The diversity and distribution of mtDNA haplotypes in Atlantic salmon (Sulmo sulur L.) from 13 river systems across the species' European range was investigated. Salmon were screened by agarose electrophoresis for variation in a 1400 base pair fra
The distribution of genetic variation for NAD+ malic enzyme (ME*) polymorphism in the Atlantic salmon was assessed in both anadromous and resident populations. The analysis revealed a major allelic divergence between North America and Europe. The *80 variant occurred in 39 of 40 North American samples, ranging in frequency from 0 to 0·515. In contrast, it was detected in only three fish from two of the 35 European locations analysed. Eleven fish from two rivers in north-west France had the *110 variant. While heterogeneity among North American populations was significant, no regional differentiation was apparent and anadromous and resident salmon were not found to differ.
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