Nivicolous myxomycetes of the Khibiny Mountains, Kola Peninsula, Russia
Erastova, Daria A.; Novozhilov, Yuri K.; Schnittler, Martin
Nivicolous myxomycetes were surveyed in the southern Khibiny Mountains (Kola peninsula) in June 2012 and 2013, working on a vegetation gradient from subalpine Betula-Sorbus forest to mountain tundra. We give an annotated checklist compiled from 666 specimens collected in 2012 and 2013 and 49 specimens registered in 1994 representing 32 taxa (28 species, 3 varieties, 1 form) from 8 genera and 5 families. We report 6 taxa as new for Russia. Half of the taxa were rare; only six species were abundant. The Chao 1 estimator indicates that our sampling effort was sufficient to recover all of the more common species in the whole studied area (94% of the species to be expected; Chao1 = 34.2±4.3). Similar figures were obtained for the subalpine Betula-Sorbus forest (80.5%; Chao 1 = 32.0±3.4) but we did not manage to sample exhaustively the alpine mountain tundra (50%; Chao 1 = 40.0±20.2). The Turing's factor estimates the completeness of this survey as 75%, the total number of expected species is 43. Species richness and diversity are rather higher in subalpine Betula-Sorbus forest (29 taxa, H' = 2.18) than in depauperated alpine mountain tundra (20 taxa, H' = 1.95). A comparison with the well studied nivicolous myxomycete biota of the Teberda State Biosphere Reserve (northwestern Caucasus) indicates a rather high similarity with myxomycete biota of the Khibiny Mts (Cs = 0.77, 26 shared taxa). This survey is the northernmost of a large-scale study of nivicolous myxomycete diversity throughout Eurasia.