I study insects in an entomology lab at the University of Minnesota and we have had to get our spring emergence traps out a month earlier than we thought. This photo is of an emergence trap in a field at the U of Minnesota Rosemount Testing Station. We are interested in the ways that prairie plants (with potential for biofuel) can provide other benefits, such as habitat for insect predators to control insect pests. In the spring many insects will emerge from the ground, where they overwintered either as adults or as pupae or eggs, or even as larvae. These emergence traps will sample the emergence for a couple weeks, giving us a very strong and specific idea of the insects in these plots; we have very little understanding of the actual life histories of most insects, and overwintering is definitely a gap in our knowledge.
The bucket is nailed to the ground with 10-inch spikes; the bottom has a large hole cut into it where the funnel fits. Insects will emerge from the ground and fly or crawl toward the light, ending up in a small vial of propylene glycol which we will trade out every few days.
Minnesota weather is a good teacher of standard deviation: we always deviate quite strongly from the "norm." However, this early of a spring seems a bit frightening.
-Jonathan Dregni, St. Paul
(Photo by Joe Kaser, courtesy Jonathan Dregni)