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Thanks again to all who have contributed to this thread. There indeed =
seems to be a number of intriguing question about the behaviour of =
Swainson=E2=80=99s Thrushes. I very much appreciate your contribution, =
Lance, of the historical data from a variety of places. It adds much to =
this discussion and points to some possibly fruitful directions for =
inquiry. I would like to add one more point to your comments, namely, =
that I believe a network of acoustic monitoring stations across Nova =
Scotia would provide a wealth of information about the pattern of =
migration in Nova Scotia, both in general and for a very wide variety of =
species. I have taken the initial steps this year to establish such a =
network and I hope to obtain more support for this project in the =
future.
John
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Laviolette, Lance =
(EXP)
Sent: September-22-14 16:35
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] The Elusive Swainson's Thrush
=20
Hi John and Richard,
=20
I have a bit I can add on this subject. I had a look at the historical =
data I have from Brier Island that applies to an entire fall migration =
season. From that I can say that the peak number of Swainson=E2=80=99s =
Thrush on Brier Island is in late August. However, these birds are =
almost all very young so they would be local to the island (as Richard =
suggests) or at least not from too far away. The September part of the =
migration is interesting as it shows two peaks: A fairly steady =
migration during the first 10 days of the month, a drop in numbers =
during the next ten and then an increase almost back to the levels of =
the first 10 days.=20
=20
My hypothesis for your acoustic detections and this pattern is that =
Swainson=E2=80=99s Thrush in Nova Scotia stay close to their breeding =
grounds and then they probably simply pick up and leave the province =
quickly. The ones that don=E2=80=99t leave the province entirely show up =
in the southwest areas of the province but stay only briefly. Most Nova =
Scotia birds are gone by mid-September. I think this is a pattern =
that=E2=80=99s seen in many of Nova Scotia=E2=80=99s species. The second =
peak is probably birds from northwest of the province (perhaps from very =
far away) or perhaps from Newfoundland.
=20
I also have some access to historical data for other migration =
monitoring stations in Nova Scotia. The historical data for Amherst =
Point does not show the late August-early September peak for this =
species but does show the peak in the last ten days of September. The =
historical data for Bon Portage shows the double peak, though the second =
peak is in early October. As an aside, the peak for Swainson=E2=80=99s =
Thrush fall migration at the McGill Bird Observatory in Montreal is =
mid-September with no second peak.
=20
The current work of Dr. Taylor and his students at Acadia University =
using radio tagging should shed some light on the bird migration =
movements around Nova Scotia and the Gulf of Maine and of course, as =
miniaturization and technology continue to advance an even greater =
degree of precision may be obtained in the near future.=20
=20
All the best,
=20
Lance
=20
Lance Laviolette
Glen Robertson, Ontario
=20
=20
=20
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Richard Stern
Sent: Monday, September 22, 2014 7:00 AM
To: NatureNS
Subject: EXTERNAL: Re: [NatureNS] The Elusive Swainson's Thrush
=20
There was a freshly dead one on the deck of my cabin, by the coast at =
the western end of Brier Island, on Sept. 5. I assume it hit the side =
of the building. It was not banded. I don't know if it was a true =
migrant as they breed locally.=20
Richard Stern=20
Sternrichard@gmail.com
Sent from my Android device=20
On Sep 22, 2014 7:09 AM, "John Kearney" <john.kearney@ns.sympatico.ca> =
wrote:
Thanks James. Another coastal record.=20
John
Sent from my iPhone
On Sep 21, 2014, at 23:46, James Hirtle <jrhbirder@hotmail.com> wrote:
Hi John:
=20
Kevin Lantz and I had one at Marsh Road, Digby County on Sept. 20, 2014. =
=20
=20
James R. Hirtle
=20
_____ =20
From: john.kearney@ns.sympatico.ca
To: naturens@chebucto.ns.ca
Subject: RE: [NatureNS] The Elusive Swainson's Thrush
Date: Sun, 21 Sep 2014 11:20:27 -0300
Thanks Blake for your records. I have received a couple of comments and =
records from others offline. They too confirm the dearth of records for =
Swainson=E2=80=99s Thrush on the ground in early to mid-September, the =
peak of their autumn migration. I will continue to compile some records =
on this species and let you know if I learn anything. So far it does =
seem that most records are coastal.
John
=20
From: naturens-owner@chebucto.ns.ca =
[mailto:naturens-owner@chebucto.ns.ca] On Behalf Of Blake Maybank
Sent: September-20-14 09:24
To: naturens
Subject: Re: [NatureNS] The Elusive Swainson's Thrush
=20
Since 1988 I have encountered Swainson's Thrushes on only 5 occasions in =
Sept in Nova Scotia. =20
=3D 1 =3D Bon Portage Island Sep 2, 1991
=3D 1 =3D Seal Island Sep 4, 1992
=3D 1 =3D Seal Island Sep 5, 1993
=3D 1 =3D Lower Musquodoboit River Sep 21, 1996
=3D 3 =3D Seal Island Sep 5, 1998
The species is elusive indeed.
Blake
--=20
Blake Maybank <mailto:bmaybank@gmail.com>=20
White's Lake, Nova Scotia
My Blog: <http://blakemaybank.com> CSI: Life
Organiser, <http://tinyurl.com/naturetravel> Maritimes Nature Travel =
Club
Author, " <http://tinyurl.com/birdingns> Birding Sites of Nova Scotia
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