Enhanced microbial utilisation of dissolved amino acids indicates rapid modification of organic matter in the benthic boundary layer
W Ritzrau
L Thomsen
RJ Lara
G Graf
Abstract
Recent information on activity, abundance, and size of bacteria as well as concentration and composition of particles in the benthic boundary layer (BBL, range of water depths 191 to 479 m) was compared to the distribution of these parameters in 2 layersof the water column, the chlorophyll maximum layer (range of water depths 13 to 25 m) and the intermediate water depth (IWC, range of water depths 136 to 486 m). Microbial activities and concentrations of various biochemical parameters displayed distinctvariation patterns in the BBL, exhibiting higher values compared to their variations in the chlorophyll maximum layer and the IWC. In the BBL the microbial utilisation of 14C-amino acids revealed no correlation with concentrations ofparticulate organic carbon (POC), but was related to chlorophyll a (chl a) equivalents and the ratio of POC and chl a equivalents. The distribution of dissolved free amino acids (DFAA) suggests that not necessarily the concentrationbut alternatively the accessibility (concentration and transport rate) of DFAA to bacteria determines heterotrophic activity. Results indicate that the BBL represents a distinct environment with rapid modification of organic matter prior to its finalincorporation into the sediment.
Ritzrau W., Thomsen L., Lara R. and Graf G. (1997) Enhanced microbial utilisation of dissolved amino acids indicates rapid modification of organic matter in the benthic boundary layer. Marine Ecology Progress Series 156: 43-50. 10.3354/meps156043
@article{Ritzrau1997,
Title = {Enhanced microbial utilisation of dissolved amino acids indicates rapid modification of organic matter in the benthic boundary layer},
Author = {Ritzrau, W and Thomsen, L and Lara, RJ and Graf, G},
Editor = {},
Journal = {Marine Ecology Progress Series},
Year = {1997},
Pages = {43-50},
Volume = {156},
Doi = {10.3354/meps156043},
Abstract = {Recent information on activity, abundance, and size of bacteria as well as concentration and composition of particles in the benthic boundary layer (BBL, range of water depths 191 to 479 m) was compared to the distribution of these parameters in 2 layersof the water column, the chlorophyll maximum layer (range of water depths 13 to 25 m) and the intermediate water depth (IWC, range of water depths 136 to 486 m). Microbial activities and concentrations of various biochemical parameters displayed distinctvariation patterns in the BBL, exhibiting higher values compared to their variations in the chlorophyll maximum layer and the IWC. In the BBL the microbial utilisation of 14C-amino acids revealed no correlation with concentrations ofparticulate organic carbon (POC), but was related to chlorophyll a (chl a) equivalents and the ratio of POC and chl a equivalents. The distribution of dissolved free amino acids (DFAA) suggests that not necessarily the concentrationbut alternatively the accessibility (concentration and transport rate) of DFAA to bacteria determines heterotrophic activity. Results indicate that the BBL represents a distinct environment with rapid modification of organic matter prior to its finalincorporation into the sediment.},
}
TY - JOUR
AU - Ritzrau, W
AU - Thomsen, L
AU - Lara, RJ
AU - Graf, G
TI - Enhanced microbial utilisation of dissolved amino acids indicates rapid modification of organic matter in the benthic boundary layer
T2 - Marine Ecology Progress Series
PY - 1997
SP - 43-50
VL - 156
DO - 10.3354/meps156043
AB - Recent information on activity, abundance, and size of bacteria as well as concentration and composition of particles in the benthic boundary layer (BBL, range of water depths 191 to 479 m) was compared to the distribution of these parameters in 2 layersof the water column, the chlorophyll maximum layer (range of water depths 13 to 25 m) and the intermediate water depth (IWC, range of water depths 136 to 486 m). Microbial activities and concentrations of various biochemical parameters displayed distinctvariation patterns in the BBL, exhibiting higher values compared to their variations in the chlorophyll maximum layer and the IWC. In the BBL the microbial utilisation of 14C-amino acids revealed no correlation with concentrations ofparticulate organic carbon (POC), but was related to chlorophyll a (chl a) equivalents and the ratio of POC and chl a equivalents. The distribution of dissolved free amino acids (DFAA) suggests that not necessarily the concentrationbut alternatively the accessibility (concentration and transport rate) of DFAA to bacteria determines heterotrophic activity. Results indicate that the BBL represents a distinct environment with rapid modification of organic matter prior to its finalincorporation into the sediment.
ER -
