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My acoustic monitoring during last night at Doctor's Brook, Antigonish
County yielded the following results:
Number of calls (not necessarily the number of birds):
American Redstart-5
Northern Parula-4
Palm Warbler-2
Bay-breasted Warbler-1
Blackburnian Warbler-1
Black-throated Green Warbler-1
Northern Waterthrush-1
Swainson's Thrush-1
Timing of calls (hours after sunset)
0-1: 0
1-2: 1
2-3: 2
3-4: 0
4-5: 1
5-6: 3
6-7: 1
7-8: 8 (the last was recorded at 4:57 am with sunrise at 5:45 am)
I'm still learning the calls so these identifications are tentative. Some
species are not reliably separated even with experience. Nonetheless,
acoustic monitoring can give a fairly accurate sense of what birds are
migrating on a given night.
Anyone wishing to know more about the night flight calls of birds or are
interested in building their own inexpensive microphone should visit:
http://www.oldbird.org/
A useful and attractive poster on the night flight calls of warblers can be
found at: http://www.allaboutbirds.org/Page.aspx?pid=2229
Feel free to contact me if you have any questions.
John
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-CA link=3Dblue =
vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal>My =
acoustic monitoring during last night at Doctor’s Brook, =
Antigonish County yielded the following results:<o:p></o:p></p><p =
class=3DMsoNormal>Number of calls (not necessarily the number of =
birds):<o:p></o:p></p><p class=3DMsoNormal>American Redstart-5<span =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'> <span =
lang=3DEN-US><o:p></o:p></span></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Northern =
Parula-4<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Palm Warbler-2<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Bay-breasted =
Warbler-1<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Blackburnian =
Warbler-1<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Black-throated Green =
Warbler-1<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Northern =
Waterthrush-1<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Swainson’s =
Thrush-1<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'><o:p> </o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>Timing of calls (hours after =
sunset)<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>0-1: 0<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>1-2: 1<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>2-3: 2<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>3-4: 0<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>4-5: 1<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>5-6: 3<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>6-7: 1<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:"Comic Sans =
MS";mso-fareast-language:EN-CA'>7-8: 8 (the last was recorded at 4:57 am =
with sunrise at 5:45 am)<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-