Sexual selection and mate recognition
Across species, there is a tight relationship between the number of teeth in the file and the pulse rate of the call at 25 C. Dotted line depicts combinations that would strike 2500 teeth per second.
In O. arentinus (center) the peak of the female response function (solid green line) matches the mean of the male trait distribution (individual males represented by individual dots).
In Rennselaerville, NY, O. nigricornis (black line, females, black dots males) has the fastest pulse rate of the continuously callingi tree crickets. In this case, females respond to the mean male trait, but are also responsive to pulse rates that exceed the mean. This could represent a case where preference for fast pulse rates increases the probability of conspecific mating (mate recognition) and obtains males in superior conditions.
David Ringelberg (Cold Regions Research Lab): GCMS analysis