The same probably holds true in streams they inhabit.Channelization would
probably be a cause for decline. Shallow wide runs of the streams seem to be
preferred habitat, with the same cover as the lake habitat I described.
One lake in particular was hit by drought-in-the end of the 80's. Before
that diapanous were everywhere. This was a glacial pot hole lake, and the
low water drained the shallow wide area around the edge of this lake, making
it into a steep sided lake. When water levels came back in the mid 90's, so
did the diaphanous. This cycle repeated itself again after that.
Ray W.
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