Impact of Eutrophication on Shallow Marine Water near Karachi Coast, Pakistan | [Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences • 2018]

Author(s):

1. Farhad Ali: Department of Earth & Environmental Science, Bahria University Karachi Campus,Pakistan

2. Ahmad Hussain: Department of Mechatronics Engineering, Shaheed Zulfiqar Ali Bhutto Institute of Science & Technology (SZABIST),Karachi,Pakistan

3. Yasmin Nergis: Environmental Research Center, Bahria University Karachi Campus,Pakistan

4. Mughal Sharif: Environmental Research Center, Bahria University Karachi Campus,Pakistan

5. Sadaf Faryal Shah: Department of Energy & Environment, Faculty of Engineering Sciences and Technology (FEST), Hamdard University Karachi Campus,Pakistan

6. Absar Ahmed Khan: Office of Research, Innovation & Commercialization (ORIC), Shaheed Zulfiqar Ali Bhutto Institute of Science & Technology (SZABIST),Karachi,Pakistan

Abstract:

The coastal belt of Karachi, Pakistan was studied to estimate the nutritional levels of shallow seawater. It is investigated to study the localized eutrophication phenomena in the coastal region of Ibrahim Haideri and Karachi Port Trust at Kemari. It was found that the coastal regions of Port Qasim, Clifton and Hawke's Bay Beach when compared with the coastal regions of Ibrahim Haideri and Karachi Port Trust Kemari are more impacted with anthropogenic contamination. Over presence of reactive nitrogen and other nutrients were the indication of disposal of solid waste, sewage effluent and industrial effluents. Oxygen depletion due to localized eutrophication causes too much death of biotic components of marine ecosystems that in turn sink to the bottom of shallow water of Ibrahim Haideri and coastal areas of Karachi Port Trust. This phenomenon increases the microbial decomposition, which in turn decreases the average oxygen level to 6.71 mg/L to 6.99 mg/L at Coastal region of Ibrahim Haideri and Karachi Port Trust respectively. The ammonia, nitrogen was calculated as average 22.48 ppm in the seawater samples collected from Ibrahim Haideri and Karachi Port Trust. The average of total phosphorus in the collected from both these coastal regions were estimated as 1.164 mg/L, with high TDS and TSS values, i.e. average 51598.5 mg/L and 862.75 mg/L in the seawater.

Page(s): 27-36

DOI: DOI not available

Published: Journal: Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences, Volume: 55, Issue: 2, Year: 2018

Keywords:

oxygen level , phosphorus level , shallow marine water , Echo System , coastal belt

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