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Article

Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast

1
Global Change Research Group, Department of Oceanography and Global Change, CSIC-UIB Instituto Mediterraneo de Estudios Avanzados (IMEDEA), 07190 Esporles, Spain
2
Red Sea Research Centre, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
3
Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, 36390 Vigo, Spain
4
Organic Geochemistry Lab, CSIC Instituto de Investigaciones Marinas, 36208 Vigo, Spain
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(11), 911; https://doi.org/10.3390/jmse8110911
Received: 30 September 2020 / Revised: 29 October 2020 / Accepted: 8 November 2020 / Published: 12 November 2020
(This article belongs to the Special Issue Advances in Marine Dissolved Organic Matter Dynamics)
Posidonia oceanica is a well-recognized source of dissolved organic matter (DOM) derived from exudation and leaching of seagrass leaves, but little is known about its impact on the chromophoric fraction of DOM (CDOM). In this study, we monitored for two years the optical properties of CDOM in two contrasting sites in the Mallorca Coast (Balearic Islands). One site was a rocky shore free of seagrass meadows, and the second site was characterized by the accumulation of non-living seagrass material in the form of banquettes. On average, the integrated color over the 250–600 nm range was almost 6-fold higher in the beach compared with the rocky shore. Furthermore, the shapes of the CDOM spectra in the two sites were also different. A short incubation experiment suggested that the spectral differences were due to leaching from P. oceanica leaf decomposition. Furthermore, occasionally the spectra of P. oceanica was distorted by a marked absorption increase at wavelength < 265 nm, presumably related to the release of hydrogen sulfide (HS) associated with the anaerobic decomposition of seagrass leaves within the banquettes. Our results provide the first evidence that P. oceanica is a source of CDOM to the surrounding waters. View Full-Text
Keywords: Posidonia oceanica; seagrass-derived organic matter; banquettes; colored dissolved organic matter; coastal Mediterranean Sea Posidonia oceanica; seagrass-derived organic matter; banquettes; colored dissolved organic matter; coastal Mediterranean Sea
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MDPI and ACS Style

Iuculano, F.; Duarte, C.M.; Otero, J.; Álvarez-Salgado, X.A.; Agustí, S. Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast. J. Mar. Sci. Eng. 2020, 8, 911. https://doi.org/10.3390/jmse8110911

AMA Style

Iuculano F, Duarte CM, Otero J, Álvarez-Salgado XA, Agustí S. Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast. Journal of Marine Science and Engineering. 2020; 8(11):911. https://doi.org/10.3390/jmse8110911

Chicago/Turabian Style

Iuculano, Francesca, Carlos M. Duarte, Jaime Otero, Xosé Antón Álvarez-Salgado, and Susana Agustí. 2020. "Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast" Journal of Marine Science and Engineering 8, no. 11: 911. https://doi.org/10.3390/jmse8110911

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