Accumulation and partitioning of heavy metals in mangroves: A synthesis of field-based studies

MacFarlane, Geoff R., Koller, Claudia E. and Blomberg, Simon P. (2007) Accumulation and partitioning of heavy metals in mangroves: A synthesis of field-based studies. Chemsphere, 69 9: 1454-1464.


Author MacFarlane, Geoff R.
Koller, Claudia E.
Blomberg, Simon P.
Title Accumulation and partitioning of heavy metals in mangroves: A synthesis of field-based studies
Journal name Chemsphere  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2007
Sub-type Article
DOI 10.1016/j.chemosphere.2007.04.059
Volume number 69
Issue number 9
ISSN 0045-6535
Start page 1454
End page 1464
Total pages 11
Place of publication United Kingdom
Publisher Elseiver
Language eng
Subject 0602 Ecology
Formatted abstract We report the findings of a comparative analysis examining patterns of accumulation and partitioning of the heavy metals copper (Cu), lead (Pb) and zinc (Zn) in mangroves from available field-based studies to date, employing both species level analyses and a phylogenetic approach. Despite mangroves being a taxonomically diverse group, metal accumulation and partitioning for all metals examined were broadly similar across genera and families. Patterns of metal accumulation were also similar regardless of whether species were classified as salt secreting or non-secreting. Metals were accumulated in roots to concentrations similar to those of adjacent sediments with root bio-concentration factors (BCF; ratio of root metal to sediment metal concentration) of less -than or equals, 1. Root BCFs were constant across the exposure range for all metals. Metal concentrations in leaves were half that of roots or lower. Essential metals (Cu and Zn; translocation factors (TF; ratio of leaf metal to root metal concentration) of 0.52 and 0.53, and leaf BCFs of 0.47 and 0.51, respectively) showed greater mobility than non-essential metals (Pb; TF of 0.31 and leaf BCF of 0.11). Leaf BCFs for the essential metals Cu and Zn decreased as environmental concentrations increased. The non-essential metal Pb was excluded from leaf tissue regardless of environmental concentrations. Thus mangroves as a group tend to operate as excluder species for non-essential metals and regulators of essential metals. For phytoremediation initiatives, mangrove ecosystems are perhaps best employed as phytostabilisers, potentially aiding in the retention of toxic metals and thereby reducing transport to adjacent estuarine and marine systems.
Keyword Bioaccumulation
Mangrove
Heavy metals
Copper
Lead
Zinc
Q-Index Code C1

 
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