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Article

DOM Biological Lability in an Estuarine System in Two Contrasting Periods

1
CNR—Institute of Biophysics, 56124 Pisa, Italy
2
Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy
3
Université de Toulon, Aix Marseille Université, CNRS, IRD, MIO, 83130 Toulon, France
4
Istituto Nazionale di Oceanografia e Geofisica Sperimentale (OGS), 34010 Trieste, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: X. Antón Álvarez-Salgado
J. Mar. Sci. Eng. 2021, 9(2), 172; https://doi.org/10.3390/jmse9020172
Received: 31 December 2020 / Revised: 26 January 2021 / Accepted: 5 February 2021 / Published: 8 February 2021
(This article belongs to the Special Issue Advances in Marine Dissolved Organic Matter Dynamics)
Estuarine processes play a key role in determining the amount and quality of land-derived dissolved organic matter (DOM) reaching the oceans. Microbial-mediated reactions can affect the concentration, quality, and bioavailability of DOM within an estuary. In this study, we investigated biological DOM removal in a small estuary and its variability in two contrasting seasons (spring and autumn) characterized by natural differences in the concentration and quality of the riverine DOM. Two incubation experiments were carried out using natural DOM and heterotrophic prokaryotes community collected at the estuary in March and September. Dissolved organic carbon (DOC) concentration, DOM fluorescence, and the heterotrophic prokaryotes abundance (HPA) showed marked differences between the two seasons. These parameters were followed through time for up to two months. Despite the marked differences in the initial conditions, the DOC removal rates were surprisingly similar in the two periods (16 µM DOC month−1 in March and 18 µM DOC month−1 in September), with the biggest removal in the first 48 h. The trend of fluorescent DOM (FDOM) during the incubation showed marked differences between the two periods. In March, the net removal of all the FDOM components was observed consistently with the decrease in DOC; whereas, in September, the net production of humic-like substances was observed. View Full-Text
Keywords: DOM; biological lability; FDOM; estuary; Arno River; bacterial growth efficiency DOM; biological lability; FDOM; estuary; Arno River; bacterial growth efficiency
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MDPI and ACS Style

Retelletti Brogi, S.; Casotti, R.; Misson, B.; Balestra, C.; Gonnelli, M.; Vestri, S.; Santinelli, C. DOM Biological Lability in an Estuarine System in Two Contrasting Periods. J. Mar. Sci. Eng. 2021, 9, 172. https://doi.org/10.3390/jmse9020172

AMA Style

Retelletti Brogi S, Casotti R, Misson B, Balestra C, Gonnelli M, Vestri S, Santinelli C. DOM Biological Lability in an Estuarine System in Two Contrasting Periods. Journal of Marine Science and Engineering. 2021; 9(2):172. https://doi.org/10.3390/jmse9020172

Chicago/Turabian Style

Retelletti Brogi, Simona; Casotti, Raffaella; Misson, Benjamin; Balestra, Cecilia; Gonnelli, Margherita; Vestri, Stefano; Santinelli, Chiara. 2021. "DOM Biological Lability in an Estuarine System in Two Contrasting Periods" J. Mar. Sci. Eng. 9, no. 2: 172. https://doi.org/10.3390/jmse9020172

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