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Trophic status and nutrient regime of Cochin estuarine system, India
Indian Journal of Geo-Marine Sciences ( IF 0.5 ) Pub Date : 2020-09-25
N R Hershey, S B Nandan, K N Vasu

The Cochin estuarine system (CES) being one among the world’s highly polluted and productive estuarine system was monitored to assess the trophic condition in view of the changing nutrient regime. The estuarine system was shallow, with mixo-oligo to mixo-mesohaline salinities (9.65 ± 6.99 ‰). The dissolved oxygen and the pH regime of the water column were 5.92 ± 1.13 mg L-1 and 7.42 ± 0.71, respectively. The study documents high dissolved inorganic nitrogen (28.95 ± 8.47 µmol L-1), dissolved inorganic carbon (1089.87 ± 362.36 µmol L-1), dissolved inorganic phosphate (7.76 ± 3.56 µmol L-1) and gross primary productivity (2.31 ± 1.14 gC m-3 day-1). However, explicitly augmented inorganic nutrients coupled with low dissolved oxygen, pH, and productivity patterns were observed in station 7. High dissolved inorganic carbon denoted net heterotrophic condition. Trophic index (TRIX units) was observed to be high compared to earlier reports, indicated eutrophicated condition with the highest value at station 1 (8.04 ± 0.28). Therefore, proper management interventions are required to restrict allochthonous nutrient loading to protect CES from further anthropogenic impacts and to mitigate the eutrophication process.

中文翻译:

印度科钦河口系统的营养状况和营养状况

考虑到营养状况的变化,对科钦河口系统(CES)进行了监控,以评估营养状况,该系统是世界上污染最严重的生产性河口系统之一。河口系统较浅,混合低盐度为混合-中卤盐度(9.65±6.99‰)。水柱的溶解氧和pH值分别为5.92±1.13 mg L -1和7.42±0.71。研究表明,高溶解无机氮(28.95±8.47 µmol L -1),高溶解无机碳(1089.87±362.36 µmol L -1),高溶解无机磷酸盐(7.76±3.56 µmol L -1)和总初级生产率(2.31±1.14) gC m -3-1)。然而,在站7观察到明显增加的无机养分以及低的溶解氧,pH和生产率模式。高溶解的无机碳表示净异养状态。与先前的报道相比,营养指数(TRIX单位)较高,表明富营养化状况在站点1最高(8.04±0.28)。因此,需要采取适当的管理干预措施来限制异源养分的负载,以保护CES免受进一步的人为影响并减轻富营养化过程。
更新日期:2020-09-25
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