The Montana Standard has a great article titled, "Caddis Conundrum" which discusses the macroinvertebrate study performed by Morrison Maierle Inc. The study was commissioned by the Upper Missouri Watershed Alliance.
It sought to make baseline observations of the macroinvertebrate communities in the Missouri River below Holter Dam. In the past decade, the river has had significant ecological and structural changes which have manifested in a change in bug densities and communities.
I hope they'll get to continue this study in the long term because although these preliminary results are interesting, they mean nothing without observations over a longer time interval.
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