[NatureNS] Nocturnal Migration for the 4th Week of August

From: "John Kearney" <john.kearney@ns.sympatico.ca>
To: <naturens@chebucto.ns.ca>
Date: Thu, 1 Sep 2016 15:10:43 -0300
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Hi All,

Nocturnal migration at Carleton, Yarmouth County, was moderate to strong on
about half the nights in this ten-day period. There was a large flight the
night of 27-28 August with 300 calls recorded. Overall for the week, there
was a total 934 calls at a rate of 93 per night and an estimated minimum of
763 birds. With the beginnings of the Swainson's Thrush migration this week,
the percentage of warbler calls fell to 90% of the total. The most common
species were American Redstart (148 calls), Common Yellowthroat (92),
Northern Parula (84), Black-and-White Warbler (69), Magnolia Warbler (65),
and Swainson's Thrush (53). There were some good nights for Northern
Waterthrush, Black-throated Blue Warbler, and Cape May Warbler. The rare
bird for the week was a possible Yellow-throated Warbler. Its call is very
similar to Northern Parula but an analysis of its spectrogram better fit the
parameters for a Yellow-throated Warbler.

There was a good correlation of the birds recorded at Carleton and the
number of (bird) echoes on the weather radar at Caribou, Maine. This was
especially true on the night of 27-28 August when the Caribou radar showed a
density of 227 (bird) echoes per cubic kilometer. Graphic representations of
Carleton call counts and correlations with the Caribou radar can be found on
my website (http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html)
and a summary table for the week is below.

John

		
Estimated

	
Total

Minimum


Species

Calls

Individuals*


American Redstart

148

114


Common Yellowthroat

92

78


Northern Parula

84

68


Black-and-White Warbler

69

59


Magnolia Warbler

65

53


Unidentified Warbler

62

59


Swainson's Thrush

53

31


Ovenbird

46

40


Northern Waterthrush

45

31


Black-throated Blue Warbler

31

25


Black-throated Green Warbler

30

28


Unidentified Warbler Genus Setophaga

28

25


Yellow Warbler

27

25


Cape May Warbler

23

20


Chestnut-sided Warbler

20

16


Wilson's Warbler

16

14


Blackburnian Warbler

14

12


Bay-breasted Warbler

10

7


Blackpoll Warbler

8

8


Nashville Warbler

8

6


Yellow-rumped Warbler

7

6


Palm Warbler

6

4


Canada Warbler

5

5


Rose-breasted Grosbeak

4

2


Unidentified Songbird

3

3


Prairie Warbler

3

3


Tennessee Warbler

3

1


White-throated Sparrow

3

3


Yellow-throated Warbler

3

1


Black-capped Chickadee

2

2


Unidentified Sparrow

2

2


Lincoln's/Swamp Sparrow

2

2


Unidentified Warbler Genus Oreothlypis

2

2


Spotted Sandpiper

2

1


Veery

2

1


Bobolink

1

1


Unidentified Thrush

1

1


Hermit Thrush

1

1


Mourning Warbler

1

1


Savannah Sparrow

1

1


Song Sparrow

1

1


Total

934

763


* 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

		

 


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:106%;font-family:"Book =
Antiqua",serif'>Hi All,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:106%;font-family:"Book =
Antiqua",serif'>Nocturnal migration at Carleton, Yarmouth County, was =
moderate to strong on about half the nights in this ten-day period. =
There was a large flight the night of 27-28 August with 300 calls =
recorded. Overall for the week, there was a total 934 calls at a rate of =
93 per night and an estimated minimum of 763 birds. With the beginnings =
of the Swainson&#8217;s Thrush migration this week, the percentage of =
warbler calls fell to 90% of the total. The most common species were =
American Redstart (148 calls), Common Yellowthroat (92), Northern Parula =
(84), Black-and-White Warbler (69), Magnolia Warbler (65), and =
Swainson&#8217;s Thrush (53). There were some good nights for Northern =
Waterthrush, Black-throated Blue Warbler, and Cape May Warbler. The rare =
bird for the week was a possible Yellow-throated Warbler. Its call is =
very similar to Northern Parula but an analysis of its spectrogram =
better fit the parameters for a Yellow-throated =
Warbler.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;line-height:106%;font-family:"Book =
Antiqua",serif'>There was a good correlation of the birds recorded at =
Carleton and the number of (bird) echoes on the weather radar at =
Caribou, Maine. This was especially true on the night of 27-28 August =
when the Caribou radar showed a density of 227 (bird) echoes per cubic =
kilometer. Graphic representations of Carleton call counts and =
correlations with the Caribou radar can be found on my website (<a =
href=3D"http://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html">ht=
tp://www.johnfkearney.com/Carleton_YarmouthCounty_2016.html</a>) and a =
summary table fo