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In a fig-fig wasp symbiosis, we have discovered that male fig pollinators (Alfonsiella fimbriata Waterston) bite into the dehiscent anthers of Ficus natalensis leprieuri Miq., thus scattering the pollen grains throughout the syconium. Female pollinators are the only ones to transfer pollen to conspecific trees, and collect pollen actively from the anthers only. Thus, this male behaviour appears to be antagonistic to the pollination process. We compare different wasp pollinating behaviours between fig species exhibiting dehiscent and non-dehiscent anthers and conclude that this male behaviour is new and not required with spontaneously dehiscent anthers. These findings could suggest a host shift of Alfonsiella fimbriata.

Pollen waste and unrelated traits in a fig–fig wasp symbiosis: a new behaviour suggesting a host shift