Université de la Nouvelle-Calédonie, Institut ISEA and LABEX "Corail", BP R4, 98851 Nouméa cedex, New Caledonia; Aix-Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Campus de Luminy, 13288 Marseille, France.
Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
Sci Total Environ. 2018 Jan 15;612:1091-1104. doi: 10.1016/j.scitotenv.2017.08.257. Epub 2017 Sep 8.
The integration, accumulation and transfer of trace elements across the main tropic levels of many food webs are poorly documented. This is notably the case for the complex trophic webs of coral reef ecosystems. Our results show that in the south-west lagoon of New Caledonia both abiotic (i.e. sediments) and biotic (i.e. primary producers, consumers and predators) compartments are contaminated by trace elements. However, our analyses revealed different contamination patterns from the sources of organic matter to the predators. The trophic levels involved in the sedimentary benthic food web (S-BFW, based on the sedimentary organic matter) and to a lesser extent in the reef benthic food web (R-BFW, based on algal turf) were mainly contaminated by trace elements that originate from mining activities like Ni and associated trace elements (Co, Cr, Fe, and Mn). Trace elements linked to agro-industrial (As, Hg, and Zn) and urban (Ag, Cd, Cu, Pb, Se, and V) activities were also integrated into the S-BFW, but preferentially into the R-BFW, and to a lesser extent into the detrital benthic food web (D-BFW, supplied by sea-grass plants). Most of the trace elements were biodiminished with increasing trophic levels along food webs. However, a marked biomagnification was observed for Hg, and suspected for Se and Zn. These results provide important baseline information to better interpret trace element contamination in the different organisms and trophic levels in a highly diversified coral reef lagoon.
许多食物网中主要营养级之间微量元素的整合、积累和转移记录很少。这在珊瑚礁生态系统的复杂营养网中尤其如此。我们的研究结果表明，在新喀里多尼亚西南泻湖，无生命（即沉积物）和有生命（即初级生产者、消费者和捕食者）的隔室都受到微量元素的污染。然而，我们的分析表明，从有机质的来源到捕食者，污染模式不同。参与沉积底栖食物网（基于沉积有机质的 S-BFW）和在较小程度上参与珊瑚礁底栖食物网（基于藻类草皮的 R-BFW）的营养级主要受到来自采矿活动的微量元素的污染，如 Ni 和相关微量元素（Co、Cr、Fe 和 Mn）。与农业工业（As、Hg 和 Zn）和城市（Ag、Cd、Cu、Pb、Se 和 V）活动相关的微量元素也被整合到 S-BFW 中，但优先整合到 R-BFW 中，其次是碎屑底栖食物网（D-BFW，由海草植物供应）。大多数微量元素随着食物链中营养级的增加而生物减少。然而，Hg 出现了明显的生物放大，Se 和 Zn 也被怀疑出现了生物放大。这些结果为更好地解释高度多样化的珊瑚礁泻湖中不同生物体和营养级的微量元素污染提供了重要的基线信息。
