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CrepuscularMarch 5th, 2013, 2:54 pm
Boiling Springs, PA

Posts: 919
Just a few cases on this rock
EntomanMarch 5th, 2013, 3:16 pm
Northern CA & ID

Posts: 2604
Man, that's a healthy population! Psilotreta (Dark Blue Sedge)?
"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
FalsiflyMarch 5th, 2013, 3:22 pm
Hayward, WI.

Posts: 656
Any thoughts on what appears to be a somewhat organized pattern?
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
EntomanMarch 5th, 2013, 3:46 pm
Northern CA & ID

Posts: 2604
Each specimen optimizing flow velocity creating a group pattern that tracks the laminar flow like smoke in a wind tunnel?
"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
FalsiflyMarch 5th, 2013, 4:35 pm
Hayward, WI.

Posts: 656
Each specimen optimizing flow velocity creating a group pattern that tracks the laminar flow like smoke in a wind tunnel?

I donít know Kurt. I can only associate that with vortex generators placed on the cambered surface of high performance airfoils to promote laminar flow, reducing drag and delaying airflow separation in stall progression. Would there be an advantage in streamlining the flow of nutrients to the larva? Iím not familiar with how they feed.
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
SayfuMarch 5th, 2013, 4:43 pm
Posts: 560
As a real novice at aquatic bug ID'n my guess would have been dicosmoecis given the bigger rock inclusions. But I also have never seen them that tightly grouped.
EntomanMarch 5th, 2013, 5:17 pm
Northern CA & ID

Posts: 2604
Alan - They are grazers not filter feeders, so their concern for proper flows would have more to do with oxygen delivery. They would be more random and less concentrated if feeding so I assume the behavior in the photo is related to orientation for pupation? Creno will know.

Sayfu - Yes, Dicosmoecus (October Caddis) was my first impression as well but that's just our western bias kicking in.:) PA doesn't have them. These cases are much smaller and wider for their length compared to our critter.

Edit: The larvae are green as well.
"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
LastchanceMarch 5th, 2013, 5:31 pm
Portage, PA

Posts: 437
Each specimen optimizing flow velocity creating a group pattern that tracks the laminar flow like smoke in a wind tunnel?


Wow! I don't know what you said, but it sure sounds intelligent. I'm staying away from that laminar flow. It sounds dangerous. HA!HA!
EntomanMarch 5th, 2013, 7:48 pm
Northern CA & ID

Posts: 2604
Wow! I don't know what you said, but it sure sounds intelligent.

I'm not sure I know either, Bruce. But it does sound good, doesn't it...:)

Perhaps I used Laminar inappropriately, Alan. I'm talking about the flow of water over the rock and each organism's attempts to adapt to the changes in it caused by the others.
"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
FalsiflyMarch 5th, 2013, 8:07 pm
Hayward, WI.

Posts: 656
I'm talking about the flow of water over the rock and each organisms attemts to adapt to the changes in it caused by the others.

Ok Kurt, now things are making a little more sense. It would have been helpful for our discussion had the rock's position, relative to the current flow direction, been known. Yes?
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
EntomanMarch 5th, 2013, 8:15 pm
Northern CA & ID

Posts: 2604
Yes. I'm assuming the rock was caddis up and they were on the back side? If the caddis were under the rock (as when they are feeding and living normally), I would expect them to be much less concentrated to allow for grazing room.
"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
CrepuscularMarch 5th, 2013, 8:20 pm
Boiling Springs, PA

Posts: 919

It would have been helpful for our discussion had the rock's position, relative to the current flow direction, been known. Yes?


Downstream side of the rock. There were a bunch of rocks like that and they were all positioned the same way. I'm sure that Creno can elucidate why they do that. My guess would be that since they don't need to feed, the most protected position on the substrate would be the downstream side. But like you described earlier, they would still be able to get plenty of oxygen.
MartinlfMarch 5th, 2013, 8:26 pm
Moderator
Palmyra PA

Posts: 2957
I believe this is actually the site of a mosh pit at a caddis rave. Had Eric put his ear very close to the rock before removing it from the stream he most likely would have heard the sound of electric guitars. In a few minutes the larvae surfing would have begun.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
FalsiflyMarch 5th, 2013, 8:37 pm
Hayward, WI.

Posts: 656
Ha, good one Louis.
Falsifly
When asked what I just caught that monster on I showed him. He put on his magnifiers and said, "I can't believe they can see that."
EntomanMarch 5th, 2013, 8:39 pm
Northern CA & ID

Posts: 2604
LOL!
"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
CrenoMarch 5th, 2013, 9:42 pm
Grants Pass, OR

Posts: 298
a mosh pit ain't far off. They are pupal cases so they are not feeding. Just like any other bug we have no idea what they are doing - we just make up stuff about what we think they are doing. Folks think aggregate pupation is a predator avoidance mechanism. The predator has to find the right rock and when it does it is quickly sated by the mosh and the majority survive. Same rationale put forth for some schooling fish. But who knows - there sure are alot more taxa out here that don't do this and seem to get along just fine.

What I find interesting in taxa that do this is that they often pick the largest substrate around - they don't like their rock & roll. When I am collecting I always start with the large rocks/sticks/etc. That is usually where the most taxa are. What I don't understand is how they find the largest substrate around and how do they know when they have found it? Fascinating stuff.
CrepuscularMarch 6th, 2013, 9:14 am
Boiling Springs, PA

Posts: 919
Man, that's a healthy population! Psilotreta (Dark Blue Sedge)?


I'm pretty sure these are Neophylax.


Feathers5March 6th, 2013, 9:53 am
Posts: 287
I believe this is actually the site of a mosh pit at a caddis rave. Had Eric put his ear very close to the rock before removing it from the stream he most likely would have heard the sound of electric guitars. In a few minutes the larvae surfing would have begun.


I thing they were gathering for the Harlem Shake.
OldredbarnMarch 6th, 2013, 12:43 pm
Novi, MI

Posts: 2599
Location, location, location! ;)
"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
EntomanMarch 6th, 2013, 5:33 pm
Northern CA & ID

Posts: 2604
I'm pretty sure these are Neophylax.

Yep, your latest photos are great and show this unmistakably. Whew... Psilotreta's repution is in tact. I didn't think they were into such unbecoming behavior as mosh pits...:)
"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
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