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Rapid evolution of sexual signals in sympatric Calopteryx damselflies: reinforcement or `noisy-neighbour' ecological
 

Summary: Rapid evolution of sexual signals in sympatric Calopteryx
damselflies: reinforcement or `noisy-neighbour' ecological
character displacement?
S. P. MULLEN*, 1
& J. A. ANDRE´ S*1
*Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA
Department of Biology, University of Maryland, College Park, MD, USA
Introduction
Reinforcement, as originally proposed by Dobzhansky
(1937), is the increase in prezygotic reproductive isola-
tion between recently diverged, hybridizing species via
natural selection against the production of unfit off-
spring. This has been one of the most controversial ideas
in evolutionary biology because of the lack of good
examples from nature and prior views that it was
theoretically improbable. Coyne and Orr's (1989, 1997)
striking finding, however, that prezygotic isolation is
stronger among sympatric than allopatric taxa, in con-
trast to patterns of post-zygotic isolation, was compelling
enough to rejuvenate interest in the process of rein-

  

Source: Andrés, José - Department of Biology, University of Saskatchewan

 

Collections: Biology and Medicine