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Hybrid zones provide an ideal natural experiment to study the selective forces driving evolution of reproductive barriers and speciation. If hybrid offspring are less fit than the parental species, pre-zygotic isolating barriers can evolve and strengthen in response to selection against the hybrids (reinforcement). Four contact zones between the intertidal macroalgae  Fucus serratus  ( Fs ) and  Fucus distichus  ( Fd ), characterized by varying times of sympatry and order of species introduction provide an opportunity to investigate reinforcement. We examined patterns of hybridization and reproductive isolation between  Fs  and  Fd  in: (i) northern Norway (consisting of two natural sites, 10 000 years old), (ii) the Kattegat near Denmark ( Fd  introduced, nineteenth century) and (iii) Iceland ( Fs  introduced, nineteenth century). Using 10 microsatellites and chloroplast DNA, we showed that hybridization and introgression decreased with increasing duration of sympatry. The two younger contact zones revealed 13 and 24% hybrids and several  F  1  individuals, in contrast to the older contact zone with 2–3% hybrids and an absence of  F  1 s. Cross-fertilization experiments revealed that the reduction in hybridization in the oldest zone is consistent with increased gametic incompatibility.

Pre-zygotic isolation in the macroalgal genusFucusfrom four contact zones spanning 100–10 000 years: a tale of reinforcement?