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Sultan Qaboos University

Seasonal and interannual changes of phytoplankton community and dynamics of potentially harmful phytoplankton in coastal waters of Muscat, Sea of Oman

Al-Hashmi, Khalid Abdullah.

Titre : Seasonal and interannual changes of phytoplankton community and dynamics of potentially harmful phytoplankton in coastal waters of Muscat, Sea of Oman

Auteur : Al-Hashmi, Khalid Abdullah.

Université de soutenance : Sultan Qaboos University

Grade : Doctor of Philosophy in Marine Sciences and Fisheries 2015

Résumé
Comprehensive data are presented on the species composition, seasonal and interannual abundance of diatoms and dinoflagellates, trends in the abundance of potentially harmful microalgae in relation to the physical and chemical parameters that affect abundance and distribution from April 2006 through April 2011 from a single location in the Bay of Bandar Khayran (BK). In addition, the spatial and temporal variability of phytoplankton in Bandar Khayran bay as an enclosed ecosystem was compared to offshore waters (OFF) of Muscat as an open ecosystem. Moreover, the temporal variability in sizefractionation of a natural phytoplankton population was investigated to estimate the relative contribution of the different size classes to the overall phytoplankton community and their relationship to environmental conditions. A total of 278 dinoflagellate and diatom taxa were recorded during the study. The Dinophyceae contributed the highest number of species (166) followed by Bacillariophyceae (112). The number of genera present was largest during the Southwest Monsoon (SWM) followed by the Northeast Monsoon (NEM) and lowest during the Spring Intermonsoon (SPIM) with considerable interannual variability. Dinoflagellates were the most important group in the Bay of Bandar Khayran. They constituted 59.7 % of the total species identified in the Bay and dominated the total phytoplankton population most of the year. During the study period, they comprised 83% of the total abundance and 88 % of the total biomass. Diatoms were the second important group and contributed 40.3 % to the total species identified in the Bay. They comprised only 17% of the total abundance and only 11 % of the total biomass during the study period. Diatoms were observed in countable numbers only during 2006 and 2010. Higher abundances of diatoms were observed during February March and AugustSeptember (NEM and SWM respectively) when higher input of nutrients were noticed. Chlorophyll a (Chl a) was associated with diatoms and diatoms were dependent on silicate concentrations.

Présentation (SHUAA)

Annonce (Almandumah)

Page publiée le 4 juin 2022