Assessment of biotic response to heavy metal contamination in Avicennia marina mangrove ecosystems in Sydney Estuary, Australia.
Assessment of biotic response to heavy metal contamination in Avicennia marina mangrove ecosystems in Sydney Estuary, Australia.
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DOI：
10.1016/j.ecoenv.2014.06.019
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发表时间：
2014-09
影响因子：
6.8
通讯作者：
B. Nath;P. Chaudhuri;G. Birch
中科院分区：
文献类型：
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作者：
B. Nath;P. Chaudhuri;G. Birch
红树林是沿着工业化热带和亚热带海岸线的陆源废水的天然过滤器，有助于维持海洋生态系统的健康生存条件。目前，这些潮间带社区受到严重的威胁，由人类活动引起的重金属污染与快速城市化和工业化。研究这些植物对重金属污染的生物响应对河口管理和维护海岸带生态系统健康具有重要意义。本研究的主要目的是通过测定在悉尼河口（澳大利亚）15个地点采集的白骨壤（Avicennia marinaecosystems）叶片、细营养根和底层沉积物中的金属浓度，评估生物对重金属污染的响应。A.下垫面沉积物中金属元素（特别是Cu、Pb和Zn）的含量根据《临时沉积物质量准则》，海水中的汞含量达到了偶尔可能对植物群产生不利生物影响的水平。金属在细营养根中的积累量大于下垫面沉积物，但是，只有少量的金属转运到A。观察到marinaleaves（除Mn外，所有元素的平均易位因子TF <0.13）。必需元素的易位因子（即，常见植物微量元素Cu、Ni、Mn和Zn的含量高于非必需元素As、Cd、Co、Cr和Pb，表明A.该河口的红树林选择性地排除非必需元素，同时调节必需元素并限制对植物的毒性。本研究支持了A. marinamangroves作为一种植物稳定剂在这个高度改造的河口，从而保护水生生态系统免受点或非点源重金属污染。
Mangrove forests act as a natural filter of land-derived wastewaters along industrialized tropical and sub-tropical coastlines and assist in maintaining a healthy living condition for marine ecosystems. Currently, these intertidal communities are under serious threat from heavy metal contamination induced by human activity associated with rapid urbanization and industrialization. Studies on the biotic responses of these plants to heavy metal contamination are of great significance in estuary management and maintaining coastal ecosystem health. The main objective of the present investigation was to assess the biotic response inAvicennia marinaecosystems to heavy metal contamination through the determination of metal concentrations in leaves, fine nutritive roots and underlying sediments collected in fifteen locations across Sydney Estuary (Australia). Metal concentrations (especially Cu, Pb and Zn) in the underlying sediments ofA. marinawere enriched to a level (based on Interim Sediment Quality Guidelines) at which adverse biological effects to flora could occasionally occur. Metals accumulated in fine nutritive roots greater than underlying sediments, however, only minor translocation of these metals toA. marinaleaves was observed (mean translocation factors, TFs, for all elements <0.13, except for Mn). Translocation factors of essential elements (i.e., common plant micro-nutrients, Cu, Ni, Mn and Zn) were greater than non-essential elements (As, Cd, Co, Cr and Pb), suggesting thatA. marinamangroves of this estuary selectively excluded non-essential elements, while regulating essential elements and limiting toxicity to plants. This study supports the notion thatA. marinamangroves act as a phytostabilizer in this highly modified estuary thereby protecting the aquatic ecosystem from point or non-point sources of heavy metal contamination.