Use this identifier to quote or link this document: http://hdl.handle.net/2072/228003

Seasonal dynamics and net production of disolved organic carbon in an oligotrophic coastal environment
Vila-Reixach, G.; Gasol, J.M.; Cardelús, C.; Vidal Barcelona, Montserrat
To understand dissolved organic carbon (DOC) seasonal dynamics in a coastal oligotrophic site in the north-western Mediterranean Sea, we monitored DOC concentrations monthly over 3 yr, together with the meteorological data and the food-web-related biological processes involved in DOC dynamics. Additional DOC samples were taken in several inshore−offshore transects along the Catalan coast. We found DOC concentrations of ~60 µmol C l−1 in winter, with increasing values through the summer and autumn and reaching 100 to 120 µmol C l−1 in November. There was high inter-annual variability in this summer DOC accumulation, with values of 36, 69 and 13 µmol C l−1 for 2006, 2007 and 2008, respectively. The analysis of the microbial food-web processes involved in the DOC balance did not reveal the causes of this accumulation, since the only occasion on which we observed net DOC production (0.3 ± 1 µmol C l−1 d−1 on average) was in 2007, and the negative DOC balance of 2006 and 2008 did not prevent DOC accumulating. The DOC accumulation episodes coincided with low rates of water renewal (average 0.037 ± 0.021 d−1 from May to October) compared with those of winter to early spring (average 0.11 ± 0.048 d−1 from November to April). Indeed, the amount of DOC accumulated each year was inversely correlated with the average summer rainfall. We hypothesize that decreased DOC turn-over due to photochemical or biological processes mostly active during the summer and low water renewal rate combine to determine seasonal DOC accumulation and influence its inter-annual variability.
2014-04-10
Compostos orgànics
Costes
Ecologia de les costes
Metabolisme microbià
Organic compounds
Coasts
Coastal ecology
Microbial metabolism
(c) Inter-Research, 2012
info:eu-repo/semantics/embargoedAccess
Article
info:eu-repo/semantics/publishedVersion
Inter-Research
         

Show full item record

Related documents

Other documents of the same author

Latasa Arcalís, Mikel; Scharek, R.; Vidal Barcelona, Montserrat; Vila-Reixach, G.; Gutiérrez, A.; Emelianov, M.; Gasol, J.M.
Bartual, A.; Arandia-Gorostidi, N.; Cózar, A.; Morillo-García, S.; Ortega, M.J.; Vidal Barcelona, Montserrat; Cabello, A.M.; González-Gordillo, J.I.; Echevarría, F.
Pedrotti, M. L.; Peters, F.; Beauvais, S.; Vidal Barcelona, Montserrat; Egge, J.; Jacobsen, A.; Marrasé, C.
 

Coordination

 

Supporters