Open AccessBacterial uptake of DOM released from P‐limited phytoplankton
Author(s) -
Puddu Alberto,
Zoppini Annamaria,
Fazi Stefano,
Rosati Michela,
Amalfitano Stefano,
Magaletti Erika
Publication year - 2003
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1016/s0168-6496(03)00197-1
Subject(s) - bacterioplankton , biology , phytoplankton , algae , diatom , heterotroph , bacterial growth , proteobacteria , carbon fibers , dissolved organic carbon , extracellular , carbon cycle , environmental chemistry , botany , ecology , bacteria , nutrient , ecosystem , biochemistry , chemistry , genetics , materials science , 16s ribosomal rna , composite number , composite material
The growth and the structure of a coastal bacterioplankton community were monitored in short‐term bottle experiments in order to investigate the bacterial uptake of extracellular organic carbon released by the diatom Cylindrotheca closterium grown under P‐balanced and P‐depleted conditions. Bacterial specific growth rates and carbon demand were significantly lower in the exudates from P‐depleted algae (24% and 30% reduction, respectively). The origin of the extracellular carbon appeared also to affect the taxonomic composition of the bacterioplankton assemblage, mainly reducing the development of γ‐Proteobacteria. This pattern of bacterial carbon uptake could contribute to a longer persistence of the exudates released in P‐depleted conditions affecting the dynamics of the carbon cycle in marine environments.