Paul and others, There is no blanket "rule" to follow here, since it depends very much on what species you are talking about. Magnolia Warbler can be a very LATE spring migrant, and this was very pronounced this year. If you encountered the species up to and including about June10-15th, but not recorded thereafter, they should all be considered spring migrants and deleted from your atlas cards. American Redstart can also be an extremely late spring migrant, and I bet many atlassers encountered the species in early to mid-June -- and probably most were immature males -- that were almost certainly late spring migrants. On the other hand, Black-throated Greens have been singing on territory in many locations in central Halton County, for example, and are obviously on territory. Hope this helps. Alan Wormington, Leamington **************************************** On Mon, 7 Jul 2003 09:18:15 -0400 "Smith, Paul D" <PaulD.Smith@Stelco.CA> writes: > 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:theo@hera.med.utoronto.ca] > 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: > theo@hera.med.utoronto.ca > > 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 > > > onlypnp@aol.com > > > > > > > > > > > > > > > --- > > > Mark Cranford > > > ONTBIRDS Coordinator > > > Mississauga, Ontario > > > Mark.Cranford@ofo.ca > > > 905 279 9576 > > > Mark Cranford <mark.cranford@ofo.ca> > > > > > > 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 <theo@hera.med.utoronto.ca> > > 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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Nous respectons les demandes similaires qui > touchent la confidentialité des communications par courrier > électronique. > > > "Smith, Paul D" <PaulD.Smith@Stelco.CA> > > Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving > and joining the list. As well as general information and content > guidelines. > ________________________________________________________________ The best thing to hit the internet in years - Juno SpeedBand! Surf the web up to FIVE TIMES FASTER! Only $14.95/ month - visit www.juno.com to sign up today! Alan Wormington <wormington@juno.com> Visit http://www.ofo.ca/ontbirdsguide.htm for information on leaving and joining the list. As well as general information and content guidelines.