To find a host cricket, this parasitic fly listens to more than the beat
A pregnant female Ormia ochracea fly has a challenging problem to solve. She must listen for the song of a male cricket, locate him in the dark and use him as a host for her developing offspring.
New research in the Journal of Experimental Biology reveals that the parasitic fly Ormia ochracea evaluates cricket songs based on more than just the beat or pulse rate. These small, yellow, crepuscular flies with female Ormia ochracea implant their larvae in crickets as hosts for their offspring. Published in the Journal of Experimental Biology, the study reveals that female Ormia ochracea do not recognize attractive cricket songs based solely on their beat.
Instead, the flies evaluate multiple aspects of the songs' timing, particularly the variations in rhythm between sound pulses and periods of silence. Two songs with the same pulse rate can have dramatically different effects on the female fly. While pulse rate does predict some of the flies' behavior, it cannot fully explain their preferences.
Songs with identical pulse rates can trigger vastly different responses depending on the specific combination of sound and silence. This suggests that the flies use combinations of timing features to recognize suitable cricket hosts. The discovery highlights how the fly's nervous system integrates multiple pieces of information to make decisions about which sounds to pursue, even though their nervous systems are relatively simple.
The research also opens questions about how Ormia ochracea populations recognize different host cricket species with drastically different timing patterns. Ultimately, the study sheds light on the complex process by which nervous systems of all sizes turn complex sensory information into decisions about appropriate actions.
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