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Hi All,
Conditions were good this week for the return of most of the remaining
Neotropical migrants to their summer home in Atlantic Canada. The Maine
radars showed light to heavy movement at Caribou (the heaviest on 30 May)
and light to very heavy movement at Portland (the heaviest on 26 May).
However, the greatest influxes of birds into Nova Scotia did not occur on
the mornings of 27 May or 31 May as might be expected from the traffic seen
on radar. Rather these influxes were apparent on 26 May and 1 June in the
eBird records for Black-throated Green Warbler, Magnolia Warbler, Blackpoll
Warbler, American Redstart, and Common Yellowthroat; the five index species
I had chosen as late May migrant warblers. The Maine radars showed no to
light migration on the preceding nights. But wind analyses for these two
preceding days show light but steady southwest winds from New England to
Nova Scotia throughout the day and into the early part of the night. It
appears that birds, in their hurry to arrive on the breeding grounds, chose
to begin their flights during the daytime and were perhaps already past the
range of the Maine radars by evening. The highest peaks of these five index
species occurred on 1 June.
It is interesting to note that I stayed up late enough on 28 May to watch
the live radar in Maine. With live radar is possible to adjust the settings
so as to see the direction in which objects are travelling. So at Portland,
at around 11 pm, objects (probably birds) were travelling northeast. At
Caribou, they were going east, directly toward Nova Scotia.
At my acoustic station in Carleton, Yarmouth County, there were two peaks in
night flight calls; one on the night of 26 May, corresponding with very
heavy migration on the Portland radar, and 31 May, corresponding with the
proposed daytime departure of birds in New England. The acoustic records for
the week are summarized below.
I will continue to monitor migration into the 1st week of June and soon
produce a short summary of the spring migration.
John
Estimated
Call
Minimum
Species
Count
Individuals
Common Yellowthroat
11
8
Magnolia Warbler
12
8
Unidentified Warbler
6
6
Blackpoll Warbler
7
5
Unidentified Warbler Genus Setophaga
6
4
Blackburnian Warbler
3
3
American Redstart
2
2
Yellow Warbler
3
2
Black-throated Green Warbler
1
1
Nelson's Sparrow
1
1
Northern Parula
1
1
Ovenbird
1
1
Unidentified Songbird
1
1
Spotted Sandpiper
8
1
Unknown Bird
1
1
Total
64
45
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vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Hi =
All,<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>Conditions =
were good this week for the return of most of the remaining Neotropical =
migrants to their summer home in Atlantic Canada. The Maine radars =
showed light to heavy movement at Caribou (the heaviest on 30 May) and =
light to very heavy movement at Portland (the heaviest on 26 May). =
However, the greatest influxes of birds into Nova Scotia did not occur =
on the mornings of 27 May or 31 May as might be expected from the =
traffic seen on radar. Rather these influxes were apparent on 26 May and =
1 June in the eBird records for Black-throated Green Warbler, Magnolia =
Warbler, Blackpoll Warbler, American Redstart, and Common Yellowthroat; =
the five index species I had chosen as late May migrant warblers. The =
Maine radars showed no to light migration on the preceding nights. But =
wind analyses for these two preceding days show light but steady =
southwest winds from New England to Nova Scotia throughout the day and =
into the early part of the night. It appears that birds, in their hurry =
to arrive on the breeding grounds, chose to begin their flights during =
the daytime and were perhaps already past the range of the Maine radars =
by evening. The highest peaks of these five index species occurred on 1 =
June. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>It is =
interesting to note that I stayed up late enough on 28 May to watch the =
live radar in Maine. With live radar is possible to adjust the settings =
so as to see the direction in which objects are travelling. So at =
Portland, at around 11 pm, objects (probably birds) were travelling =
northeast. At Caribou, they were going east, directly toward Nova =
Scotia. <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>At my =
acoustic station in Carleton, Yarmouth County, there were two peaks in =
night flight calls; one on the night of 26 May, corresponding with very =
heavy migration on the Portland radar, and 31 May, corresponding with =
the proposed daytime departure of birds in New England. The acoustic =
records for the week are summarized b