Song Peaks

by Carl Strang

My block count data allow me to look at when different kinds of singing insects are most active. I note the time of day for each count, and this year categorized four years’ counts with respect to number of hours before or after sunset.

Two-spotted tree crickets sang the most in the hour after sunset, then continued intermittently through the night.

Sample sizes were 1 count 5-6 hours before sunset, 3 counts 4-5 hours before sunset, 9 counts 3-4 hours before sunset, 13 counts 2-3 hours before sunset, 20 counts 1-2 hours before sunset, 29 counts 0-1 hour before sunset, 61 counts 0-1 hour after sunset, 59 counts 1-2 hours after sunset, 23 counts 2-3 hours after sunset, and 11 counts 3-4 hours after sunset. Some of these sample sizes are small enough to consider the results as tentative (especially for cicadas, which sing before sunset), but on the whole they seem to reflect my more general observations of activity peaks in DuPage County.

Snowy tree crickets peaked 2-3 hours after sunset. Some tree crickets like to nibble on human skin, given the chance.

I found the following peak singing times:  4-5 hours before sunset for Linne’s cicada, 1-2 hours before sunset for the dog day cicada, 0-1 hour after sunset for jumping bush cricket and two-spotted tree cricket, 1-2 hours after sunset for fall field cricket, snowy tree cricket, common true katydid and greater anglewing, 2-3 hours after sunset for striped ground cricket and Carolina ground cricket, and 3-4 hours after sunset for narrow-winged tree cricket.

Narrow-winged tree crickets showed the latest singing peak in my neighborhood, 3-4 hours after sunset.

One particular bias to keep in mind is that some loud singers may drown out others, reducing their counts. For instance, ground crickets are singing at the times when cicadas are active, but I can’t hear them above the cicadas’ loud drones.

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