 identifying stream macroinvertebrates identifying stream macroinvertebrates helps us understand the health of our streams and also the biological community which in turn we can use to answer who is eating whom and other ecological questions the identification key here is specific to odonates dragonflies and damselflies as these are of most interest to our mercury study there are other field guides and keys out there here are a few that we have found helpful if there are other sources that you have used with great success submit a comment and let us know if you are looking for a resource and have not had any success finding anything submit a post to the forum our research community may be able to help   mercury in watersheds  