Olfactory eavesdropping by a competitively foraging stingless bee, Trigona spinipes

Area of Science:

• Animal behavior
• Chemical ecology
• Evolutionary biology

Background:

• Long-distance signals are vulnerable to eavesdropping, influencing communication evolution.
• Stingless bees may use olfactory eavesdropping to locate food sources exploited by competitors.
• Previous research questioned if stingless bees are attracted to interspecific competitor odor marks.

Purpose of the Study:

• To investigate if Trigona spinipes foragers detect and use odor marks from Melipona rufiventris.
• To understand the role of olfactory eavesdropping in resource competition between stingless bee species.

Main Methods:

• Observational studies on foraging behavior of Trigona spinipes and Melipona rufiventris.
• Experimental manipulation of odor marks at food sources to assess bee orientation and preference.
• Analysis of bee responses to conspecific and interspecific odor marks in different contexts.

Main Results:

• Trigona spinipes foragers detect and orient towards Melipona rufiventris odor marks.
• T. spinipes rapidly takes over food sources marked by M. rufiventris, displacing competitors.
• T. spinipes prefers M. rufiventris odor marks over conspecific marks at new food sites.
• Melipona rufiventris foragers avoid T. spinipes odor marks.

Conclusions:

• Olfactory eavesdropping by Trigona spinipes on Melipona rufiventris facilitates resource acquisition.
• This eavesdropping behavior may drive the evolution of cryptic communication in stingless bees.
• Potential implications for the evolution of shortened odor trails and functionally referential communication.