Bacterioplankton morphotypes structure and cytometric fingerprint rely on environmental conditions in a sub-Antarctic peatland

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• 作者：María Victoria Quiroga ; Gabriela Mataloni ; Bruno M. S. Wanderley…
• 关键词：Bacterioplankton ; Morphotypes structure ; Cytometric fingerprinting ; Peat bog pools ; Minero/ombrotrophic status
• 刊名：Hydrobiologia
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：787
• 期：1
• 页码：255-268
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Freshwater & Marine Ecology; Ecology; Zoology;
• 出版者：Springer International Publishing
• ISSN：1573-5117
• 卷排序：787

文摘

Peatland pools usually show a marked gradient regarding their minerotrophic (harder and less acidic waters) versus ombrotrophic (softer and more acidic waters) status, which appears to be crucial in structuring their planktonic food webs. In this study, we analyzed the effect of such habitat diversity in shaping bacterioplankton assemblages. The planktonic bacteria from five pools located in Rancho Hambre peat bog (Tierra del Fuego Island) were studied through morphological and cytometric approaches, over more than one seasonal cycle. The community was always dominated by small cocci with an average cell size of 0.27 × 0.36 µm. Bacterioplankton morphological structure and cytometric fingerprint were correlated (Mantel test: P < 0.001), both methods used to characterize bacterioplankton showed significant differences between minero- and ombrotrophic pools. Variation in bacterial assemblage structure was mainly explained by abiotic variables relevant in peatlands such as pH, total hardness, conductivity, concentration of inorganic nutrients, and concentration and quality of dissolved organic carbon. Notably, these relatively fast approaches detected similar landscape-driven ecological patterns as previous high-throughput sequencing molecular studies of prokaryotes from the same pools, promising to be useful screening tools for limnological surveys as well as for monitoring the response of bacterial assemblages to environmental changes in peatland ecosystems.