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2014<o:p></o:p></span></p></div><
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John,
Based on past years of acoustic monitoring, Northern Parula peak in 1st two w=
eeks of September.
John
Sent from my iPhone
> On Aug 21, 2014, at 14:19, John and Nhung <nhungjohn@eastlink.ca> wrote:
>=20
> The relatively low frequency of parulas is interesting, too. Earlier in t=
he year, I heard them calling fairly often in various places down my way aro=
und Yarmouth. Are they early migrants?
> =20
> 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 A=
mherst, Nova Scotia. I will try to report results on a weekly basis to Natur=
eNS. This work is funded by Natural Forces Inc. and is part of an environmen=
tal assessment for a proposed wind energy facility. Since the acoustic work i=
s 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 rea=
ch of about 300 meters).
> =20
> As for this week results, most flight calls were the early migrating warbl=
ers. These are dominated by American Redstarts (121 calls) and Yellow Warble=
rs (63 calls). The number of Chestnut-sided Warblers (58 calls) is higher th=
an what I have experienced previously in Nova Scotia. There were also unusua=
lly 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 i=
s given below in order of the highest to lowest number of calls detected.
> =20
> At the beginning of this migration season, I wish to highlight some main f=
eatures 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 mo=
re 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 b=
y just listening to them. For many species their night flight call is a uniq=
ue 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 iden=
tifications 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. Th=
us the results reported below should be seen as a list of probable species d=
etected with an indication of the intensity of their migration by the number=
of flight calls detected.
> =20
> Nocturnal Migration Summary for August 11-17, 2014 over Amherst, Cumberlan=
d 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
> =20
> =20
> =20
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>John,</div><div>Based on past years of=
acoustic monitoring, Northern Parula peak in 1st two weeks of September.</d=
iv><div>John<br><br>Sent from my iPhone</div><div><br>On Aug 21, 2014, at 14=
:19, John and Nhung <<a href=3D"mailto:nhungjohn@eastlink.ca">nhungjohn@e=
astlink.ca</a>> wrote:<br><br></div><blockquote type=3D"cite"><div><meta h=
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oNormal"><span style=3D"font-size:11.0pt;font-family:"Calibri",&qu=
ot;sans-serif";color:#1F497D">The relatively low frequency of parulas i=
s interesting, too. Earlier in the year, I heard them calling fairly o=
ft