The singing question posed by Paul is an excellent one. Warblers and many other (but not all) species begin singing on their northward migration. Some even begin, I think, on their wintering grounds. My guess is that birds such as Tennessee W., which start south before their moult begins and which obviously have no young to feed are still hormonally disposed to sing. Tennessees,of course, sing incessantly in late spring migration, perhaps more than any other Parulid. The logical extension of this is that these early fall birds are also more inclined to sing than other species.
bob Bob Curry and Glenda Slessor 3115 New St. Unit 30 Burlington, ON Canada L7N 3T6 905-637-2022 [EMAIL PROTECTED] ----- Original Message ----- From: "Smith, Paul D" <[EMAIL PROTECTED]> To: "Ontbirds (E-mail)" <[email protected]> Cc: "Mike Cadman (E-mail)" <[EMAIL PROTECTED]> Sent: Monday, July 07, 2003 9:18 AM Subject: FW: late or early???? Tennessee Warbler - Toronto (fwd) > This may not be the right forum for this discussion but it raises a lot of > questions with respect to atlasing. Presumably this should be discussed > through the atlas website but (now that it's started) how common is early > southward migration for passerines? I've found singing Magnolia's in > Flamborough and a Black-throated Green in north Huron County in marginal > habitat. How do you tell the difference between northbound and southbound > migrants and legitimate southern breeders? If there is any hormonal control > of southward migration is it unexpected that they would still be singing on > their way south? Are these really southbound or just "stalled" migrants > still in a "singing" state of hormonal balance? > > Paul D. Smith > Flamborough > > -----Original Message----- > From: Theo Hofmann [mailto:[EMAIL PROTECTED] > Sent: Sunday, July 06, 2003 5:15 PM > To: message Ontbirds > Subject: Re: late or early???? Tennessee Warbler - Toronto (fwd) > > > > > I had a similar problem on Wednesday, 2 July with a Yellow-bellied > > Flycatcher in a forest south of Mt. Albert. It was singing vigorously, but > > clearly too far south and in habitat not suitable for breeding. Again, > > was this a very early migrant or a non-breeding male who never made it > > to where it ought to have been? > > > > Theo > > -------------------------------------------------------------------------- > > Theo Hofmann e-mail: [EMAIL PROTECTED] > > 199 Arnold Avenue > > Thornhill Ontario Phone: 905 889-1554 > > Canada L4J 1C1 Fax: 416 978-8548 > > > > On Fri, 4 Jul 2003, Mark Cranford wrote: > > > > > >From the technically challenged Paul Prior > > > > > > --part1_1cd.d14932c.2c372e25_boundary > > > Content-Type: text/plain; charset="US-ASCII" > > > Content-Transfer-Encoding: 7bit > > > > > > What was presumeably an early returning Tennessee warbler was in full > song at > > > about 8am this morning at the Toronto and Region Conservation office at > > > Shoreham Drive (east edge of the Black Creek ravine, just south of the > > > road). I > > > recall hearing singing Tennessees in the Toronto region in mid-July last > > > year ... > > > but 4th of July seems a little too early!!! Perhaps this individual came > > > through so late in June (heading north) that it simply gave up and > decided > > > to get > > > an early start on a leisurely trip south. A similar reasoning may > explain the > > > seeming glut of American redstarts that are hanging out in locations all > over > > > Toronto! > > > > > > Paul Prior > > > [EMAIL PROTECTED] > > > > > > > > > > > > > > > --- > > > Mark Cranford > > > ONTBIRDS Coordinator > > > Mississauga, Ontario > > > [EMAIL PROTECTED] > > > 905 279 9576 > > > Mark Cranford <[EMAIL PROTECTED]> > > > > > > Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving > > > and joining the list. As well as general information and content > > > guidelines. > > > > > > > > > > > > > Theo Hofmann <[EMAIL PROTECTED]> > > Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving > and joining the list. As well as general information and content > guidelines. > > > This email communication is intended as a private communication for the sole > use of the primary addressee and those individuals listed for copies in the > original message. The information contained in this email is private and > confidential and if you are not an intended recipient you are hereby > notified that copying, forwarding or other dissemination or distribution of > this communication by any means is prohibited. If you are not specifically > authorized to receive this email and if you believe that you received it in > error please notify the original sender immediately. 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As well as general information and content > guidelines. "Bob and Glenda" <[EMAIL PROTECTED]> Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving and joining the list. As well as general information and content guidelines.
