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Ambient iron concentration regulates the sulfate reducing activity in the mangrove swamps of Diwar, Goa, India

Show simple item record Attri, K. Kerkar, S. LokaBharathi, P.A. 2015-06-04T03:02:02Z 2015-06-04T03:02:02Z 2011
dc.identifier.citation Estuarine, Coastal and Shelf Science. 95(1); 2011; 156-164. en_US
dc.description.abstract In order to test the hypothesis that the ambient iron concentrations could regulate sulfate reducing activity (SRA) in mangrove areas, 10 cm cores were examined from test and reference sites. The test site at Diwar mangrove ecosystem is highly influenced by iron released by the movement of barges carrying iron ore during the non-monsoon seasons and the reference site at Tuvem is relatively pristine. The average iron concentrations were 17.9 percent (+/-8.06) at Diwar and 6.3 percent (+/-1.5) at Tuvem. Sulfate reducing rates (SRR) ranged from 50.21 to 698.66 nM cm(-3) d(-1) at Tuvem, and from 23.32 to 294.49 nM cm(-3) d(-1) in Diwar. Pearson's correlation coefficients between SRR and environmental parameters showed that at Tuvem, the SRR was controlled by SO(4)(-2) (r = 0.498, p is less than 0.001, n =60) more than organic carbon (r = 0.316 p less than 0.05, n = 60). At Diwar, the SRR was governed by the iron concentrations at an r-value of ?0.761 (p less than 0.001, n = 60), suggesting that ca.58 percent of the variation in SRR was influenced negatively by variations in ambient iron concentrations. This influence was more than the positive influence of TOC (r = 0.615, p less than 0.001, n=60). Laboratory experiments to check the influence of iron on SRR also supported our field observations. At an experimental manipulation of 50 ppm Fe3+ there was an increase in SRR but at 100 ppm an inhibitory effect was observed. At 1000 ppm Fe3+ there was a decrease in the SRR up to 93 percent of the control. Thus, our study showed that ambient iron concentrations influence SRR negatively at Diwar and counters the positive influence of organic carbon. Consequently, the influence could cascade to other biogeochemical processes in these mangrove swamps, especially the mineralization of organic matter to carbon dioxide by sulfate respiration. en_US
dc.publisher Elsevier en_US
dc.subject Biotechnology en_US
dc.title Ambient iron concentration regulates the sulfate reducing activity in the mangrove swamps of Diwar, Goa, India en_US
dc.type Journal article en_US
dc.identifier.impf y

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