Coupling Bacterioplankton Populations and Environment to Community Function in Coastal Temperate Waters

Date

2016-09-27

Author

Traving, Sachia J.
Bentzon-Tilia, Mikkel
Knudsen-Leerbeck, Helle
Mantıkcı, Asım Mustafa
Hansen, Jorgen L. S.
Stedmon, Colin A.
Sorensen, Helle
Markager, Stiig
Riemann, Lasse

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Bacterioplankton play a key role in marine waters facilitating processes important for carbon cycling. However, the influence of specific bacterial populations and environmental conditions on bacterioplankton community performance remains unclear. The aim of the present study was to identify drivers of bacterioplankton community functions, taking into account the variability in community composition and environmental conditions over seasons, in two contrasting coastal systems. A Least Absolute Shrinkage and Selection Operator (LASSO) analysis of the biological and chemical data obtained from surface waters over a full year indicated that specific bacterial populations were linked to measured functions. Namely, Synechococcus (Cyanobacteria) was strongly correlated with protease activity. Both function and community composition showed seasonal variation. However, the pattern of substrate utilization capacity could not be directly linked to the community dynamics. The overall importance of dissolved organic matter (DOM) parameters in the LASSO models indicate that bacterioplankton respond to the present substrate landscape, with a particular importance of nitrogenous DOM. The identification of common drivers of bacterioplankton community functions in two different systems indicates that the drivers may be of broader relevance in coastal temperate waters.

URI

https://hdl.handle.net/11511/109638

Collections

Graduate School of Marine Sciences, Article