RT Journal Article
T1 Effects of elevated CO2 and phytoplankton-derived organic matter on the metabolism of bacterial communities from coastal waters
A1 Fuentes Lema, Antonio
A1 Sanleón Bartolomé, Henar
A1 Lubián Chaichío, Luis María
A1 Sobrino García, Maria Cristina
K1 2417.05 Biología Marina
K1 2510.01 Oceanografía Biológica
AB Microcosm experiments to assess the bacterioplankton's responseto phytoplankton-derived organic matter obtained under current andfuture ocean CO2 levels were performed. Surface seawater enriched withinorganic nutrients was bubbled for 8 days with air (current CO2scenario) or with a 1000 ppm CO2 air mixture (future CO2 scenario)under solar radiation. The organic matter produced under the current andfuture CO2 scenarios was subsequently used as an inoculum. Triplicate 12 Lflasks filled with 1.2 µm of filtered natural seawater enriched with theorganic matter inocula were incubated in the dark for 8 days underCO2 conditions simulating current and future CO2 scenarios, to study thebacterial response. The acidification of the media increased bacterialrespiration at the beginning of the experiment, while the addition of theorganic matter produced under future levels of CO2 was related tochanges in bacterial production and abundance. This resulted in a 67 %increase in the integrated bacterial respiration under future CO2conditions compared to present CO2 conditions and 41 % higherintegrated bacterial abundance with the addition of the acidified organicmatter compared to samples with the addition of non acidified organicmatter. This study demonstrates that the increase in atmospheric CO2levels can impact bacterioplankton metabolism directly, by changes in therespiration rate, and indirectly, by changes on the organic matter, whichaffected bacterial production and abundance.
PB Biogeosciences
SN 17264189
YR 2018
FD 2018-11-20
LK http://hdl.handle.net/11093/4295
UL http://hdl.handle.net/11093/4295
LA eng
NO Biogeosciences, 15(22): 6927-6940 (2018)
NO Xunta de Galicia | Ref. ED431G/06
DS Investigo
RD 13-sep-2024