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Document Type |
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Thesis |
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Document Title |
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STUDIES ON THE ECOLOGY OF ZOOPLANKTON COMMUNITY IN OBHUR CREEK, CENTRAL RED SEA دراسات على بيئة مجتمع الهائمات الحيوانية في شرم أبحر، وسط البحر الأحمر |
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Subject |
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Faculty of Marine Sciences |
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Document Language |
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Arabic |
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Abstract |
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Abstract Temporal and diel variability in zooplankton abundance were studied from a central Red Sea station in front of Obhur Creek, central Red Sea. Temperature and salinity reflect the hot and high saline condition of the Red Sea. Inorganic nutrients and phytoplankton biomass (chlorophyll a) proven oligotrophic characteristics of the region with occasional increase in their values. Lower phytoplankton densities (246.80±306.98× 103 cells m-3) obtained throughout the study period with an unusual proliferation in May (1082.34 × 103 cells m-3). Diatoms dominated the total phytoplankton abundances with occasional dominance of dinoflagellates, during summer. Higher abundances during May were mainly due to the proliferation of a pennate diatom. Total zooplankton abundances showed variation in their both temporal (1523±1377 to 23171± 9704 individuals m-3) and diel values (2694±3482 to 9009±6851 individuals m-3). On a seasonal basis, higher abundances were obtained towards cooler period, while on a diel basis the maximum abundances were obtained mainly from the evening and midnight collections. Copepoda was the dominant zooplankton group that contributed significantly to total the zooplankton (79.5%). Cladocerans, chaetognaths, appendicularians and crab larvae were also represented considerable percentages of total zooplankton (4.8%, 1.7%, 1.5% and 2.8%, respectively). Similar to the total zooplankton abundances, the different dominant groups exhibited clear seasonal and diel variations. In contrary, on a temporal basis the dominant calanoid copepod studied, the Centropages spp. showed an affinity towards moderate temperature and exhibited its higher abundances during spring and autumn. However, its diel variability was similar to the other zooplankton groups exhibiting higher abundances towards the evening and midnight. For a first of its kind from the Red sea, the current study detailed the temporal and diel variability of mesozooplankton . |
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Supervisor |
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Dr. Mohsen Omar |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1444 AH
2022 AD |
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Added Date |
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Monday, February 27, 2023 |
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Researchers
| حنان سلمان الحربي | Alharbi, Hanan Salman | Researcher | Master | |
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