DSI/NRF Research Chair: Shallow Water Ecosystems, Nelson Mandela University, Summerstrand South Campus, Gqeberha, South Africa; South African Environmental Observation Network (SAEON) Elwandle Coastal Node Nelson Mandela University, Ocean Sciences Campus, 4 Gomery Avenue, Summerstrand, Gqeberha 6031, South Africa; Department of Botany, Nelson Mandela University, Summerstrand, South Campus, PO Box 77 000, Gqeberha 6031, South Africa.
DSI/NRF Research Chair: Shallow Water Ecosystems, Nelson Mandela University, Summerstrand South Campus, Gqeberha, South Africa; Department of Botany, Nelson Mandela University, Summerstrand, South Campus, PO Box 77 000, Gqeberha 6031, South Africa.
Mar Pollut Bull. 2023 Jul;192:115007. doi: 10.1016/j.marpolbul.2023.115007. Epub 2023 May 15.
Wetland plants are naturally exposed to high metal concentrations, and often have mechanisms to prevent metal toxicity. This study compared metal concentrations in seagrass (Zostera capensis) and salt marsh (Spartina maritima, Salicornia tegetaria) - to determine their niche as metal sinks. Samples were collected in each season over a year at five sites in the estuary and analysed using a Total X-Ray Fluorescence (TXRF) spectrometer. Spartina maritima and S. tegetaria accumulated in their roots, and displayed little translocation to leaves (BCF = 1-14; TF < 1). Contrastingly, Z. capensis showed high uptake to its leaves (TF = 1-8; Mn, Zn, Cr, Pb, Ni, Cu). Spartina maritima and S. tegetaria were identified as good phytostabilisers (BCF > 1, TF < 1). Compartmentalization was unique to each species, and considering their ecosystem service importance, more plant species should be analysed to estimate their ecological value for management purposes.
湿地植物自然暴露在高浓度的金属环境中，通常具有防止金属毒性的机制。本研究比较了海草（Zostera capensis）和盐沼植物（Spartina maritima、Salicornia tegetaria）中的金属浓度，以确定它们作为金属汇的生态位。在河口的五个地点，一年内每个季节采集样本，使用全 X 射线荧光（TXRF）光谱仪进行分析。Spartina maritima 和 S. tegetaria 积累在根部，很少向叶片转移（BCF = 1-14；TF < 1）。相比之下，Z. capensis 对叶片有很高的吸收能力（TF = 1-8；Mn、Zn、Cr、Pb、Ni、Cu）。Spartina maritima 和 S. tegetaria 被鉴定为良好的植物稳定剂（BCF > 1，TF < 1）。隔室化是每种物种所特有的，考虑到它们在生态系统服务中的重要性，应该分析更多的植物物种，以估计它们的生态价值，用于管理目的。
