Re: [cobirds] late warblers in CO

2022-12-04 Thread 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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> .
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Best,

Peter Burke

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Re: [cobirds] late warblers in CO

2022-12-02 Thread 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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> 
> .
>


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Willem van Vliet--

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Re: [cobirds] late warblers in CO

2022-12-02 Thread 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

2022-12-02 Thread 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
>
> --
> --
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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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