Strange Underwater Webbing

[forester]

I saw a bunch of this stuff in a creek yesterday. Saw quite a few places where it was obviously strung up like some sort of underwater "web". Some of the "nests" were fairly large. Anyone have any ideas?

[payslee]

My guess is that it's some kind of filamentous algae.

http://publications.gc.ca/collections/c ... 11-eng.pdf

But I'm not a stream ecologist so it wouldn't surprise me to be wrong.

-payslee