Abstract
Abstract Genetic structure and diversity were studied in the endangered peatmoss Sphagnum angermanicum Melin to assess its conservation status. In total, 128 shoots from eleven populations throughout its Swedish distribution were analyzed. Among these shoots 28 haplotypes were identified by 19 ISSR loci. The most common haplotype (50% of the sampled shoots) occurred in all populations. The level of gene diversity over loci was intermediate compared to records from most other bryophytes. There was no genetic isolation between the populations and most of the genetic variation was found within populations. This implies either that the populations have originated from only a few common individuals or a high gene flow between populations. A relict population model is suggested to explain the observed pattern. Just after the last glaciation, S. angermanicum may have expanded its range when suitable habitat became available after the glacial ice retreated. Since then, habitats have vanished or fragmented and tod...
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