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INCREASED VOCAL DISCRIMINATION BY LEARNING IN SYMPATRY IN TWO SPECIES OF CHAFFINCHES by ALEJANDRO LYNCH and ALLAN J. BAKER1)2) (Department of Zoology, University of Toronto, Toronto, Ontario, Canada M5S 1A1) (With 3 Figures) (Acc. 30-VII-1990) Introduction Theories of allopatric speciation postulate several different mechanisms for the origin of reproductive isolation. DOBZHANSKY (1951) argued that postmating barriers to interbreeding arise as by-products of differentia- tion in isolated populations, with premating isolating mechanisms originating when and if the two populations come in contact. MAYR (1959) suggested that most of genetic divergence underlying isolating mechanisms arises as an incidental by-product of differentiation in isola- tion (for example, by pleiotropic effect; MULLER, 1940), and thus largely discounted the importance of reinforcement. PATERSON (1980, 1981, 1985) maintained that reproductive isolation arises in allopatry as a con- sequence of selection within populations for "specific-mate recognition systems", not selection for mechanisms preventing interbreeding among populations (VERRELL, 1988). The crucial distinctions between these competing theories therefore reside in the mechanisms of divergence in allopatry and the importance of reinforcement after secondary contact. Songs have long been postulated to function as premating isolating mechanisms (e.g. MAYR, 1963; MILLER, 1982), with perhaps the most 1) Department of Ornithology, Royal
Behaviour – Brill
Published: Jan 1, 1991
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