Journal
MARINE POLLUTION BULLETIN
Volume 101, Issue 1, Pages 359-365Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2015.10.020
Keywords
Heavy metals; Mangroves; Bioaccumulation; Enrichment; C/N ratio; Nutrient availability
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The accumulation of heavy metals and its impact on the C/N ratio of Avicennia marina of the Patalganga and Amba estuaries were studied. Vadinar was selected as a relatively uncontaminated location for comparison. Cd was accumulated in leaves of the Patalganga and Amba estuarine mangroves; however, at Vadinar it was accumulated and arrested only in roots and stems. Negative correlation of Cr, Cd, Pb and Zn with C in the mangroves suggested that their accumulation may lead to lowered C content in the mangroves. The average C/N ratios in mangroves of the inner Patalganga estuary, Patalganga mouth, and Amba estuary were found to be 80.1 +/- 73,105.8 +/- 12.5 and 52.4 +/- 3.4 respectively, whereas at Vadinar it was well within the expected range (26.4 +/- 2.8). The results of the present study suggest: (i) metal accumulation, leading to less carbon content in plants; (ii) heavy metal enrichment in the root zone sediment, affecting the uptake of nitrogen by plants and resulting in altered C/N ratio. (C) 2015 Elsevier Ltd. All rights reserved.
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