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 organic carbon excreted by Cylindrotheca closterium grown in P-balanced and P-depleted conditions. Bacterial carbon demand and specific growth rates were significantly lower in the excreta from P-depleted algae (30% and 24% reduction, respectively). The origin of the excreta appeared also to affect the taxonomic composition of the bacterioplankton assemblage, mainly reducing the development of ×-proteobacteria. This pattern in bacterial carbon uptake could contribute to a longer persistence of the excreta released in P-depleted conditions affecting the dynamics of carbon cycle in the marine environment
Bacterial uptake of DOM released from P-limited phytoplankton
PUDDU A;ZOPPINI A;FAZI S;AMALFITANO S;
2003
Abstract
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 organic carbon excreted by Cylindrotheca closterium grown in P-balanced and P-depleted conditions. Bacterial carbon demand and specific growth rates were significantly lower in the excreta from P-depleted algae (30% and 24% reduction, respectively). The origin of the excreta appeared also to affect the taxonomic composition of the bacterioplankton assemblage, mainly reducing the development of ×-proteobacteria. This pattern in bacterial carbon uptake could contribute to a longer persistence of the excreta released in P-depleted conditions affecting the dynamics of carbon cycle in the marine environmentI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
