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<title lang=en>Relation between sediment characteristics and the presence of microbial mats in a marine mangrove from the Manche-à-Eau lagoon (Guadeloupe). </title>
<creator>Gontharet, Swanne</creator>
<creator>Crémière, Antoine</creator>
<creator>Blanc-Valleron, Marie-Madeleine</creator>
<creator>Sebilo, Mathieu</creator>
<creator>Gros, Olivier</creator>
<creator>Laverman, Anniet M.</creator>
<creator>Dessailly, David</creator>
<contributor>Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) ; Centre National de la Recherche Scientifique (CNRS) - Université du Littoral Côte d'Opale - Université de Lille, Sciences et Technologies</contributor>
<contributor>University of Tromsø (UiT)</contributor>
<contributor>Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P) ; Muséum National d'Histoire Naturelle (MNHN) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut d'écologie et des sciences de l'environnement de Paris (IEES) ; Institut National de la Recherche Agronomique (INRA) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Biologie de la Mangrove (BM) ; Systématique, adaptation, évolution (SAE) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Centre National de la Recherche Scientifique (CNRS) - Evolution Paris Seine ; Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Université des Antilles et de la Guyane (UAG)</contributor>
<contributor>Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) ; Université de Rennes 1 (UR1) - INEE - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 1439-0108</source>
<source>EISSN: 1614-7480</source>
<source>Journal of Soils and Sediments</source>
<publisher>Springer Verlag</publisher>
<identifier>hal-01682110</identifier>
<identifier>https://hal.univ-antilles.fr/hal-01682110</identifier>
<source>https://hal.univ-antilles.fr/hal-01682110</source>
<source>Journal of Soils and Sediments, Springer Verlag, 2017, 〈10.1007/s11368-016-1555-6〉</source>
<identifier>DOI : 10.1007/s11368-016-1555-6</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s11368-016-1555-6</relation>
<language>en</language>
<subject lang=en>AtomicTOC/TN ratios</subject>
<subject lang=en> Grain size</subject>
<subject lang=en> Mineralogy</subject>
<subject lang=en> Organic matter sources</subject>
<subject lang=en> Stable carbon isotopes</subject>
<subject>[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Purpose: Marine mangrove sediments in the Manche-à-Eau lagoon (Guadeloupe, Caribbean Sea) harbor locally extensive, white microbial mats. These mats cover the surface of reduced sediments near the roots of red mangrove trees, Rhizophora mangle, and are mainly composed of sulfur-oxidizing bacteria belonging to the Beggiatoaceae family, with some filamentous cyanobacteria. The goal of this study was to investigatethe possible influence of sediment characteristics on the presence of these microbial mats. Materials and methods: Four push cores were collected in April 2013, two from zones with microbial mats and two from zones without mats. Sediment characteristics (grain-size distribution, mineralogy, total organic carbon (TOC) and total nitrogen (TN) contents, atomic TOC/TN ratios, and organic matter (OM) δ13C values) were compared for all four cores.Results and discussion: Significant differences were observed between sediments below microbial mats and those without mats. Sediments with microbial mats contained greater amounts of clay, and higher TOC, TN, and TOC/TN ratios, with lower total carbonate content andδ13C values. The higher clay content most likely results from lower fluid flow velocity near to mangrove roots, while higher TOC/TN ratiosand lower δ13C values indicate higher inputs of OM from mangrove trees. These results are consistent with the fact that microbial mats were observed near the roots of mangrove trees, which trap OM from terrestrial vegetation and fine sediments.Conclusions: The grain-size distribution of sediment particles, the total carbonate content, and the δ13C values are the main parameters discriminating between zones with microbial mats and those without mats. Variations in total carbonate content, which is mainly of biogenic origin, result from conditions that are more favorable for benthic organisms in zones without microbial mats. Variations of the TOC/TN ratios are controlled by the presence of a non-negligible amount of inorganic nitrogen bound to surface clay mineral particles and/or by microbial processes.</description>
<date>2017</date>
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