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oscillation of an anuran hybrid zone: morphological evidence spanning 50 years.the hybrid zone between the primarily forest-dwelling american toad, anaxyrus americanus, and the prairie-adapted canadian toad, a. hemiophrys, in southeastern manitoba is known to have shifted its position during the past 50 years. hybrid zones are areas of interbreeding between species and their movement across a landscape should reflect their underlying dynamics and environmental change. however, empirical demonstrations of hybrid zone movements over long periods of time are rare. this hybrid ...201223300785
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