Nutrient Input Influences Fungal Community Composition And Size And Can Stimulate Mn(II) Oxidation In Caves

ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
Suzanna Brauer Ph.D., Associate Professor (Creator)
Sarah K. Carmichael Ph.D., Assistant Professor of Geology (Creator)
Bryan Thomas Zorn (Creator)
Appalachian State University (ASU )
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Abstract: Little is known about the fungal role in biogeochemical cycling in oligotrophic ecosystems. This study compared fungal communities and assessed the role of exogenous carbon on microbial community structure and function in two southern Appalachian caves: an anthropogenically impacted cave and a near-pristine cave. Due to carbon input from shallow soils, the anthropogenically impacted cave had an order of magnitude greater fungal and bacterial quantitative-PCR gene copy numbers, had significantly greater community diversity and was dominated by Ascomycota fungal phylotypes common in early phase, labile organic matter decomposition. Fungal assemblages in the near-pristine cave samples were dominated by Basidiomycota typically found in deeper soils (and/or in late phase, recalcitrant organic matter decomposition), suggesting more oligotrophic conditions. In situ carbon and Mn(II) addition over 10 weeks resulted in growth of fungal mycelia followed by increased Mn(II) oxidation. A before/after comparison of the fungal communities indicated that this enrichment increased the quantity of fungal and bacterial cells yet decreased overall fungal diversity. Anthropogenic carbon sources can therefore dramatically influence the diversity and quantity of fungi, impact microbial community function, and stimulate Mn(II) oxidation, resulting in a cascade of changes that can strongly influence nutrient and trace element biogeochemical cycles in karst aquifers.

Additional Information

Carmichael, S. K., Zorn, B. T., Santelli, C. M., Roble, L. A., Carmichael, M. J., and Bräuer, S. L. (2015). Nutrient Input Influences Fungal Community Composition And Size And Can Stimulate Mn(II) Oxidation In Caves. Environmental Microbiology Reports. The copy of record is available from Wiley Online Library (13 April 2015), ISSN 1758-2229, http:// Version Of Record Available At Wiley Online Library
Language: English
Date: 2015
fungi, manganese oxidation, Illumina, caves, bacteria

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