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Post by exoticimports on Aug 3, 2021 14:45:47 GMT -8
Thanks Chuck, I don’t think I have read this before. Will try to get to it when I have time. Very poor year for tigers in my region and for some reason the rest of my MST pupae have not developed. They are still alive though. Very strange. Factors affecting dipause 2017 www.theryanlab.com/uploads/1/7/2/1/17211134/ryan_et_al-2017-insect_science.pdf also added to page 2. I have papers on genetics of glaucus v. canadensis and both v. appalachiensis, but nothing on the all-yellow form in the hybrid zone. And for the life of me, I can't figure out why nobody at Cornell has bothered to figure out what they have there! FYI the last record in iNaturalist for 2021 (thus far) for MST/Ithaca in Tompkins County is 05 July; all the more recent are glaucus.
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Post by eurytides on Aug 3, 2021 16:14:06 GMT -8
No, “obligate” doesn’t determine how long something takes to brake diapause. MST is definitely different than appalachiensis, even if it has a similar origin. MST has no black females and their larvae can use host plants appalachiensis have not been reported to use. We need some appalachiensis DNA to send to Chris Schmidt…
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Post by exoticimports on Aug 4, 2021 4:12:05 GMT -8
Post on new meadow updated with photos (scroll back a few posts.) Appreciate ID on the plant.
Chuck
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Post by eurytides on Aug 4, 2021 6:47:24 GMT -8
Started reading the speciation paper and realized I actually have read it before. They are the researchers who concluded appalachiensis is 3/4 canadensis.
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Post by exoticimports on Aug 5, 2021 4:40:48 GMT -8
Update for my records, and anyone who is interested:
04 Aug 21: returned to the hilltop field of Veronia (still awaiting confirmation of ID). Night temps about 60F, daytime 75F. Saw only two glaucus. Observed about 20 Papilio troilus, all female and damaged, though I did see two fresh males in the forest trails. Populations have dropped 80% plus since two weeks ago, which I attribute to cold and the severe storms.
Following, I went to the patch of yellow cup flowers (page 1 of this thread). Previous visits this year revealed no Tigers. On 04Aug though I observed two (beat) glaucus nectaring on the cup flowers. I should note that the patch of plants is in a depression, which is likely saturated, so about 50% of the plants are blackened and sick.
It is amazing (sadly) that populations can crash so hard. No idea what the impact will be for next year's brood.
Chuck
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Post by 58chevy on Aug 5, 2021 7:15:09 GMT -8
We had the worst freeze in decades this past winter in TX. It shut down the entire state's power grid for over a week. It seems to have had a big effect on the butterfly population also, because numbers appear to be way down compared to normal years. The spring brood was almost nonexistent and nothing much is flying now. I'm hoping for a big recovery next year.
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Post by exoticimports on Aug 5, 2021 14:47:31 GMT -8
It will be interesting to see what happens next year in Texas. I’d suspect rebound will be a couple years; not only were populations lost, but over a wide area so there won’t be backfilling of the vacuum by transients.
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Post by exoticimports on Aug 16, 2021 9:26:24 GMT -8
Hit the fields in Upstate NY Finger Lakes again.
The hilltop field with purple Ironweed is totally past blooming. Sighted zero glaucus, two troilus, and a few Speyeria.
Next stop, the yellow cup leaf flowers. Astonishingly, zero Tigers.
Finally, the benchmark thistle field. It's 97% gone to seed, a good week earlier than last year. Zero Tigers.
They are not totally gone, as I did see one fly across the road. But for all practical purposes, the high season for Tigers is over; this is roughly 10 days earlier than last year.
Probably (though not definitely) having an impact: last week was near 90F daytime, and very humid, with night lows around 80F, true summer days. It's now daytime highs of 75F and lows of 55F. I wasn't here last week to see what the Tigers were doing, since I was doing field work in KY. So I cannot say for certain if the population tailed off two weeks ago, or if it crashed; it should have continued for another two weeks.
Chuck
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Post by Paul K on Aug 16, 2021 9:36:42 GMT -8
No P.glaucus here either. I haven’t seen one since begin of June.
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Post by exoticimports on Aug 16, 2021 9:51:50 GMT -8
No P.glaucus here either. I haven’t seen one since begin of June. Interesting. Toronto population must not have gone to two broods as has ours. And it took 12 pages for me to catch that!
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Post by Paul K on Aug 16, 2021 17:30:04 GMT -8
No P.glaucus here either. I haven’t seen one since begin of June. Interesting. Toronto population must not have gone to two broods as has ours. And it took 12 pages for me to catch that! Actually there are two generation per year. About 40 km west of Toronto I always encounter P.glaucus in mid August, this year none.
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Post by Adam Cotton on Aug 17, 2021 2:52:41 GMT -8
Maybe this year they either emerged a little early or will emerge slightly late. If they were early I expect you would see some worn individuals.
Adam.
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Post by eurytides on Aug 17, 2021 16:42:10 GMT -8
Pretty bad year in my region as well.
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Post by trehopr1 on Aug 17, 2021 17:32:44 GMT -8
Eurytides, are you able to collect specimens of the Zebra, Spicebush, or Giant swallowtails in your area ?
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Post by eurytides on Aug 18, 2021 21:47:16 GMT -8
Eurytides, are you able to collect specimens of the Zebra, Spicebush, or Giant swallowtails in your area ? I have specimens of all three but only cresphontes is found in my current region. They range all the way north to Quebec, Canada. Spicebush swallowtails can be seen reliable in Toronto and southwest of that, but not really northeast of Toronto. Zebra swallowtails are extremely uncommon in Ontario. They are not resident. Strays are occasionally seen, last one being at Point Pelee NP in 2012.
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