Fig 1.
Structure results comparing K = 2 to K = 7 for haploid samples of Sphagnum magellanicum.
The number of genetic clusters (K) are given to the left of the barplots, while the regions the samples are collected in are above the first barplot and divided by black lines. Abbreviations: WNA-western North America, CR-Central Russia, ENA-eastern North America, SA-South America.
Fig 2.
Geographical distribution of genetic groups inferred by the software Structure for all samples of haploid Sphagnum magellanicum (below, colours as in Fig 1) and all samples of diploid S. magellanicum and S. alaskense (above).
Genetic groups in the haploid plants differ in their total geographical distributions, but no spatial structure was found for diploid plants.
Fig 3.
Principal coordinate analysis based on microsatellite loci of six groups of haploid Sphagnum magellanicum divided in geographical regions.
Coloured symbols in the upper left corner show geographical origin of the samples and the coloured lines correspond to different genetic groups inferred by Structure (same colours as used in Fig 2 lower map). The dots that are not enclosed are admixed between different genetic groups.
Table 1.
Genetic diversity indices for haploid S. magellanicum.
Table 2.
Genetic diversity indices for genetic groups inferred by Structure in haploid S. magellanicum.
Table 3.
Nei’s genetic distance (below diagonal) and FST (above diagonal, significant values in bold) for pairs of genetic groups inferred by the software Structure for haploid S. magellanicum.
Fig 4.
Structure results comparing K = 2 to K = 4 for diploid samples of diploid Sphagnum magellanicum and S. alaskense (colours as in Fig 2).
The number of genetic clusters (K) are given to the left of the barplots.
Fig 5.
Maximum likelihood tree based on chloroplast DNA marker trnL for a subset of Sphagnum magellanicum (both haploids and diploids) and S. alaskense samples representing all genetic groups inferred by the software Structure.
The different genetic groups are indicated with colours corresponding to the ones used in Fig 2 (both maps). Another species from the subgenus Sphagnum, S. austinii, was used to root the tree.
Fig 6.
Genealogical relationships based on chloroplast DNA marker trnL for a subset of S. magellanicum and S. alaskense samples.
The size of the ovals are proportional to haplotype frequencies. The number of plants are given in each oval for each genetic groups (inferred by Structure based on microsatellites) of haploid plants and for diploid plants (S. alaskense and diploid S. magellanicum). Lines and dots indicate one mutational change, and dots represent unsampled haplotypes.