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CrenoDecember 12th, 2013, 3:46 pm
Grants Pass, OR

Posts: 305		No wonder there are so many. They don't wait around.

https://www.youtube.com/watch?feature=player_embedded&list=UUWIKyvubtVUwRLZkOda89rw&v=gtXX9J7iZQA

TaxonDecember 12th, 2013, 7:47 pm
Site Editor
Royse City, TX

Posts: 1350		Hi Dave-

That is an absolutely fascinating video. Thanks for sharing.

Most mayflies lay their eggs immediately after mating; the eggs then take anywhere from 10 days to many months to hatch. Cloeon cognatum is an exception. This species is ovoviviparous, which means that a mated female holds her eggs internally until embryonic development is complete (about 18 days), after which she lays them in water and they hatch immediately. This female was dropped onto the water surface moments before the video started. Video credit: David H. Funk


Incidentally, Cloeon cognatum, which has been reclassified as Cloeon dipterum, is not the only ovoviviparous N. American mayfly species, as the (11) N. American species of Callibaetis also share the trait of gravid females holding their eggs internally until embryonic development is complete.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
MartinlfDecember 12th, 2013, 7:57 pm
Moderator
Palmyra PA

Posts: 3233		Wow!
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
CrepuscularDecember 12th, 2013, 9:14 pm
Boiling Springs, PA

Posts: 923		Thanks Dave! Very cool stuff. Hope you are doing well.
PaulRobertsDecember 13th, 2013, 12:20 am
Colorado

Posts: 1776		Very cool. Technology is just amazing. We get to see such wondrous things.

The hatch rate was very high with those. Looked like the little ones are programmed to disperse, and presumably end up in cover along shorelines.

Thanks for that, Dave!
TaxonDecember 13th, 2013, 2:00 am
Site Editor
Royse City, TX

Posts: 1350		Mack-

Does anybody reading along know if the time frame here is relative to all mayflies ???


I believe the only ovoviviparous N. American mayfly genera to be Callibaetis and Cloeon. Please see my post above. :-)
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TaxonDecember 13th, 2013, 2:17 am
Site Editor
Royse City, TX

Posts: 1350		Hi Mack-

I share your excitement. It's one thing to read about, but quite another to actually see it happening in a video. As Louis said, Wow!
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
CrepuscularDecember 13th, 2013, 7:49 am
Boiling Springs, PA

Posts: 923
This video led me to another from stroud research on DR. Ruth Patrick.


Stroud is a cool place. Having spent some time there for trainings, and as a guest, I would encourage anyone who can to pay them a visit. I'm lucky it's only about an hour and a half from me. I also have some colleagues who worked there. Everyone that I have worked with has been super knowledgeable and talented individuals. Dr. David Funk is an excellent photographer and has done some really cool mayfly work. http://www.stroudcenter.org/about/funk.shtm
LastchanceDecember 14th, 2013, 10:17 am
Portage, PA

Posts: 437		Awesome video. That's the first time I've ever seen anything like it. From what I've read this is a member of the baetis family? Was this found in the US? I read that it is a UK bug. Please enlighten me.
TaxonDecember 14th, 2013, 1:32 pm
Site Editor
Royse City, TX

Posts: 1350		Hi Bruce,

From what I've read this is a member of the baetis family?

It is a member of family Baetidae.

Was this found in the US? I read that it is a UK bug. Please enlighten me.

Don't know, but have emailed Dr. Funk in order to ask, and will share his response.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
TaxonDecember 15th, 2013, 11:32 am
Site Editor
Royse City, TX

Posts: 1350		This is the response received from Dr. David H. Funk in answer to the following question:

Was the video filmed in N. America, where my understanding is that Cloeon cognatum has been reclassified as Cloeon dipterum?

Video was shot in Pennsylvania. And yes, most people now consider cognatum a synonym of dipterum, but no one has officially sunk it and our North American populations fit the old world cognatum concept. Cloeon dipterum in the broader sense is native to Eurasia and is undoubtedly a complex of species. It is not native to North America, but probably came over on ships in the mid 20th century. I have "barcoded" our local population (using the mitochondrial COI gene) and it matches exactly a specimen collected in Bulgaria. This species is now very common in northeast North America, especially in fishless ponds.


Best regards,
Dave
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
PaulRobertsDecember 16th, 2013, 1:26 am
Colorado

Posts: 1776		Wow, again. Great thread.
EntomanDecember 18th, 2013, 5:19 am
Northern CA & ID

Posts: 2604		An invasive species of mayfly? New one on me! Thanks, Roger.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
TNEALDecember 22nd, 2013, 12:34 pm
GRAYLING. MICHIGAN

Posts: 278		maybe they'll eat the invasive species of Asian carp about to decimate great lakes fishery.......

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