RT Journal Article
T1 Characterizing the surface microlayer in the Mediterranean Sea: trace metal concentrations and microbial plankton abundance
A1 Tovar Sánchez, Antonio
A1 Rodríguez Romero, Araceli
A1 Engel, Anja
A1 Zäncker, Birthe
A1 Fu, Franck
A1 Marañón Sainz, Emilio
A1 Pérez Lorenzo, María
A1 Bressac, Matthieu
A1 Wagener, Thibaut
A1 Triquet, Sylvain
A1 Siour, Guillaume
A1 Desboeufs, Karine
A1 Guieu, Cécile
K1 2510.01 Oceanografía Biológica
AB The Sea Surface Microlayer (SML) is known to be enriched by trace metals relative to the underlying water and harbor diverse microbial communities (i.e., neuston). However, the processes linking metals and biota in the SML are not yet fully understood. The metal (Cd, Co, Cu, Fe, Ni, Mo, V, Zn and Pb) concentrations in aerosol samples in the SML (dissolved and total fractions) and in subsurface waters (SSWs; dissolved fraction at ∼1 m depth) from the western Mediterranean Sea were analyzed in this study during a cruise in May–June 2017. The composition and abundance of the bacterial community in the SML and SSW, the primary production, and Chl a in the SSW were measured simultaneously at all stations during the cruise. Residence times in the SML of metals derived from aerosol depositions were highly variable and ranged from minutes for Fe (3.6±6.0 min) to a few hours for Cu (5.8±6.2 h). Concentrations of most of the dissolved metals in both the SML and SSW were positively correlated with the salinity gradient and showed the characteristic eastward increase in the surface waters of the Mediterranean Sea (MS). In contrast, the total fraction of some reactive metals in the SML (i.e., Cu, Fe, Pb and Zn) showed a negative correlation with salinity and a positive correlation with microbial abundance, which might be associated with microbial uptake. Our results show a strong negative correlation between the dissolved and total Ni concentration and heterotrophic bacterial abundance in the SML and SSW, but we cannot ascertain whether this correlation reflects a toxicity effect or is the result of some other process.
PB Biogeosciences
SN 17264189
YR 2020
FD 2020-04-30
LK http://hdl.handle.net/11093/3623
UL http://hdl.handle.net/11093/3623
LA eng
NO Biogeosciences, 17(8): 2349-2364 (2020)
NO Ministerio de Economía y Competitividad | Ref. CTM2014-59244-C3-3-R
DS Investigo
RD 09-sep-2024