Occurrence and accumulation of heavy metals in algal turf particulates and sediments on coral reefs
Occurrence and accumulation of heavy metals in algal turf particulates and sediments on coral reefs
复制标题
珊瑚礁藻皮颗粒和沉积物中重金属的存在和积累
DOI：
10.1016/j.marpolbul.2022.114113
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发表时间：
2022
影响因子：
5.8
通讯作者：
Chase, Tory J.
中科院分区：
文献类型：
--
作者：
Tebbett, Sterling B.;Bellwood, David R.;Johnson, Erin R.;Chase, Tory J.
藻类草皮在珊瑚礁上形成了一个关键的界面，与几个关键的生态系统过程相互作用。虽然我们知道这些草坪具有积累沉积物的显著倾向，这可能会对生态系统产生一系列影响，但它们作为重金属汇的作用在很大程度上仍未得到检验。在这里，我们量化了来自大堡礁蜥蜴岛和俄耳甫斯岛的藻类草坪沉积物中15种金属的浓度，并具体探讨了砷、钴、铁和铅的负载量与草坪长度的关系。这两个岛屿的金属组成明显不同，俄耳甫斯岛的金属组成表明与陆地沉积物来源有更密切的联系。此外，随着草坪长度的增加，金属负荷显著增加，这表明较长的草坪可以在珊瑚礁上积累这些污染物。鉴于藻类草皮是食草/有害营养途径的重要组成部分，这可能代表着这些金属进入食物链的关键节点。
Algal turfs form a critical interface on coral reefs that interacts with several key ecosystem processes. While we know these turfs have a remarkable propensity to accumulate sediments, which can have a range of ecosystem impacts, their role as sinks for heavy metals remains largely unexamined. Here we quantified the concentration of 15 metals in algal turf sediments from Lizard Island and Orpheus Island on the Great Barrier Reef, and specifically explored how the loads of arsenic, cobalt, iron and lead were related to turf length. Metal composition differed markedly between the two islands, with the composition at Orpheus Island suggesting closer links to terrestrial sediment sources. Furthermore, metal loads increased significantly with turf length, suggesting that longer turfs can accumulate these pollutants on reefs. Given that algal turfs are a crucial component of herbivorous/detritivorous trophic pathways, this could represent a key juncture at which these metals enter food chains.