Sujatha, C H; Aneeshkumar, N; Renjith, K R(August , 2008)
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Abstract:
Concentration levels of Cr, Ni, Zn, Pb and Cu in relation
to those of the nutrients - total phosphates, exchangeable
nitrates, total organic carbon, etc. have been
investigated in the sediments of Nagapattinam beach
after the 2004 tsunami. The maximum values in the
study area were 3204, 75, 71, 57 and 18.5 ug g-l for
Cr, Ni, Zn, Pb and Cu respectively; Cd was below detectable
level. All the trace elements were relatively
high in the near-shore sediments and the distribution
pattern of the metals in the study area was in the order:
Cr > Ni > Zn > Pb > Cu. The present study shows that
the tsunami has brought the clayey sediments from
the sea-bottom that were settled for years together in
inland areas as well as from the offshore sediments.
The event has changed the chemical composition of
the beach sediments and is threatening fishing grounds
even in trace concentrations
The mangroves of Kerala are fast disappearing due to developmental activities.There are very few
studies conducted in the chemical aspects of these ecosystems.The main objective of this study is to
assess the spatial and seasonal variation of hydrographical as well as nutrients in mangrove
ecosystems along Kerala coast. Five sampling sites least intervened by industries were selected for
the study. Sampling was done for a period of six months in monthly intervals. A monsoonal hike of
dissolved nutrients was observed in all ecosystems except in the constructed mangrove wetland. The
constructed wetland exhibited a different hydrography and nutrient level in all seasons. The mangrove
forest in this area consists of the species Bruguiera gymnorrhiza which has been planted since forty
years.
Description:
Journal of Wetlands Ecology, (2009) Vol. 3, pp 32-42
Bijoy, Nandan S; Sreedevi, O K; Jayachandran, P R(NATL INST SCIENCE COMMUNICATION-NISCAIR, April , 2012)
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Abstract:
Present study focussed on the water quality status in relation to various anthropogenic activities in the Kodungallur-
Azhikode Estuary (KAE). Average depth of the estuary was 3.6 ± 0.2 m with maximum of 4.3 ± 0.4 m in the estuarine
mouth. Dissolved oxygen showed an average of 5.1±1 mg/l in the water column, whereas the highest BOD value was
noticed during monsoon period (3.1 ± 0.8 mg/l) which could be due to high organic enrichment in the water column. pH
displayed slightly alkaline condition in most of the stations and it varied from 7.2 ± 0.5 in Station 7 to 7.5 ± 0.5 in Station 1.
Salinity in the estuary displayed mixo-mesohaline nature with clear vertical stratification. High river discharge could have
resulted in nutrients and silt loading into the estuary, which makes a highly turbid water column particularly during the
monsoon period, which limits light penetration and subsequent primary productivity. Turbidity in the water column showed
an average of 20.2 ± 15.8 NTU. Estuary was nitrogen limited during post and pre monsoon periods. Nitrate-nitrogen content
in the estuarine water gave negative correlation with ammonia.
Description:
Indian Journal of Geo-Marine Sciences
Vol. 41 (2), April 2012, pp. 180-187