بررسي تنوع ريختي و صفات تشخيصي جمعيت‌‌هاي ماهي نازك (Chondrostoma regium) در حوضه‌هاي آبي ايران

Morphological Variations and Diagnostic Characteristics of Chondrostoma regium Populations in Iranian Inland Waters

در اين مطالعه، تنوع ريختي 162 قطعه ماهي نازك (Chondrostoma regium) جمع‌‌آوري‌‌شده از رودخانه‌هاي بهشت‌‌آباد، شلمزار، كارون، گندمان و شيخ علي‌خان (چهارمحال بختياري)، توف سفيد و سميره (اصفهان)، خرسان و بشار (كهگيلويه و بوير‌احمد)، دينورآب و الوند (كرمانشاه)، حميل (ايلام)، دوآب و كفراج (لرستان) و زاب (كردستان) بررسي شد. تعداد 27 صفت اندازشي و 11 صفت شمارشي اندازه‌گيري و شمارش شد. براي بررسي تنوع ريختي بين جمعيت‌‌هاي مطالعه‌‌شده، ويژگي‌‌هاي اندازشي و شمارشي با استفاده از آناليز واريانس يك‌طرفه، آناليز كروسكال - واليس، تحليل مؤلفه‌هاي اصلي (PCA) و تحليل همبستگي كانوني (MANOVA/CVA) تجزيه و تحليل شد. براساس نتايج تجزيه و تحليل واريانس يك‌‌طرفه، 20 ويژگي اندازشي اصلاح‌‌شده و 10 ويژگي شمارشي داراي تفاوت معني‌دار بود (0/05

In the present study, the morphological variations of 162 specimens of Chondrostoma regium (Heckel, 1843) collected from the Beheshtabad, Shalmzar, Karoun, Gandman, Sheikh Ali Khan (Chaharmahal-e Bakhtiari Province), Tof Sefid and Seimareh (Isfahan Province), Khersan, Beshar (Kohgoluyeh and Boyer-Ahmad Province), Dinevarab, Alvand (Kermanshah Province), Homeil (Ilam Province), Doab, Kafraj (Lorestan Province) and Zab (Kurdistan Province) were analyzed. A total of 27 morphometric and 11 meristic characteristics were assessed. To investigate the morphological variations between the studied populations, morphometric and meristic characteristics were analyzed using one-way analysis of variance, Kruskal-Wallis analysis, Principal Component Analysis (PCA), Multivariate Analysis of Variance (MANOVA), and Canonical Variates Analysis (CVA). The results of the study showed that 20 morphometric and 10 meristic characteristics had significant differences (p < 0.05). Among the morphometric characteristics, the first two components showed 55.2% of the variation between the individuals. CVA analysis of morphometric characteristics showed that the populations had a great overlap and only the Zab population was separated from the others, whereas in the meristic characteristics, most of the populations were separated from each other. Based on the results, the studied populations of Brond-snout fish showed significant morphological differences and in this species. Meristic characteristics had a higher discriminability than morphometric characteristics.