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Spatio-temporal variations of zooplankton community in the hypersaline lagoon of Bardawil, North Sinai, Egypt

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Author
Mageed, A.A.A.
Date
2006

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Alternative Title
التغير المكانى والزمانى لمجتمع الهائمات الحيوانية فى جونة البردويل المالحة بشمال سيناء – مصر
Abstract
Bardawil Lagoon is a shallow oligotrophic hypersaline lake, located at the northern periphery of Sinai peninsula-Egypt, connected to SE Mediterranean Sea through two main openings known as Boughazes. Distribution of zooplankton in Bardawil Lagoon during 2004 was studied, not only in space and time but also with reference to species assemblages and environmental factors. Copepoda, Protozoa, and Mollusca were dominating the lagoon zooplankton community during the period of study with 58 identified forma. Zooplankton stock peaked during August and October with severe depletion in spring. Spatially, the maximum density occurred near the sea opening I. The lowest density and species richness were noticed at stations with high salinity. The community composition was highly changed with time series. Twenty new taxa were recorded during the study, whereas thirty three taxa disappeared from the lagoon along twenty years.
تعتبر جونة البردويل بحيرة عالية الملوحة، فقيرة فى الانتاجية الاولية، وقليلة العمق. وتقع هذه الجونة فى اقصى شمال جزيرة سيناء-مصر. وتتصل بجنوب شرق البحر المتوسط من خلال فتحتين. وقد تمت دراسة توزيع الهائمات الحيوانية خلال عام 2004 شهريا. وسجل 58 نوعا من الهائمات الحيوانية. وكانت مجدافيات الارجل والاوليات الحيوانية والرخويات هى الاكثر سيادة فى البحيرة. وبخاصة فى شهرى أغسطس وأكتوبر، بينما كان هناك فقر كبير فى كثافة هذه الكائنات فى ربيع ذلك العام. كما كانت أعلى كثافة للهائمات الحيوانية فى المحطات القريبة من البوغاز الغربى. وبينت الدراسة ان الملوحة كانت هى العامل المُحدد لتغير كثافة وتنوع الهائمات الحيوانية حيث تناسبت معها عكسيا. ظهر عشرون نوعا فى جونة البردويل أثناءالدراسة لم يتم تسجيلهم من قبل بينما اختفى ثلاثة وثلاثون نوعا على مدار عشرون عاما.
Journal
Egyptian journal of aquatic research
Volume
32
Issue/Article Nr
1
Publisher or University
National Institute of Oceanograhy and Fisheries (NIOF)
URI
http://hdl.handle.net/1834/1456
Collections
Egyptian Journal of Aquatic Research
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