Re: [cobirds] late warblers in CO

[Peter Burke]

Dave,
As if you willed it, a Palm Warbler was reported from a private residence
in Boulder County this morning.

On Sat, Dec 3, 2022 at 8:34 PM DAVID A LEATHERMAN 
wrote:

> Two additions (hooded and bay-breasted) bring the total species of
> warblers in CO since November 1, 2022 to *23*.  That is pretty
> remarkable.  "Misses" (with a small "m") from the 2022 list would seem to
> be palm and blackburnian, as they have occurred more than once late in
> previous years.
>
> Dave Leatherman
> Fort Collins
>
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Best,

Peter Burke

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[cobirds] late warblers in CO

[DAVID A LEATHERMAN]

Two additions (hooded and bay-breasted) bring the total species of warblers in 
CO since November 1, 2022 to 23.  That is pretty remarkable.  "Misses" (with a 
small "m") from the 2022 list would seem to be palm and blackburnian, as they 
have occurred more than once late in previous years.

Dave Leatherman
Fort Collins

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Re: [cobirds] late warblers in CO

[Willem van Vliet]

Great questions!  Christiaan Both (Groningen University) has been examining
some of them. See, for example:
https://research.rug.nl/en/publications/climate-change-breeding-date-and-nestling-diet-how-temperature-di


Willem

On Fri, Dec 2, 2022 at 3:44 PM DAVID A LEATHERMAN 
wrote:

> Kudos to Lori Z. in Fort Collins for finding a very late Northern
> Waterthrush along the Poudre which was warbler species #19 on my draft list
> for CO since November 1, 2022.  Brandon and Tyler have added Cape May and
> American Redstart, respectively, for a total so far of 21.  People fluent
> in eBird archives can probably find a palm record for CO since November 1
> and I seem to recall a bay-breasted in nw CO (or was that October?).
>
> Whatever the total is, it's almost as good as what we get during the
> supposed "primetimes" of late May and September.  And I'd love to know the
> reason for the late flush of these individuals that "didn't get the memo"
> about when it's best to migrate.  Are they mostly first-time migrants (i.e.
> young born last summer) from late-starting first or second nests?  Are they
> just not wired correctly?  Are the late adults we see individuals that
> didn't nest at all, or that had failed nests, late nests, or what?  I was
> sent a NYT article that makes the case for various species of forest
> rodents that feed on forest tree seeds in Maine having different
> personalities.  Why not birds?  Are some birds simply procrastinators?  Are
> more late migrants these days surviving than would have been the case "in
> the old days" because current late autumn weather tends to be milder?  Do
> they pass on this timing to their offspring next summer?  Is a
> proliferation of urban plantings that support the kind of foods needed to
> pull off a late migration part of it?  Maybe it just *seems* like there
> are more late migrants because more of us are looking than used to be the
> case (see David Suddjian's recent graphs of increasing eBird checklists).
> Lots of questions begging answers.
>
> Dave Leatherman
> Fort Collins
>
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> 
> .
>


-- 
Willem van Vliet--

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Re: [cobirds] late warblers in CO

[Todd Deininger]

Palm Warbler, Nov 13, 2011 Boulder City

On Fri, Dec 2, 2022, 3:44 PM DAVID A LEATHERMAN 
wrote:

> Kudos to Lori Z. in Fort Collins for finding a very late Northern
> Waterthrush along the Poudre which was warbler species #19 on my draft list
> for CO since November 1, 2022.  Brandon and Tyler have added Cape May and
> American Redstart, respectively, for a total so far of 21.  People fluent
> in eBird archives can probably find a palm record for CO since November 1
> and I seem to recall a bay-breasted in nw CO (or was that October?).
>
> Whatever the total is, it's almost as good as what we get during the
> supposed "primetimes" of late May and September.  And I'd love to know the
> reason for the late flush of these individuals that "didn't get the memo"
> about when it's best to migrate.  Are they mostly first-time migrants (i.e.
> young born last summer) from late-starting first or second nests?  Are they
> just not wired correctly?  Are the late adults we see individuals that
> didn't nest at all, or that had failed nests, late nests, or what?  I was
> sent a NYT article that makes the case for various species of forest
> rodents that feed on forest tree seeds in Maine having different
> personalities.  Why not birds?  Are some birds simply procrastinators?  Are
> more late migrants these days surviving than would have been the case "in
> the old days" because current late autumn weather tends to be milder?  Do
> they pass on this timing to their offspring next summer?  Is a
> proliferation of urban plantings that support the kind of foods needed to
> pull off a late migration part of it?  Maybe it just *seems* like there
> are more late migrants because more of us are looking than used to be the
> case (see David Suddjian's recent graphs of increasing eBird checklists).
> Lots of questions begging answers.
>
> Dave Leatherman
> Fort Collins
>
> --
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> bird species and location in the subject line when appropriate
> * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/
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> 
> .
>

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Re: [cobirds] late warblers in CO

[Marty W]

 Thank you as always, Dave Leatherman! I (and so many) always love your
observations, photos, explanations & information, and especially (as here)
your musings & speculations (based as they are on science and an
experienced, open & inquiring mind)!! Always sharp & insightful.

