PJB-2020-1512
Phytoplankton community dynamics during Asian monsoon system preponderate in the coastal waters of northern region of Arabian sea bordering Pakistan
Farah Naz Khokhar, Zaib-Un-Nisa Burhan, Tahira Naz, Javed Abassi, Naveed Ahmad, Amjad Ali, Pervaiz Iqbal and Pirzada Jamal Ahmed Siddiqui
Abstract
Seasonal variations in population structure of phytoplankton community with respect to water parameters were investigated from in the coastal and near-shore waters (Manora Island and Mubarak Village stations) bordering Karachi in the northern Arabian Sea. Study was conducted from April 2008 - March 2010 and the data was pooled for: i) Spring inter-monsoon (SIM: March–April), ii) Autumn inter-monsoon (AIM: October–November), iii) Southwest monsoon (SWM: May–September), iv) Northeast monsoon (NEM: December–February). A clear seasonal pattern in phytoplankton population structure and composition was recorded. High phytoplankton productivity was recorded during AIM (MI-1; 126 x 103 Cells L-l) and NEM (MI-1; 124x103 Cells L-l) periods. Diatoms contribute significantly higher proportion in the phytoplankton community (120x103cellsL-l) as oppose to dinoflegellates (54.6x103cellsL-l). High phytoplankton taxa counts were recorded at MI stations (200 -208 spp.) during NEM and AIM. High shannon index value 3.5 (SIM) and low 1.14 (SWM) were recorded in near-shore waters at MI and MV, respectively. The Pearson's correlation was calculated and resulted significantly positive correlated among the community and with water parameters. With respect to taxocene structure, MI coatal stations appear to be distinctly different from MI near-shore and MV stations. Influence of reversing monsoonal wind and local effect of Layari outfall on the abundance and distribution is noted.
To Cite this article:
Khokhar, F.N., Z.N. Burhan, T. Naz, J. Abassi, N. Ahmad, A. Ali, P. Iqbal and P.J.A. Siddiqui. 2020. Phytoplankton community dynamics during Asian monsoon system preponderate in the coastal waters of northern region of Arabian sea borderding Pakistan. Pak. J. Bot., 52(2): DOI: http://dx.doi.org/10.30848/PJB2020-2(28)
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