Lateralized courtship in a parasitic wasp

Area of Science:

• Behavioral ecology
• Ethology
• Neuroethology

Background:

• Lateralization, or left-right asymmetries in brain and behavior, is well-documented in vertebrates.
• Evidence for lateralization in invertebrate courtship displays remains limited, highlighting a gap in comparative behavioral studies.

Purpose of the Study:

• To investigate behavioral lateralization in courtship and mating displays of the parasitic wasp Leptomastidea abnormis.
• To determine if male courtship acts exhibit population-level asymmetries and their relation to mating success.

Main Methods:

• Observational study of male Leptomastidea abnormis during courtship and mating.
• Quantification and analysis of specific courtship behaviors, focusing on antennal tapping lateralization.
• Statistical analysis to correlate display lateralization with mating success.

Main Results:

• A population-level right-biased lateralization was observed in male courtship displays.
• Male antennal tapping on the female's head showed a right-bias.
• Right-biased courtship acts were not directly linked to increased antennal tapping frequency or mating success, though higher frequency correlated with success.

Conclusions:

• This research provides the first report of behavioral lateralization in parasitic Hymenoptera.
• The findings contribute fundamental knowledge to the behavioral ecology of insect parasitoids.
• Demonstrates lateralization in a non-vertebrate species, broadening the scope of comparative lateralization research.