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Sources of organic matter in an atypical phytoplankton rich coral ecosystem, Marquesas Islands: composition and properties

机译：非典型浮游植物富含珊瑚生态系统的有机质来源，Marquesas群岛：组成和性质

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The purpose of this work is to characterize several potential sources of organic matter (OM) in the Marquesas Islands, French Polynesia, and to understand how these sources contribute to OM pools. Stable isotope (delta C-13 and delta N-15) and fatty acid (FA) compositions of OM potential sources (algal turf, benthic macroalgae, detrital terrestrial plants (DTP), phytoplankton) and OM pools (sediment (SOM) and particulate organic matter (POM)) were studied in coastal areas in Nuku Hiva Island. Isotope compositions of marine POM (delta C-13=- 22.5 +/- 0.8 parts per thousand; delta N-15=12.1 +/- 1.1 parts per thousand) and SOM (delta C-13=- 19.1 +/- 0.9 parts per thousand; delta N-15=14.4 +/- 0.5 parts per thousand) highlighted that OM sources at the base of the local food web had unusually high delta N-15 values. Potential FA markers of diatoms and/or cyanobacteria (20:5 omega 3 and 16:1 omega 7) were found in these two OM pools. In addition, coastal SOM also displayed FA markers of bacteria, macroalgae and terrestrial plants. For marine POM, potential macroalgae FA markers were recorded (18:2 omega 6 and 16:2 omega 4). The stable isotope mixing model highlighted the major contribution of phytoplankton to the coastal SOM (62%), followed by benthic macroalgae (32%), whereas marine POM was mainly composed of a mixture of algal turf and phytoplankton in similar averaged proportions (38%) but presenting wide variations. Our results as a whole strongly suggest that pelagic-benthic coupled processes drive the characteristics and properties of OM sources.
机译：这项工作的目的是在Marquesas岛，法属波利尼西亚的几个潜在的有机物质（OM）来表征，并了解这些来源如何为OM池有贡献。稳定同位素（Delta c-13和delta n-15）和om潜在来源的脂肪酸（Fa）组成（藻黄草皮，底栖大甲状腺，滴乳陆地植物（DTP），浮游植物）和OM池（沉积物（SOM）和颗粒状有机物（POM）在Nuku Hiva岛的沿海地区进行了研究。海洋POM的同位素组成（Delta C-13 = - 22.5 +/- 0.8份; Delta N-15 = 12.1 +/1-1.1份，SOM（Delta C-13 = - 19.1 +/0.9份千万;三角洲N-15 = 14.4 +/- 0.5分别）突出显示本地食品网底部的OM源具有异常高的ΔN-15值。在这两个OM池中发现了硅藻和/或蓝藻（20：5ω3和16：1 omega 7）的潜在的抗血糖标记物。此外，沿海SOM还展示了细菌，宏观格子和陆地植物的FA标记。对于海洋POM，记录了潜在的大草原法标记（18：2 omega 6和16：2 Omega 4）。稳定的同位素混合模型突出了浮游植物对沿海总统的主要贡献（62％），其次是Benthic Macroalgae（32％），而海洋POM主要由藻类草皮和浮游植物的混合物以类似的平均比例组成（38％ ）但呈现宽的变化。我们的结果总体而言，强烈建议骨质底座耦合过程驱动OM源的特性和性质。

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    《Marine biology》 |2020年第7期|92.1-92.13|共13页
  • 作者

    Fey P.; Parravicini V; Lebreton B.; Meziane T.; Galzin R.; Zubia M.; Banaru D.; Letourneur Y.;

  • 作者单位

    Univ La Nouvelle Caledonie LabEx CORAIL UMR Entropie UR IRD CNRS IFREMER UNC BP R4 Noumea 98851 New Caledonia;

    Univ Perpignan CRIOBE PSL Res Univ EPHE CNRS UPVD LabEx CORAIL USR 3278 F-66860 Perpignan France;

    Univ La Rochelle UMR Littoral Environm & Soc 7266 Inst Littoral & Environm CNRS 2 Rue Olympe Gouges F-17000 La Rochelle France;

    UPMC UMR BOREA 7208 MNHN CNRS IRD 61 Rue Buffon 5 CP 53 F-75231 Paris France;

    Univ Perpignan CRIOBE PSL Res Univ EPHE CNRS UPVD LabEx CORAIL USR 3278 F-66860 Perpignan France;

    Univ French Polynesia UMR EIO LabEx CORAIL BP 6570 F-98702 Tahiti French Polynesi France;

    Aix Marseille Univ CNRS INSU IRD Mediterranean Inst Oceanog Univ Toulon UM 110 F-13288 Marseille France;

    Univ La Nouvelle Caledonie LabEx CORAIL UMR Entropie UR IRD CNRS IFREMER UNC BP R4 Noumea 98851 New Caledonia;

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