Chorus Frog diurnal monitoring hypothesis falsified! (for now)

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Fred Schueler

Apr 16, 2023, 9:49:17 PM4/16/23
to Eastern Ontario Natural History listserve, Aleta Karstad
here's what I just sent to my Chorus Frogger list:

Ever since the money for chorus frogging across southern Ontario came
late in the season in 2006, and we did the whole province south and west
of here without hearing any diurnal calling, I've been dubious about
diurnal monitoring as evidence that CF are absent from a site.

Today, at 25-27°C we drove the Temperance Lake, New Dublin, North
Augusta, Kyle, Bolton, Scotch Line, & Donaghue roads, and then Hwy 43
into Kemptville, and back along 43 to Actons Corners, and then home
along county roads 25 & 18. We had previously heard CF at dozens of
places along this route, but today we heard them only as a single
drive-by griick on the New Dublin Road, and a small chorus in the core
Bolton population at the foot of Hares Hill Road.

Of course it's possible that with the extreme heat and dryness the
calling season is ended, so we'll drive this route again when things are
wetter and cooler, and "see what we hear." At home here we've had, as we
did last year, a single calling male, and he just gave a couple of
nocturnal creaks.

Frederick W. Schueler & Aleta Karstad
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Stewart Hamill

Apr 17, 2023, 7:28:55 AM4/17/23
With the wet spring and lots of flooded puddles & fields, I've noted
Chorus Frogs calling in a lot of locations, some level 1 but many level
3 (for example in the Snowdons Corners - Carleys Corners area). There
seem to be a lot more this spring than other years, plus the Peepers are
very abundant also. It is difficult to do owl surveys with the loud
Peeper noise.

The Chorus Frog calling I've noted has been diurnal.

They're not doing the official Chorus Frog survey this year and I'm
therefore not doing any regulated surveys; my observations have been
mostly random drive-bys.


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