Peat mosses are a key functional group in peatlands, driving biogeochemical cycles, habitat development and changes in species composition. They are generally intolerant of calcium and magnesium bicarbonate, but some species are adapted to mineral-rich fens. A previous study found a coincidence between genetic variation and the ability to tolerate high pH/calcium levels in Sphagnum warnstorfii. Here we compare its microsatellite variation with that of two rarer calcium-tolerant species (Sphagnum subnitens, S.…
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