Weather radar records drastic drop in mayfly populations

At the beginning of each summer, mayfly larvae emerge from bodies of water and shed their skin to become full-fledged mayflies, similar to how caterpillars become butterflies. Then, all at once, a swarm of these insects simultaneously takes flight to reproduce, acting as an important component in the food chain for birds.

Researchers at the University of Oklahoma, the University of Notre Dame and Virginia Tech applied radar technology – the same used for meteorology – to quantify the number of mayflies that emerged annually from two different bodies of water: the Upper Mississippi River and the Western Lake Erie Basin. Their goal was to characterize the size of these swarms using the same technique a meteorologist would use to quantify the amount of precipitation that may fall from a cloud.

Pulling radar data from the two locations over a span of eight years, the research team estimated that up to 88 billion mayflies can swarm from each location annually. Although the initial study was only intended to quantify mayfly swarms, researchers found a more than 50% decrease in population from 2012 to 2019 in these two Midwestern water bodies. The next steps are to investigate whether declines like this are widespread, and what may be causing such reductions in the mass emergence of this species of mayfly.

The lead author is Phillip Stepanian, assistant research professor of civil and environmental engineering and earth sciences and an affiliated member of Notre Dame’s Environmental Change Initiative. Study co-authors are Jeffrey Kelly, professor of biology and director of the Plains Institute at OU; Jennifer Tank, the Ludmilla F., Stephen J., and Robert T. Galla Professor of Biological Sciences and director of ND-ECI; Sally A. Entrekin, associate professor of entomology at Virginia Tech; Djordje Mirkovic, research scientist at the National Oceanic and Atmospheric Administration; and Charlotte E. Wainwright, postdoctoral research associate of civil and environmental engineering and earth sciences at Notre Dame.

The research was supported by a National Science Foundation–Division of Emerging Frontiers grant and a NSF–Division of Graduate Education grant. The awards were presented to OU and Kelly is the principal investigator.

To read the full study, please visit https://www.pnas.org/content/early/2020/01/15/1913598117.


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