Abstract
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials AME 67:251-263 (2012) - DOI: https://doi.org/10.3354/ame01596 Rapid regulation of phosphate uptake in freshwater cyanobacterial blooms Luis Aubriot*, Sylvia Bonilla Phytoplankton Ecology and Physiology Group, Sección Limnología, Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo 11400, Uruguay *Email: laubriot@fcien.edu.uy ABSTRACT: Cyanobacterial blooms are generally explained by nutrient uptake kinetic constants that may confer competitive capabilities, like high nutrient-uptake rate, affinity, and storage capacity. However, cyanobacteria are capable of flexible physiological responses to environmental nutrient fluctuations through adaptation of their phosphate uptake properties. Growth optimization is possible if the physiological reaction time of cyanobacteria (tR) matches the duration of nutrient availability. Here, we investigate the tR of this complex physiological process. We performed [32P] uptake experiments with filamentous cyanobacterial blooms. The phytoplankton were subjected to different nutrient exposure times (tE) by varying patterns of phosphate additions. After 15 to 25 min of phosphate tE, the cyanobacteria-dominated phytoplankton began their adaptive response by reducing and finally ceasing uptake activity before exhausting their nutrient uptake capacity. The time of onset of phosphate uptake regulation (in min) is an indicator of tR. Rapid adaptive behaviour may be the initial phase of longer-term nutrient acclimation (hours to days), which results in a higher growth rate. The growth response of bloom-forming cyanobacteria may be more dependent on the ability to optimize the uptake of phosphate during the time span of nutrient fluctuation than on the amount of nutrient taken up per se. Freshwater cyanobacterial blooms may therefore be promoted by their short tR during phosphate fluctuations. KEY WORDS: Physiological adaptation · Physiological reaction time · Phosphate uptake · Cyanobacteria · Growth optimization · Phytoplankton · Environmental fluctuations Full text in pdf format PreviousCite this article as: Aubriot L, Bonilla S (2012) Rapid regulation of phosphate uptake in freshwater cyanobacterial blooms. Aquat Microb Ecol 67:251-263. https://doi.org/10.3354/ame01596 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AME Vol. 67, No. 3. Online publication date: November 06, 2012 Print ISSN: 0948-3055; Online ISSN: 1616-1564 Copyright © 2012 Inter-Research.
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