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A contribution to study of molluscs in the lower reach of Alkebir Alshimaly river and some of it's tributaries Primary study

مساهمة في دراسة رخويات المجرى السفلي لنهر الكبير الشمالي و بعضاً من روافده دراسة أولية

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 Publication date 2015
and research's language is العربية
 Created by Shamra Editor




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Six water stations were chosen along the lower reach section of AlKebir ALShimaly river and some of it's tributaries, differing in their biotic and abiotic features. Water and animal samples were collected bimonthly during spring, summer & autumn and monthly during winter during the period 25/8/2013 – 26/8/2014. Seventeen species of freshwater molluscs were identified in all stations, fifteen belonging to Gastropoda (6 of Prosobranchia & 9 of Pulmonata) and 2 belonging to Bivalvia, one of it (Corbicula fluminea) was recorded for the first time in Syrian Arab Republic. We focused on in this study on the station ( Mafraq Quesmeen) that we studied it's chemical and physical properties of the water and we identified 11 mollusc species and the most frequency of it was Melanopsis praemorsa and it's frequency rate was 46.48% and it was the most constant in all continuous samples and it was 100%


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Research summary
تتناول هذه الدراسة الرخويات المائية في المجرى السفلي لنهر الكبير الشمالي وبعض روافده. تم تحديد ست محطات مائية تختلف في خصائصها الحيوية واللاحيوية، وتم جمع العينات المائية والحيوانية بمعدل مرتين شهرياً خلال فصول الربيع والصيف والخريف، ومرة واحدة شهرياً خلال فصل الشتاء، وذلك لمدة عام من آب 2013 وحتى آب 2014. تم التعرف على 17 نوعاً من الرخويات المائية العذبة، منها 15 نوعاً تنتمي إلى صف بطنيات القدم ونوعان ينتميان لصف تثائيات المصراع. تم تسجيل النوع Corbicula fluminea لأول مرة في سوريا. ركزت الدراسة على محطة مغرق ضمين، حيث تم تحديد 11 نوعاً من الرخويات، وكان النوع Melanopsis praemorsa الأكثر تكراراً بنسبة 46.53% والأكثر ثباتاً بنسبة 100%. تم تحليل الخصائص الفيزيائية والكيميائية للمياه في المحطة، وتبين أن المياه كانت غنية بالأكسجين المذاب وكانت حموضتها قريبة من الاعتدال. أوصت الدراسة بمتابعة الدراسات البيئية والتصنيفية للرخويات المائية في مختلف الأوساط المائية العذبة في الساحل السوري، ورسم خارطة لتوزع الأنواع الرخوية، وإجراء دراسات صحية لتحديد الطفيليات التي تستضيفها هذه الرخويات والتي تسبب أمراضاً للإنسان والحيوانات ذات القيمة الاقتصادية.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة جداً في مجال علم الأحياء المائية، حيث تسلط الضوء على تنوع الرخويات في المجرى السفلي لنهر الكبير الشمالي. ومع ذلك، يمكن توجيه بعض الانتقادات البناءة لتحسين الدراسات المستقبلية. أولاً، كان من الممكن توسيع نطاق الدراسة ليشمل فصولاً زمنية أطول للحصول على بيانات أكثر شمولية. ثانياً، لم يتم التطرق بشكل كافٍ إلى تأثير الأنشطة البشرية على تنوع الرخويات في المنطقة المدروسة. أخيراً، كان من الممكن استخدام تقنيات تحليلية أكثر تطوراً للحصول على نتائج أكثر دقة وتفصيلية. على الرغم من هذه النقاط، فإن الدراسة تقدم مساهمة قيمة في فهم التنوع البيولوجي للرخويات في المنطقة وتوفر قاعدة بيانات مهمة للباحثين في المستقبل.
Questions related to the research
  1. ما هي الفترة الزمنية التي غطتها الدراسة لجمع العينات؟

    تم جمع العينات من آب 2013 وحتى آب 2014.

  2. كم عدد أنواع الرخويات التي تم تحديدها في الدراسة؟

    تم تحديد 17 نوعاً من الرخويات المائية العذبة.

  3. ما هو النوع الذي تم تسجيله لأول مرة في سوريا؟

    تم تسجيل النوع Corbicula fluminea لأول مرة في سوريا.

  4. ما هي التوصيات التي قدمتها الدراسة؟

    أوصت الدراسة بمتابعة الدراسات البيئية والتصنيفية للرخويات المائية، ورسم خارطة لتوزع الأنواع الرخوية، وإجراء دراسات صحية لتحديد الطفيليات التي تستضيفها هذه الرخويات.


References used
ADAM, W. Mollusquesterrestres et dulcioles. Faunade Belgigue. Inst, Rey, Sci, Nat pelg. 1960, 1 ,402p
BIJ DE VAATE,A. Hulea,O . Range extension of the Asiatic clam Corbicula fluminea ( M ü lle r 1774) in the River Danube: first record from Romania . Lauterbornia 38: 23-26p, D-86424 Dinkelscherben, 2000-06-15
CIUTTI,F. CAPPELLETTI,C . First record of Corbicula fluminalis (Müller, 1774) in Lake Garda (Italy), living in sympatry with Corbicula fluminea (Müller, 1774) .J. Limnol., 68(1): 2009 ,162-165p
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