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Elucidating the Impact of Metals on the Metabolic Profiles and Taxonomic Structure of Bacterial Communities within the Chattanooga Fen
Başlık:
Elucidating the Impact of Metals on the Metabolic Profiles and Taxonomic Structure of Bacterial Communities within the Chattanooga Fen
Yazar:
Foster, Kelsey, author.
ISBN:
9780438146624
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (84 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Timberley M. Roane Committee members: Annika Mosier; Christopher Phiel.
Özet:
Fens, marshy wetlands with an accumulation of partially decomposed organic matter known as peat, are estimated to store up to a third of the Earth's soil organic carbon. The Chattanooga Fen, located in the San Juan National Forest in southwestern Colorado, is anthropogenically and endogenously impacted by elevated concentrations of toxic metals. The anthropogenic source of metals to the Fen is Acid Mine Drainage (AMD), acidic metal-rich effluent formed by oxidized metals from the nearby Gold Finch Mine. The endogenous metal impact on the Fen is a result of subsurface acid rock drainage (ARD) formed from the natural oxidation of sulfur-bearing minerals. While the entirety of the Fen is naturally impacted by ARD-associated metals, the geographical terrain bisects the Fen into AMD-affected and AMD-unaffected portions. The chemical profiles of ARD and AMD are distinctly different from each other in terms of dissolved metal concentrations, pH, and anions. This study aimed to elucidate the impact of AMD in shaping the taxonomic diversity and carbon usage of the microbial communities within this rare, uncharacterized Fen. Sediment cores and water samples were collected in July and September 2016 at the outflow of the Gold Finch mine, along an AMD-gradient, and from naturally metal-impacted sediments unimpacted by AMD. Illumina high-throughput sequencing of extracted 16S rDNA from sediments provided the taxonomic structure of the bacterial communities within the different areas of the Fen. Carbon source usage was evaluated via BIOLOG EcoPlates and qPCR of three glycoside hydrolase (GH) genes. Data suggests that differences in both taxonomic structure and carbon source utilization can be explained by the presence of AMD. Sediments unaffected by AMD had a higher relative abundance of Acidobacteria, while Deltaproteobacteria was dominant in AMD-affected sediments. The communities within the AMD-affected sediments also utilized a higher proportion of carboxylic acids on the culture-based EcoPlates, while the unaffected samples displayed a greater usage of carbohydrates in terms of resulting optical density values. However, there were two commonalities between AMD-affected and unaffected sediments which was the use of xylose and cellobiose. The average number of carbon sources utilized by unaffected samples was 35.5% greater than affected; the lowest number of substrates being used was observed with the direct acid mine effluent samples. The abundance of all three GH genes was also greater in all AMD-unaffected samples compared to AMD-affected samples. The understanding of how metal source impacts the diversity and functional potential of microorganisms within the Chattanooga Fen, and other similar fen systems, will be essential in influencing future management decisions.
Notlar:
School code: 0765
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(688126.1) | 688126-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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