[NatureNS] Nocturnal migration for the 3rd Week of August

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From: "John Kearney" <j.f.kearney@gmail.com>
To: <naturens@chebucto.ns.ca>
Date: Sun, 1 Sep 2019 11:20:00 -0300
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Hi All,

I'm a week late in my report due to long processing times of nocturnal
recordings at Beaver River.

The density of nocturnal migration nearly doubled over the previous week.
Flight calls increased 81% to 3,724 and total estimated birds by 90% to
2,344. The most common migrant was Magnolia Warbler with an estimated 326
birds. Chestnut-sided Warblers were not far behind with 298 estimated birds.
The next five most common migrants were American Redstart (estimated 279
birds), Yellow Warbler (226), Black-and-white Warbler (201), Canada Warbler
(174), and Ovenbird (148). A total of 22 species of warblers were recorded
with Prairie Warbler being the rarest.

Shorebird migration was dominated by Spotted Sandpipers (estimated 27), with
a few Least Sandpipers (4) and Semipalmated Plovers (5). There was the
beginning of thrush migration with an estimated 4 birds each of Swainson's
Thrush and Veery. The only sparrows were an estimated 13 Savannah Sparrows.

The large numbers of Magnolia Warblers seemed early to me. However, when
checking eBird I found that the highest average count for this species is in
the 3rd week of August at 6.79 birds per checklist (counting only checklists
that reported Magnolia Warbler). The density of migrants was up 11% in total
night flight calls and 6% in total estimated birds from 2018. The Canada
Warbler was up 50% from last week and 31% from this week in 2018. A part of
this increase from last year is likely due to adjustments I've made to the
acoustic software for extracting warbler flight calls. The year, 2018, was
an eruption year for Red-breasted Nuthatches, and during this week last
year, an estimated 62 nuthatches were recorded. This year there were none.

 


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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif'>Hi =
All,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif'>I&#8217;m a =
week late in my report due to long processing times of nocturnal =
recordings at Beaver River.<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif;color:black'>T=
he density of nocturnal migration nearly doubled over the previous week. =
Flight calls increased 81% to 3,724 and total estimated birds by 90% to =
2,344. The most common migrant was Magnolia Warbler with an estimated =
326 birds. Chestnut-sided Warblers were not far behind with 298 =
estimated birds. The next five most common migrants were American =
Redstart (estimated 279 birds), Yellow Warbler (226), Black-and-white =
Warbler (201), Canada Warbler (174), and Ovenbird (148). A total of 22 =
species of warblers were recorded with Prairie Warbler being the =
rarest.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif;color:black'>S=
horebird migration was dominated by Spotted Sandpipers (estimated 27), =
with a few Least Sandpipers (4) and Semipalmated Plovers (5). There was =
the beginning of thrush migration with an estimated 4 birds each of =
Swainson&#8217;s Thrush and Veery. The only sparrows were an estimated =
13 Savannah Sparrows.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif;color:black'>T=
he large numbers of Magnolia Warblers seemed early to me. However, when =
checking eBird I found that the highest average count for this species =
is in the 3rd week of August at 6.79 birds per checklist (counting only =
checklists that reported Magnolia Warbler). The density of migrants was =
up 11% in total night flight calls and 6% in total estimated birds from =
2018. The Canada Warbler was up 50% from last week and 31% from this =
week in 2018. A part of this increase from last year is likely due to =
adjustments I&#8217;ve made to the acoustic software for extracting =
warbler flight calls. The year, 2018, was an eruption year for =
Red-breasted Nuthatches, and during this week last year, an estimated 62 =
nuthatches were recorded. This year there were none.</span><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></=
span></p><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Calibri",sans-serif'><o:p>&nbsp;</=
o:p></span></p></div></body></html>
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