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ram (also known as a sonogram) since flight calls are ver
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Oh, yeah, later migrants! Now I get it! J!
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From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of John Kearney
Sent: August-21-14 2:42 PM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Nocturnal Migration for the Week of August =
11-17, 2014
=20
John,
Based on past years of acoustic monitoring, Northern Parula peak in 1st =
two weeks of September.
John
Sent from my iPhone
On Aug 21, 2014, at 14:19, John and Nhung <nhungjohn@eastlink.ca> wrote:
The relatively low frequency of parulas is interesting, too. Earlier in =
the year, I heard them calling fairly often in various places down my =
way around Yarmouth. Are they early migrants?
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From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of John Kearney
Sent: August-21-14 11:13 AM
To: naturens@chebucto.ns.ca
Subject: [NatureNS] Nocturnal Migration for the Week of August 11-17, =
2014
=20
Hi All,
This year I am conducting acoustic monitoring of nocturnal migration =
over Amherst, Nova Scotia. I will try to report results on a weekly =
basis to NatureNS. This work is funded by Natural Forces Inc. and is =
part of an environmental assessment for a proposed wind energy facility. =
Since the acoustic work is being done remotely, I=E2=80=99m using =
battery powered recording equipment that doesn=E2=80=99t have as a high =
a reach into the sky (about 150 meters) compared to equipment that can =
be connected to an electric line (with a reach of about 300 meters).
=20
As for this week results, most flight calls were the early migrating =
warblers. These are dominated by American Redstarts (121 calls) and =
Yellow Warblers (63 calls). The number of Chestnut-sided Warblers (58 =
calls) is higher than what I have experienced previously in Nova Scotia. =
There were also unusually high numbers of Canada Warbler (28 calls) and =
Cape May Warbler (26 calls). The rarest bird was Prairie Warbler with 4 =
calls detected. A total of 515 calls were detected during the 7-day =
period. A list of all birds detected is given below in order of the =
highest to lowest number of calls detected.
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At the beginning of this migration season, I wish to highlight some main =
features of acoustic monitoring of nocturnal migration.
Results are reported in terms of the number of calls and not the number =
of birds recorded since it is not possible to determine if a bird has =
given more than one call during the time it was recorded.
Night flight calls are primarily identified by looking at the =
spectrogram (also known as a sonogram) since flight calls are very =
difficult to identify by just listening to them. For many species their =
night flight call is a unique call that they give only when migrating at =
night.
The spectrogram of the night flight calls of some species are very hard =
to distinguish from related species. Therefore it is not possible to =
make identifications with the same certainty as with visual =
identification of a bird. With experience, one can say that there is a =
=E2=80=9Chigh probability=E2=80=9D that a particular night flight call =
was made by a particular species. Thus the results reported below should =
be seen as a list of probable species detected with an indication of the =
intensity of their migration by the number of flight calls detected.
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Nocturnal Migration Summary for August 11-17, 2014 over Amherst, =
Cumberland County, Nova Scotia
=20
Species
Calls
American Redstart
121
Yellow Warbler
63
Chestnut-sided Warblers
58
Magnolia Warbler
34
Unidentified Warblers
32
Canada Warbler
28
Black-and-White Warbler
27
Cape May Warbler
26
Unidentified Genus Setophaga
23
Least Sandpiper
21
Ovenbird
20
Bay-breasted Warbler
15
Norther Waterthrush
12
Golden-crowned Kinglet
7
Black-throated Green Warbler
6
Unidentified Songbirds
4
Prairie Warbler
4
Unidentified Birds
4
Northern Parula
2
Blackburnian Warbler
1
Blackpoll Warbler
1
Chipping Sparrow
1
Unidentified Sparrows
1
Killdeer
1
Savannah Sparrow
1
Wilson's Warbler
1
Yellow-rumped Warbler
1
Total
515
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