Limited Bioweathering by Cyanobacteria in Cold, Nutrient-Limited Conditions: Implications for Microbe-Mineral Interactions and Aquatic Chemistry in Cold Environments ...

• Main Authors: Demirel-Floyd, Cansu, Soreghan, G. S., Floyd, J. G., Madden, M. E. Elwood
• Format: Dataset
• Language: unknown
• Published: Taylor & Francis 2024
• Subjects: Biochemistry; Microbiology; FOS Biological sciences; Environmental Sciences not elsewhere classified; Chemical Sciences not elsewhere classified; Biological Sciences not elsewhere classified; Inorganic Chemistry; FOS Chemical sciences; Virology; Antarc*; Antarctic; McMurdo Dry Valleys
• Online Access: https://dx.doi.org/10.6084/m9.figshare.26139240.v1; https://tandf.figshare.com/articles/dataset/Limited_Bioweathering_by_Cyanobacteria_in_Cold_Nutrient-Limited_Conditions_Implications_for_Microbe-Mineral_Interactions_and_Aquatic_Chemistry_in_Cold_Environments/26139240/1

Solute fluxes in Antarctic meltwaters indicate microbial processes influence chemical weathering. Antarctic cyanobacterial mats dominated by Leptolyngbya glacialis enhance weathering rates at 12 °C. Yet, their effects on nutrient fluxes in colder, nutrient-limited conditions, similar to the McMurdo Dry Valleys environments, are unknown. Here, we investigate biotic and abiotic weathering rates of glaciofluvial sediments at 4 °C and compare results to previous experiments at 12 °C. We also examine the effects of nutrient and salt concentrations on weathering fluxes by comparing the effects of different media concentrations (0.1X and 0.001X: 10 and 1000 times diluted) at both temperature conditions. Our results show limited evidence of biologically mediated silica release at 4 °C, yet microbe-mineral interactions still affect nutrient fluxes, particularly for Ca, Mg, Mn, P, and N. However, a higher initial salt concentration (0.1X media) increased the concentration of solutes released under abiotic conditions. ...