be more related to climate trends rather than a specific weather =
pattern during a season. In addition, the Spruce Budworm outbreak in the =
eastern boreal forest seems to be resulting in increases in certain =
warbler species and thus may affect when we see pulses of migration.
=20
I have been conducting acoustic monitoring since 2010. I have recorded =
and analyzed at least one full season (spring, autumn, or both) at 15 =
sites. One site will soon have 3 years of data, and a few other sites =
will have two years of data. My original goal was to identify high =
traffic migration corridors in the province. With time, there will be a =
greater capacity to discern population trends. I believe that acoustic =
monitoring supplements and enhances migration studies involving observer =
counts, radar, banding, and electronic tagging. My long-term goal is to =
promote advances in and emphasis on research technologies, such as =
acoustic monitoring, that do not involve the capture of birds.
=20
Thanks again for your interest!
=20
John=20
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Carmel Smith
Sent: November-01-16 21:00
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Nocturnal Migration for the 4th Week of October
=20
Hi John,=20
=20
A couple of questions for you!
=20
1. Were you expecting those two huge spikes seen during the last ten =
days or so of September?=20
2. How long have you been doing this and analysing the data? (How many =
years back can you plot the migration patterns for these sites?)
thanks for sharing your work,
Carmel Smith
Midville Branch, NS
=20
On Tuesday, November 1, 2016 5:00 PM, John Kearney < =
<mailto:john.kearney@ns.sympatico.ca> john.kearney@ns.sympatico.ca> =
wrote:
=20
Hi All,
Nocturnal migration declined further this week at Carleton, Yarmouth =
County. Total calls fell to 49 with an estimated minimum of 29 =
individual birds. The most common calls were Dark-eyed Junco (28 calls), =
Fox Sparrow (6), and White-throated Sparrow (5). The first American Tree =
Sparrow was heard at 8 minutes past midnight on 28 October.
Sparrows accounted for 86% of all calls and warblers for 12%. The two =
warbler species recorded were Blackpoll Warbler and Yellow-rumped =
Warbler.
The weather radar at Caribou, Maine, displayed a corresponding paucity =
of migrants. The number of echoes was somewhat higher in Portland, =
Maine, while there still seemed to be nights of good migration in the =
mid-Atlantic states.
A summary table is found below and additional information with table and =
charts can be found =
<http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html> here.
John
=09
Estimated
=09
Total
Minimum
Species
Calls
Individuals*
Dark-eyed Junco
28
11
Fox Sparrow
6
5
White-throated Sparrow
5
5
Blackpoll Warbler
3
3
Killdeer
3
1
Unidentified Sparrow
2
2
American Tree Sparrow
1
1
Yellow-rumped Warbler
1
1
Total
49
29
* 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
=20
=20
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