Hi USA-NPN,
Another year of Mayfly Watch has come to an end. Mayfly Watch is an effort to track the seasonal activity of mayflies along the Upper Mississippi River - when they emerge in swarms that can number in the millions, and also when they are not present.
This year, we had observations of emergences at two different sites, one in Minnesota and one in Wisconsin. Observers reported heavy emergences on July 7th and July 16th. We also had 412 "negative" observation records, where observers reported they looked for but did not see mayfly adults, subadults, and other activity. Thank you all for your efforts!
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