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Article
Pigments of Heritiera fomes seedlings under different salinity conditions: perspective sea level rise.

Authors: A. Mitra --- K. Banerjee
Journal: Mesopotamian Journal of Marine Science مجلة وادي الرافدين لعلوم البحار ISSN: 18152058 Year: 2010 Volume: 25 Issue: 1 Pages: 1-10
Publisher: Basrah University جامعة البصرة

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Abstract

Abstract - Heritiera fomes (commonly known as Sundari in India and Bangladesh) is gradually getting extinct from high saline pockets of lower Gangetic plain. Hydroponically grown seedlings of the species were analyzed for Chl a, Chl b, total chlorophyll, Chl a:b ratio and carotenoid at five different salinity levels (2, 5, 10, 15 and 20 psu). The concentrations of chlorophyll and carotenoid pigments exhibited significant negative correlations with salinity (p < 0.01). The total chlorophyll expressed, on unit fresh wt. basis decreased by 63.39% to 73.33% and in case of carotenoid the decrease was from 27.78% to 36.84% with the increase of salinity from 2 to 20 psu. The Chl a:b ratio in the plant remained almost constant through out the period of investigation. The results show that Heritiera fomes of Indian Sundarbans region can be sustained and propagated under low saline environment. At 15 psu, the plants become acclimated in one to two weeks, but at 20 psu the seedlings could not survive. The study is important as rising salinity is experienced in central Indian Sundarbans of lower Gangetic plain due to sea level rise and obstruction of freshwater flow from Ganga-Bhagirathi-Hooghly channel as a result of heavy siltation.


Article
Bioaccumulation Pattern of Heavy Metals in the Shrimps of the lower stretch of the River Ganga.

Authors: A. Mitra --- K. Banerjee --- R. Ghosh --- S.K. Ray
Journal: Mesopotamian Journal of Marine Science مجلة وادي الرافدين لعلوم البحار ISSN: 18152058 Year: 2010 Volume: 25 Issue: 2 Pages: 110-123
Publisher: Basrah University جامعة البصرة

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Abstract

Abstract - Rapid industrialization and urbanization have contaminated the riverine and estuarine ecosystems to a great extent. To evaluate such kind of contamination, we undertook a research programme to analyze the concentrations of zinc, copper, lead and cadmium in muscle tissue of five commonly edible shrimp species, namely Penaeus monodon, Penaeus indicus, Penaeus semisulcatus, Penaeus marguensis and Metapenaeus brevicornis collected from the lower stretch of the River Ganga (in the Sundarbans delta complex). The heavy metals in tissue samples were estimated using a Perkin-Elmer Sciex ELAN 5000 ICP mass spectrometer. Concentrations in shrimp species ranged as follows: Zn: 4.11 ± 0.13 – 353.45 ± 2.98; Cu: 3.43 ± 0.10– 140.49 ± 1.81; Pb: BDL - 8.21 ± 0.63 and Cd: BDL – 3.66 ± 0.12 mg kg-1 dry weight. Irrespective of species, heavy metals accumulated in the shrimp muscle in the order Zn > Cu > Pb > Cd. The concentration of heavy metals in the tissues varied significantly depending upon the locations from where the species were collected. Although the concentration of selected heavy metals were within the normal range in all stations, but at station 1 (Nayachar Island) the metal level has exceeded in the muscle of shrimp species as a food source for human consumption. The shrimp samples were collected from different locations of lower Gangetic region with different degree of industrial and anthropogenic activities and station 1 is exposed to maximum stress (in terms of pollution) from the adjacent port-cum-industrial zone of Haldia and industrial discharge of multifarious industries situated in and around the city of Calcutta (upstream to station 1) along the bank of the River Ganga.

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