| repeated unidirectional introgression towards populus balsamifera in contact zones of exotic and native poplars. | as the evolutionary significance of hybridization is largely dictated by its extent beyond the first generation, we broadly surveyed patterns of introgression across a sympatric zone of two native poplars (populus balsamifera, populus deltoides) in quebec, canada within which european exotic populus nigra and its hybrids have been extensively planted since the 1800s. single nucleotide polymorphisms (snps) that appeared fixed within each species were characterized by dna-sequencing pools of pure ... | 2010 | 20002578 |