Document Details

Document Type : Thesis 
Document Title :
BIOACCUMULATION OF HEAVY METAL IN SOME MARINE MICROALGAE OF RED SEA, SAUDI ARABIA
التراكم الحيوي للمعادن الثقيلة في بعض أنواع الطحالب الدقيقة من البحر الأحمر المملكة العربية السعودية
 
Subject : Faculty of Marine Sciences 
Document Language : Arabic 
Abstract : The impact of anthropogenic influences on the distribution and diversity of marine phytoplankton has been studied from the coastal waters of Jeddah, Saudi Arabia. Influences such as inorganic nutrient loading and heavy metal concentrations were studied in details. Temperature showed clear temporal variation and it fluctuated between 24.5 ºC during the pre-summer season to 30.1 ºC during the summer season. Salinity showed clear spatial variation in between the station with a lower value of 35.1 and higher value of 39.9. Salinity values witnessed significantly lower values from the lagoon stations throughout the study period than the other coastal stations that showed the typical Red Sea nature. Inorganic nutrients observed with eutrophic level concentrations from the two-lagoon stations resultant of the heavy sewage disposal in those sites. Other coastal stations continued to follow the oligotrophic tradition of the Red Sea and displayed considerably lower numbers. Nitrate showed a variation in between 0.05 μmol L-1 to 29.3 μmol L-1 during the entire study period, while nitrite fluctuated between 0.04 μmol L-1 to 20.27 μmol L-1. Ammonia was considerably higher than the other inorganic nutrients observed during the study period. It showed a lower concentration of 0.22 μmol L-1 and a higher concentration of 78.16 μmol L-1. Phosphate concentration for the entire study period showed a fluctuation in between 0.02 μmol L-1 to 25.90 μmol L-1 and silicate were varied in between 0.43 μmol L-1and 24.50 μmol L-1. The trace metals too showed variation, but were minimal in comparison to the inorganic nutrients. Zinc was the most common heavy metal that showed higher concentrations than the other ones throughout the study period. The highest concentration obtained during post-summer season and was 21.11 ppm, while the lowest reported during the summer and the concentration was 0.3 ppm. Cadmium was the least represented heavy metal during the whole study period and it showed a value range between 0.07 ppm to 2.4 ppm. Very similar to the inorganic nutrients, phytoplankton biomass in terms of chlorophyll a showed high spatial variation with the lagoon stations accounted for almost a eutrophic level concentration throughout the study. The coastal stations witnessed lower phytoplankton biomasses very similar to the entire Red Sea ecosystem. Minimum chlorophyll a obtained was 0.13 mg m-3, while the maximum obtained was 269.14 mg m-3.Similarly, phytoplankton density also accounted for higher numbers from the lagoon stations. The total phytoplankton density varied in between 52 × 103 cells m-3 and 40800 × 103 cells m-3 with the coastal stations observed with significantly lower numbers in comparison to the lagoon ones. Diatoms dominated the phytoplankton distribution in comparison to the dinoflagellates and cyanophytes. The higher densities observed from the lagoon stations were mainly due to the proliferation of some diatom species. In terms of diversity, dinoflagellates surpassed diatoms during the summer season otherwise is mainly dominated by diatoms. Cyanophytes were more prominent during the summer and post-summer seasons. Three types of phytoplankton were isolated and introduced to concentrations (5-10 ppm) of heavy metals (chromium, bismuth, nickel and cobalt). The result showed that the first type (Cyclotella sp.) was able to grow when compared with other tow phytoplankton. The research showed that Cyclotella sp. could act as a versatile filter for heavy metal adsorption in the marine environment. This can be used as a water treatment method. .__ 
Supervisor : Dr. Mohsen Omar 
Thesis Type : Master Thesis 
Publishing Year : 1442 AH
2020 AD 
Added Date : Monday, August 24, 2020 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عائشة هادي العمريAlamri, Aisha HadiResearcherMaster 

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