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Stream-dwelling fungal decomposer communities along a gradient of eutrophication unraveled by 454 pyrosequencing

Fungal Diversity 2015年第1期70卷 127-148页

作者： S.Duarte F.Bärlocher j.trabulo F.Cássio C.Pascoal Centre of Molecular and Environmental Biology(CBMA) Department of BiologyUniversity of MinhoCampus de Gualtar4710-057 BragaPortugal Department of Biology Mount Allison UniversitySackvilleNB E4L 1G7Canada

Microbial decomposers,especially a fungal group called aquatic hyphomycetes,play a critical role in processing plant litter in freshwaters by increasing its palatability to invertebrate ***,communities of aquatic hyphomycetes have been assessed through the identification of spores,which misses non-sporulating *** new technologies,454 pyrosequencing stands out as most promising for large-scale species ***,very few attempts have been made to validate its effectiveness for assessing the diversity of stream-dwelling fungal *** attempted to gain greater insight into the diversity of aquatic fungal communities in streams exposed to various degrees of eutrophication by using the 454 pyrosequencing technology.A total of 173,889 ITS2 pyrosequencing reads with hits for fungi were obtained from the 5 investigated *** majority of operational taxonomic units(OTUs)belonged to Ascomycota and the identification to the genus level was achieved for 169 *** the total,135,257 reads(ca.78%)showed close affinities to aquatic hyphomycete *** showed declining fungal diversity in the most eutrophic streams,which was congruent with a reduced diversity found through spore *** patterns revealed by connecting representative OTUs to ITS sequences from aquatic hyphomycetes were similar to those determined by traditional spore identification ***,454 pyrosequencing provided a more comprehensive view of fungal diversity;it captured almost twice as many taxa as spore *** study vali-dates the effectiveness of 454 pyrosequencing for surveying the diversity of stream-dwelling fungal decomposer *** application may accelerate the use of these communities for monitoring the integrity of freshwaters.

关键词： Freshwater ecosystems Plant litter decomposition Aquatic fungi ITS region

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