Date: 7/1/25 10:04 am From: Peter H Yaukey via groups.io <pyaukey...> Subject: Re: [labird] Golden-cheeked Warblers overfly LA
Everyone-
Thanks for all the insights.
Erik- thanks for sharing that geolocator data, I had never worked with it directly, so it was good to see what it looks like before it is transformed into tracks. Were those bins of dates selected to gather dates with similar light signals together?
Bachman's- Some quick math. Eight tracks are shown turning south to pass through LA and farther east. That's about 13 percent of their fall migrants. Granted, that could be atypical, they may have just happened to be sampling during a year with more eastward movement than normal or lucked on a bunch of birds that follow that path. However, even if that was ten times the normal amount, and only 1.3% of the birds normally go east this far, with a population of 100,000 (PIF estimate), that would mean that 1300 GCWA pass through this area every fall (possibly twice that, if the PIF estimate is breeding season and we need to add HY birds...?). If such a volume has only produced six detections over the years, then by proportion a population of 100 Bachman's might be expected to have produced (100/1300)*6 = 0.46 detections. So, none seems realistic.
Hope I didn't make any stupid math mistakes on the fly...
Very simplified way of looking at it of course, but still intriguing...
________________________________
From: <labird...> <labird...> on behalf of Jack Rogers via groups.io <jack...>
Sent: Monday, June 30, 2025 12:42 PM
To: <zoiseaux...> <zoiseaux...>
Cc: LABIRD List <labird...>
Subject: Re: [labird] Golden-cheeked Warblers overfly LA
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Paul and all-
Notably, South Padre Island has 2 July records (07-06-2014, 07-17-2020).
Maybe something for Louisiana birders to target in an otherwise dreadfully
slow month for birding?
Jack
Jack Rogers
*Caesar Kleberg Wildlife Research Institute at Texas A & M University of
Kingsville*
*Kingsville, TX/Mt Pleasant, SC*
On Mon, Jun 30, 2025 at 12:28 PM Paul Conover via groups.io <zoiseaux=
<lusfiber.net...> wrote:
> Peter, Labird,
>
> In addition to the FL record, there have been other reports SE
> of the breeding grounds, including Galveston. While I wouldn't put it in
> my Next Ten list, I've always wondered if it's a rare but regular
> migrant. Migration seems to start by late June when almost no birder is
> out there. Last summer, I think it was, Dave Patton's trail cam at
> Peveto picked up a tantalizing late June BT Green/Golden-cheeked type
> warbler coming into the water feature, but the images just eluded ID.
>
> Paul Conover
>
>
> On 6/29/2025 7:34 AM, Peter H Yaukey via groups.io wrote:
> > LABirders:
> > I read a (to me) shocking geolocator paper yesterday that reported that
> many Golden-cheeked Warblers travel far east from their nesting areas
> before turning south in fall, many apparently traversing Louisiana. The
> paper states that 20% of the birds in the study sample migrated across the
> Gulf in fall, including some going as far east as peninsular Florida. Here
> are the tracks of the c. 12 (of their total of 61 migrants tracked w
> geolocators) that went transgulf or through Florida.
> >
> > [cid:a9bc4c85-0d14-493e-947a-ed00063f054b]
> > They had another map that gives stopover points. One of these is on the
> Chandeleurs. Has the LBRC considered whether a geolocator observation
> could constitute a first state record? The lead authors of the study are
> actually at LSU- perhaps they could provide information on the amount of
> precision in that stopover observation or the flyover tracks?
> > This is crazy!
> >
> > [cid:2624d6e2-9708-4bd0-bcc2-9a578f417bf3]
> >
> > [cid:cac7bd43-7edd-4d8b-ab89-93ebac7375e8]
> >
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