Impact of a large hydraulic barrage on the trace metals concentration in mesozooplankton in the Kochi backwaters, along the Southwest coast of India

• Published in: Marine pollution bulletin 2020-11, Vol.160, p.111568-111568, Article 111568
• Main Authors: Arunpandi, N., Jyothibabu, R., Jagadeesan, L., Parthasarathi, S., Albin, K.J., Pandiyarajan, R.S.
• Format: Article
• Language: English
• Subjects: India; Kochi backwaters; Mesozooplankton; Thannermukkom barrage; Trace metals
• ISSN: 0025-326X; 1879-3363
• DOI: 10.1016/j.marpolbul.2020.111568

This study delineates the impact of a man-made hydrological barrage [Thannermukkom barrage (TB)] on the concentration of selected trace metals (Fe, Zn, Cu, Co, Cr, Mn, Ni, Pb) in mesozooplankton from the Kochi backwaters (KBW). The overall results point out that during Pre-Southwest Monsoon (PRM), the concentration of trace metals in mesozooplankton was high in the upstream due to the closure of the barrage, which essentially causes stagnancy of the waters. Trace metal concentrations in the downstream and upstream regions of KBW were found to be lower during Post- Southwest Monsoon (PSWM) compared to the rest of the seasons. In general, trace metals in mesozooplankton from the KBW showed the following order of concentration: Fe > Mn > Zn > Ni > Cu > Cr > Co > Pb. A comparison with earlier data across the globe showed that trace metal concentration in mesoplankton in the KBW is lower than the values reported from other parts of the world. •Trace metal concentration in mesozooplankton in the Kochi backwaters studied•Trace metal concentration differed spatially and seasonally in Kochi backwaters.•Trace metal concentration was high during Pre- Southwest Monsoon period.•Water stagnancy due to manmade barrage alters the trace metal concentration.