TY - JOUR T1 - Courtship Sound Production in Two Sympatric Sibling Drosophila Species JF - Science JO - Science SP - 191 LP - 193 DO - 10.1126/science.144.3615.191 VL - 144 IS - 3615 AU - Waldron, Ingrid Y1 - 1964/04/10 UR - http://science.sciencemag.org/content/144/3615/191.abstract N2 - Courting males of Drosophila persimilis produce a pulsed "vibration sound," with frequency of oscillation and pulse repetition rate markedly different from that of D. pseudoobscura. These differences probably contribute to reproductive isolation. Flight frequency is the same in both species. Brief "preliminary sounds" are common and the same in both species. Males with large parts of both wings removed produce nearly normal vibration sounds, and normal preliminary sounds. ER -