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Articles by Khalid Al-Hashmi
Total Records ( 2 ) for Khalid Al-Hashmi
  Khalid Al-Hashmi , Adnan Al-Azri , Michel R. Claereboudt , Sergey Piontkovski and S.M.N. Amin
  Little is known about the physical, biological and chemical oceanographic conditions of Oman’s Avecenia marina dominated coastal mangrove ecosystem. This study provided information on the phytoplankton community structure and biomass (Chla) and their variability in relation to chemical and physical changes in the coastal mangrove ecosystem of Bandar Khyran Bay. Monthly assessments of phytoplankton and (chlorophyll a) accompanied by CTD and nutrient measurements were carried out at one station from January 2001 to December 2001, Chla were moderately low throughout in all probability due to the high water temperatures, low nutrient concentrations and high turbidity as well as the absence of diatoms in the phytoplankton community. The contribution of net phytoplankton >20 μm to total biomass was minimal throughout the study period except during December where it accounted for 53% of the total biomass. Phytoplankton populations within the size range of 0.74-<5 μm accounted for the highest biomass, followed by the size fraction (5-20 μm). A total of 25 net phytoplankton taxa were identified during the study. The overall composition of the community did not show any marked seasonal variations. The net plankton was dominated by a single species of dinoflagellate Peridinium quinquecorne Abe, 1927 throughout the year comprising more the 90% of the species counts where at times it reached bloom proportions. It has been hypothesized that ability of this species to thrive under a range of physical and chemical conditions allows it to survive and outcompete most other phytoplankton species including diatoms.
  Nadir M. Al-Abri , Sergey A. Piontkovski , Mahnaz Rabbaniha , Khalid Al-Hashmi and Tatyana Chesalina
  Background: The fish larval abundance and their species composition both could serve as sensible indicators for predicting catches of mature specimens. In the Sea of Oman, seasonal changes of physical, chemical and biological characteristics of the upper mixed layer are mediated by monsoonal winds. However, available data do not allow one to elucidate statistically reliable seasonal changes of fish larvae communities. Materials and Methods: A plankton net (60 cm in diameter, equipped with mesh size 400 μm) was used to collect samples. A binocular microscope (model SZ-X7) was used to identify, enumerate and measure fish larvae. Results: A total of 1049 fish larvae specimens were collected and their morphometric characteristics identified for the monthly sampling carried out in 2013-2015. Fish larvae were represented by 39 families, 50 genera and 55 species. The top ten most abundant families were Clupeidae, Pomacentridae, Sparidae, Carangidae, Blenniidae, Scombridae, Mullidae, Gerreidae, Chanidae and Sphyraenidae. Conclusion: Seasonal changes of the total fish larvae abundance revealed two peaks corresponding to the time of North-East monsoon and spring inter-monsoon (SIM). The Shannon diversity index was highest during SIM (1.62±0.3). For this season, the total abundance of development stages was 59 ind/100 m3 for the yolk-sac stage, 556 ind/100 m3 for pre-flexion, 175 ind/100 m3 for flexion and 117 ind/100 m3 for the post-flexion stage. The Sardinella spp., fish larvae were the most abundant throughout the year. Seasonal changes of these larvae were consistent with artisanal sardine landings in the region. Consequently, data on fish larvae abundance could be treated as a sensible indicator for predicting seasonal catches of sardines in the region.
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