Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman
The contribution of three different cell size classes of picoplankton: 0.74-2 μm, nanoplankton:2–20 μm and microplankton, >20 μm of the phytoplankton population and their relationship to environmental conditions were studied over two annual cycles at one station in Bandar Khyran Bay, Sea of Om...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Iranian Fisheries Science Research Institute
2015
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| Online Access: | http://psasir.upm.edu.my/id/eprint/46234/ http://psasir.upm.edu.my/id/eprint/46234/1/Seasonal%20variability%20of%20size-classes%20of%20phytoplankton%20biomass%20in%20a%20sub-tropical%20embayment%2C%20Muscat%2C%20Sea%20of%20Oman.pdf |
| _version_ | 1848850620835954688 |
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| author | Al-Hashmi, Khalid Claereboudt, M. Piontkovski, Sergey Al Azri, Adnan N. Amin, S. M. |
| author_facet | Al-Hashmi, Khalid Claereboudt, M. Piontkovski, Sergey Al Azri, Adnan N. Amin, S. M. |
| author_sort | Al-Hashmi, Khalid |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The contribution of three different cell size classes of picoplankton: 0.74-2 μm, nanoplankton:2–20 μm and microplankton, >20 μm of the phytoplankton population and their relationship to environmental conditions were studied over two annual cycles at one station in Bandar Khyran Bay, Sea of Oman, from May 2006 to August 2008. Nanoplankton was the most important class contributing 54.4% to total Chl a (range 6-82%). Its seasonal highest concentrations was during the cold periods when temperature ranged from 28-29 °C in fall and near 24 C in winter when the supply of nutrients was sufficient to sustain their growth. Picoplankton had the second level of the contribution, comprising (23.5%, range 4-74 %) of the total Chl a. and their concentration was generally constant (0.04-.06 μg l–1) throughout the study period. The drop of picoplankton population coincided with an increase in the microplankton and nanoplankton populations indicating a high grazing pressure exerted on the picoplankton population. Microplankton size-class occupied the third level of the contribution comprising (22.2%, range 3-65 %). Their general concentration was below 0.1 μg l–1 and only dominant when temperatures were lowest and nitrate, nitrite, silicate and phosphate concentrations were the highest. The temporal variability observed was associated with changes in the nanaoplankton indicating that in some cases, it is the small fraction of phytoplankton that drives changes in abundances and productivity. |
| first_indexed | 2025-11-15T10:09:11Z |
| format | Article |
| id | upm-46234 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T10:09:11Z |
| publishDate | 2015 |
| publisher | Iranian Fisheries Science Research Institute |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-462342022-06-16T08:22:25Z http://psasir.upm.edu.my/id/eprint/46234/ Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman Al-Hashmi, Khalid Claereboudt, M. Piontkovski, Sergey Al Azri, Adnan N. Amin, S. M. The contribution of three different cell size classes of picoplankton: 0.74-2 μm, nanoplankton:2–20 μm and microplankton, >20 μm of the phytoplankton population and their relationship to environmental conditions were studied over two annual cycles at one station in Bandar Khyran Bay, Sea of Oman, from May 2006 to August 2008. Nanoplankton was the most important class contributing 54.4% to total Chl a (range 6-82%). Its seasonal highest concentrations was during the cold periods when temperature ranged from 28-29 °C in fall and near 24 C in winter when the supply of nutrients was sufficient to sustain their growth. Picoplankton had the second level of the contribution, comprising (23.5%, range 4-74 %) of the total Chl a. and their concentration was generally constant (0.04-.06 μg l–1) throughout the study period. The drop of picoplankton population coincided with an increase in the microplankton and nanoplankton populations indicating a high grazing pressure exerted on the picoplankton population. Microplankton size-class occupied the third level of the contribution comprising (22.2%, range 3-65 %). Their general concentration was below 0.1 μg l–1 and only dominant when temperatures were lowest and nitrate, nitrite, silicate and phosphate concentrations were the highest. The temporal variability observed was associated with changes in the nanaoplankton indicating that in some cases, it is the small fraction of phytoplankton that drives changes in abundances and productivity. Iranian Fisheries Science Research Institute 2015 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/46234/1/Seasonal%20variability%20of%20size-classes%20of%20phytoplankton%20biomass%20in%20a%20sub-tropical%20embayment%2C%20Muscat%2C%20Sea%20of%20Oman.pdf Al-Hashmi, Khalid and Claereboudt, M. and Piontkovski, Sergey and Al Azri, Adnan and N. Amin, S. M. (2015) Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman. Iranian Journal of Fisheries Science, 14 (1). pp. 136-149. ISSN 1562-2916; ESSN: 2322-5696 https://jifro.ir/article-1-1829-en.html |
| spellingShingle | Al-Hashmi, Khalid Claereboudt, M. Piontkovski, Sergey Al Azri, Adnan N. Amin, S. M. Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title | Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title_full | Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title_fullStr | Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title_full_unstemmed | Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title_short | Seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, Muscat, Sea of Oman |
| title_sort | seasonal variability of size-classes of phytoplankton biomass in a sub-tropical embayment, muscat, sea of oman |
| url | http://psasir.upm.edu.my/id/eprint/46234/ http://psasir.upm.edu.my/id/eprint/46234/ http://psasir.upm.edu.my/id/eprint/46234/1/Seasonal%20variability%20of%20size-classes%20of%20phytoplankton%20biomass%20in%20a%20sub-tropical%20embayment%2C%20Muscat%2C%20Sea%20of%20Oman.pdf |