Seasonal variations in physico-chemical parameters of Buleji and Paradise Point rocky shores at Karachi coast

Year 2018, Volume: 5 Issue: 2, 154 - 168, 01.08.2018

Fatima Hayat Shaheen Zafar Zarrien Ayub Aasia Karim Mohammad Zahid Levent Bat

https://doi.org/10.30897/ijegeo.418709

Abstract

The aim of the current study
was to determine common physico-chemical parameters (salinity, temperature,
chlorophyll-a, dissolved oxygen, and
pH) of coastal water of two rocky shores from Buleiji and Paradise Point rocky
shores at Karachi monthly basis, from November 2007 to April 2009. The range of
air and surface water temperature of Buleji varies from 19 ºC to 30 ºC and 21ºC
to 29 ºC, respectively. Almost similar air temperature and seawater temperature
(19º to 29º C) were recorded at Paradise Point. Salinity ranged from 35 to 39 ‰
at Buleji while it ranged between 35 to 40 ‰ at Paradise Point. The lowest
concentrations of dissolved oxygen was recorded in November’07 and November’08
at both sites, at Buleiji which were 1.6 mg/L and 1.7 mg/L while at Paradise
Point it was 1.8 mg/L and 1.7 mg/L, respectively. The pH value ranged from 7.0
to 8.3 at Buleji and from 7.5 to 8.4 at Paradise Point. The concentrations of
chlorophyll-a were between 1.2 and 3.7
µg cm-2 at Buleji while it ranged from 0.9 to 3.3 µg cm-2 at Paradise Point.
Results showed that the obtained values of temperatures, salinity, pH and   chlorophyll-a are favorable for the continued
survival of marine biota but the values of dissolved oxygen were found to be
below 4 mg/L which are not suitable for various species. Prolonged periods of
minimal dissolved oxygen directly upset larval stages of numerous marine
organisms. In Karachi coastal areas, seasonal accessibility of surface water is
very responsive to the monsoon climate and physiography of coastal belt. These
concerns were used to inform the common people and decision-makers about the
state of the coastal environments. To protect these dynamic significant
habitats, the government organizations and researchers should work with
appropriate consideration.

 

Keywords

Physico-chemical parameters, Chlorophyll-a, rocky shore, Karachi coast, the Northeastern Arabian Sea

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