High-Frequency Variability of Bacterioplankton in Response to Environmental Drivers in Red Sea Coastal Waters
Type
ArticleAuthors
Ansari, Mohd Ikram
Calleja, Maria Li
Silva, Luis
Viegas, Miguel
Ngugi, David

Huete-Stauffer, Tamara

Moran, Xose Anxelu G.

KAUST Department
Microbial oceanography Research GroupWater Desalination and Reuse Research Center (WDRC)
Field & Lab Research Support
Red Sea Research Center (RSRC)
Marine Science Program
Biological and Environmental Science and Engineering (BESE) Division
Date
2022-03-31Permanent link to this record
http://hdl.handle.net/10754/676329
Metadata
Show full item recordAbstract
Autotrophic and heterotrophic bacterioplankton are essential to the biogeochemistry of tropical ecosystems. However, the processes that govern their dynamics are not well known. We provide here a high-frequency assessment of bacterial community dynamics and concurrent environmental factors in Red Sea coastal waters. Weekly sampling of surface samples during a full annual cycle at an enclosed station revealed high variability in ecological conditions, which reflected in changes of major bacterioplankton communities. Temperature varied between 23 and 34°C during the sampling period. Autotrophic (Synechococcus, 1.7–16.2 × 104 cells mL−1) and heterotrophic bacteria (1.6–4.3 × 105 cells mL−1) showed two maxima in abundance in spring and summer, while minima were found in winter and autumn. Heterotrophic cells with high nucleic acid content (HNA) peaked in July, but their contribution to the total cell counts (35–60%) did not show a clear seasonal pattern. Actively respiring cells (CTC+) contributed between 4 and 51% of the total number of heterotrophic bacteria, while live cells (with intact membrane) consistently accounted for over 90%. Sequenced 16S rRNA amplicons revealed a predominance of Proteobacteria in summer and autumn (>40%) and a smaller contribution in winter (21–24%), with members of the Alphaproteobacteria class dominating throughout the year. The contribution of the Flavobacteriaceae family was highest in winter (21%), while the Rhodobacteraceae contribution was lowest (6%). Temperature, chlorophyll-a, and dissolved organic carbon concentration were the environmental variables with the greatest effects on bacterial abundance and diversity patternsCitation
Ansari, M. I., Calleja, M. LI., Silva, L., Viegas, M., Ngugi, D. K., Huete-Stauffer, T. M., & Morán, X. A. G. (2022). High-Frequency Variability of Bacterioplankton in Response to Environmental Drivers in Red Sea Coastal Waters. Frontiers in Microbiology, 13. https://doi.org/10.3389/fmicb.2022.780530Sponsors
Supported by King Abdullah University for Science and Technology (KAUST) through the baseline funding provided to XAGMWe gratefully acknowledge all the personnel involved in the weekly sampling. We thank Najwa Al-Otaibi and Eman I. Sabbagh for their assistance in sample collection.
Publisher
Frontiers Media SAJournal
Frontiers in microbiologyPubMed ID
35432231Additional Links
https://www.frontiersin.org/articles/10.3389/fmicb.2022.780530/fullae974a485f413a2113503eed53cd6c53
10.3389/fmicb.2022.780530
Scopus Count
Except where otherwise noted, this item's license is described as Archived with thanks to Frontiers in microbiology under a Creative Commons license, details at: https://creativecommons.org/licenses/by/4.0/
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