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Brazilian Journal of Genetics

versión impresa ISSN 0100-8455


Reproductive isolation between Anastrepha bistrigata and A. striata (Diptera, Tephritidae). Braz. J. Genet. [online]. 1997, vol.20, n.4 ISSN 0100-8455.

The reproductive isolation between two closely related species, Anastrepha bistrigata and A. striata, was studied in the laboratory. Interespecific copulation attempts were observed, but examination of the spermathecae showed that sperm transference did not occur, even after a prolonged period of contact between the mating pairs. These results indicate prezygotic isolation. The analysis of the hourly distribution of mating activities under laboratory conditions, here described for the first time for A. bistrigata, clearly showed differences for the two species, the activities being concentrated in the afternoon period for A. striata and in the morning for A. bistrigata

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