Message - 7th IAL Symposium

Lichen: from genome to ecosystem in a changing world
2B-P
(2B-P9) Submission ID: IAL0035-00002
EPIXILIC LICHEN SUCCESSION ON DEADFALL IN MOUNTAIN FORESTS
Kharpukhaeva T. M. 1
1 Laboratory of Floristic, IGEB SB RAS, Ulan-Ude, Buryatia Republic, Russia
Epixilic lichen succession was studied in Buryatia Republic (Russia) in conifer forests with Abies sibirica
Ledeb., Pinus sibirica Du Tour, Larix gmelinii Rupr. and Pinus sylvestris L. on Khamar-Daban and Ikatsky ranges
on 700 – 2,300 m above sea level. Deadwood was separated by origin: cutting and natural residue. 55 lichens
species were listed for deadwood on plots. Author found four lichen succession stages corresponding with wood
decaying stages. I stage of wood decay includes epiphytic (from live trees) fruticose lichens sinusia. Usnea
fragilescens, Usnea subfloridana, Bryoria furcellata, Tuckermanopsis ciliaris, Hypogymnia physodes, Evernia
mesomorpha, Evernia esorediosa occurred on bark. When xylotrophic fungi of Aphillophorales order appear, I
stage fast proceeds to II-III stages of decay. Lichens composition has low change with adding such species as:
Mycoblastus affinis, Vulpicida pinastri, Imshaugia aleurites, Parmeliopsis ambigua, Japewia tornoensis. II stage
of decay – bark peeled off, wood partly loses hardness, branches stay (Klimchenko, 2005) attend with epiphytic
lichens elimination, primary thalli of genus Cladonia species and an admixture of Lecanora saligna, L. symmicta,
Trapeliopsis granulosa appearing. Calicium species thalli are highly abundant on dry wood (C. denigratum, C.
trabinellum, C. glaucellum, C. lenticulare). Not all species are in contact; they do not form sinusia, rather are similar
to new succession. Crustose hygromesophylic species Micarea melaena, M. prasina, Bacidia subincompta,
and other, typical for moist decaying wood soon replacing competitive fruticose lichens with primary thalloma,
such as Cladonia digitata, C. macilenta, C. botrytes, C. deformis (III stage). At this point dense epixilic species
society forming, sinusia proper. In next stage species composition richness increasing as wood decomposition
finishes. IV stage wood decaying–wood lost structure, gone to dust. In this time on deadwood surface ground
layer accumulate, deadwood overgrown with mosses and fruticose lichens species, typical for soil appearing:
Cladonia amaurocraea, C. arbuscula, C. rangiferina, C. stellaris. Thus, epixylic lichens held to overall succession
pattern with full species replacement and ended with wood decaying. Deadwood, although relating their origin to
live trees, by substrate characters differ from the live phorophyte. The investigation was supported by Russian
Fund of Basic Research (grant 10-04-00337-а).
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