Protistology 6 (1) 24–32 (2009)
Protostelids of the “Stolby” State Reserve (Siberia, Eastern Sayan)
Alena P. Kosheleva1, Martin Schnittler2 and Yuri K. Novozhilov1
1 V.L. Komarov Botanical Institute of the Russian Academy of Sciences, St.Petersburg, Russia
This study presents the first survey of protostelids in the Russian Federation and the second one in boreal forests. Altogether, 158 cultures of protostelids were prepared, with samples taken from the bark surface of living trees, rotten bark of logs and decaying plant litter in 2005 and 2006. Samples were processed in 2008 and 2007, respectively. Storing the air-dried substrate samples for three years instead of one did not result in a loss of species, but extended development time of the fructifications for about 2 days. In total, 184 records representing 15 protostelid species from nine genera were made. As for most other surveys of protostelids, Protostelium mycophaga and Schizoplasmodiopsis pseudoendospora were found to be very abundant. However, bark of living trees, a substrate not studied in most other surveys of protostelids, yielded Protosporangium articulatum as the second most common species, occurring almost exclusively on this substrate type. In taiga communities, bark of coniferous trees was found to be the most productive substrate, whereas in steppe communities ground litter was more productive than bark. A comparison of 11 different regions where protostelid biota has been studied showed a high similarity of the regional species assemblages (average Cs=0.86) except for differences caused by the selection of different substrata.
Key words: ecology, distribution, epiphytic species, Eumycetozoa, forests, taiga, microhabitat, slime molds, spore longevity
Address for correspondence: Yuri K. Novozhilov, Komarov Botanical Institute of the Russian Academy of Sciences, 197376, St.Petersburg, Russia, e-mail: email@example.com
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