Cabrita Maria Teresa, Padeiro Ana, Amaro Eduardo, Dos Santos Margarida Correia, Leppe Marcelo, Verkulich Sergey, Hughes Kevin A, Peter Hans-Ulrich, Canário João
Portuguese Institute of Sea and Atmosphere (IPMA), Av. de Brasília, 1449-006 Lisboa, Portugal.
Centro de Química Estrutural, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal.
Mar Pollut Bull. 2017 Aug 15;121(1-2):192-200. doi: 10.1016/j.marpolbul.2017.05.059. Epub 2017 Jun 7.
In order to evaluate trace element bioavailability and potential transfer into marine food chains in human impacted areas of the Fildes Peninsula (King George Island, South Shetland Islands Archipelago), element levels (Cr, Ni, Cu, Zn, Cd, and Pb) were determined in water, sediments, phytoplankton, and in diatom Phaeodactylum tricornutum Bohlin (Bacillariophyceae) cells immobilised in alginate and exposed to water and sediments, from the Bellingshausen Dome (reference site) and Ardley Cove (human impacted area), during January 2014. High element concentrations in exposed P. tricornutum indicated element mobilisation from sediments into the water. Levels in exposed cells reflected the sediment element content pattern, comparable to those found in phytoplankton, supporting phytoplankton as an important path of trace element entry into marine food chains. This study clearly shows immobilised P. tricornutum as good proxy of phytoplankton concerning element accumulation efficiency, and an effective tool to monitor trace element contamination in polar coastal ecosystems.
为了评估菲尔德斯半岛（南设得兰群岛乔治王岛）受人类影响区域中微量元素的生物有效性及其向海洋食物链的潜在转移情况，于2014年1月测定了别林斯高晋穹丘（参考站点）和阿德利湾（受人类影响区域）的水、沉积物、浮游植物以及固定在藻酸盐中并暴露于水和沉积物中的硅藻三角褐指藻（Bacillariophyceae）细胞中的元素水平（铬、镍、铜、锌、镉和铅）。暴露的三角褐指藻中高浓度的元素表明元素从沉积物转移到了水中。暴露细胞中的元素水平反映了沉积物中元素含量模式，与浮游植物中的情况相当，这支持了浮游植物是微量元素进入海洋食物链的重要途径。这项研究清楚地表明，固定化的三角褐指藻在元素积累效率方面是浮游植物的良好替代物，也是监测极地沿海生态系统中微量元素污染的有效工具。