Marty Wolf
NW CO Spgs

On Fri, Dec 2, 2022 at 10:44 PM DAVID A LEATHERMAN 
wrote:

> Kudos to Lori Z. in Fort Collins for finding a very late Northern
> Waterthrush along the Poudre which was warbler species #19 on my draft list
> for CO since November 1, 2022.  Brandon and Tyler have added Cape May and
> American Redstart, respectively, for a total so far of 21.  People fluent
> in eBird archives can probably find a palm record for CO since November 1
> and I seem to recall a bay-breasted in nw CO (or was that October?).
>
> Whatever the total is, it's almost as good as what we get during the
> supposed "primetimes" of late May and September.  And I'd love to know the
> reason for the late flush of these individuals that "didn't get the memo"
> about when it's best to migrate.  Are they mostly first-time migrants (i.e.
> young born last summer) from late-starting first or second nests?  Are they
> just not wired correctly?  Are the late adults we see individuals that
> didn't nest at all, or that had failed nests, late nests, or what?  I was
> sent a NYT article that makes the case for various species of forest
> rodents that feed on forest tree seeds in Maine having different
> personalities.  Why not birds?  Are some birds simply procrastinators?  Are
> more late migrants these days surviving than would have been the case "in
> the old days" because current late autumn weather tends to be milder?  Do
> they pass on this timing to their offspring next summer?  Is a
> proliferation of urban plantings that support the kind of foods needed to
> pull off a late migration part of it?  Maybe it just *seems* like there
> are more late migrants because more of us are looking than used to be the
> case (see David Suddjian's recent graphs of increasing eBird checklists).
> Lots of questions begging answers.
>
> Dave Leatherman
> Fort Collins
>
> --
> --
> You received this message because you are subscribed to the Google
> Groups "Colorado Birds" group.
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> * All posts should be signed with the poster's full name and city. Include
> bird species and location in the subject line when appropriate
> * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/
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> 
> .
>

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[cobirds] late warblers in CO

[DAVID A LEATHERMAN]

Kudos to Lori Z. in Fort Collins for finding a very late Northern Waterthrush 
along the Poudre which was warbler species #19 on my draft list for CO since 
November 1, 2022.  Brandon and Tyler have added Cape May and American Redstart, 
respectively, for a total so far of 21.  People fluent in eBird archives can 
probably find a palm record for CO since November 1 and I seem to recall a 
bay-breasted in nw CO (or was that October?).

Whatever the total is, it's almost as good as what we get during the supposed 
"primetimes" of late May and September.  And I'd love to know the reason for 
the late flush of these individuals that "didn't get the memo" about when it's 
best to migrate.  Are they mostly first-time migrants (i.e. young born last 
summer) from late-starting first or second nests?  Are they just not wired 
correctly?  Are the late adults we see individuals that didn't nest at all, or 
that had failed nests, late nests, or what?  I was sent a NYT article that 
makes the case for various species of forest rodents that feed on forest tree 
seeds in Maine having different personalities.  Why not birds?  Are some birds 
simply procrastinators?  Are more late migrants these days surviving than would 
have been the case "in the old days" because current late autumn weather tends 
to be milder?  Do they pass on this timing to their offspring next summer?  Is 
a proliferation of urban plantings that support the kind of foods needed to 
pull off a late migration part of it?  Maybe it just seems like there are more 
late migrants because more of us are looking than used to be the case (see 
David Suddjian's recent graphs of increasing eBird checklists).  Lots of 
questions begging answers.

Dave Leatherman
Fort Collins

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[cobirds] late warblers in CO

[DAVID A LEATHERMAN]

By my count, Colorado has hosted at least 19 species of warblers since November 
1st.  I probably missed one or two.  The list jotted down includes (in no 
particular order):

prothonotary
black-and-white
northern parula
yellow-rumped
chestnut-sided
yellow-throated
pine
Nashville
Townsend's
common yellowthroat
black-throated blue
ovenbird
blackpoll (not sure if this one was ever confirmed)
yellow
Tennessee
MacGillivray's
Wilson's
orange-crowned
northern waterthrush

I think the key foods involved are aphids, midges and suet.  Fruit on trees 
like juniper, Russian-olive, viburnums, mountain-ash and crabapple are probably 
also part of how these birds can cope with cold weather, fatten up and 
hopefully move on.

Any species I missed?  How many will brighten our Christmas Counts?

Dave Leatherman
Fort Collins

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