Mevlüt GÜRLEK, Cemal TURAN, Funda TURAN, Deniz ERGÜDEN

Genetic and morphologic structure of Liza abu (Heckel, 1843) populations from the ricers orontes, Euphrates and Tigris

Asi, Fırat ve Dicle nehirleri Liza abu populasyonları toplanan örneklerle morfolojik ve genetik olarak incelendi. Genetik karşılaştırma yapmak üzere kullanılan allo-enzim elektroforezi ve morfolojik karşılaştırma yapmak için kullanılan Truss ağı sistemi aynı örnekler üzerinde eşzamanlı olarak kullanıldı. L. abu populasyonları arasında çok önemli derecede morfolojik farklılıklar gözlendi. Morfolojik karakterler bakımından balıkların kendi orijinal grubuna doğru olarak sınıflandırılması % 100 olarak yüksek bulundu. Kümelerarası korelasyon analizinde, varyasyonların kümeleştirilmesi sonucu; Dicle stoğunün Asi ve Fırat stoklarından çok farklı olduğu gözlenmiş, Fırat stoğunün Asi ve Dicle stokları arasında bir yer aldığı, fakat Asi stoğuna daha yakın olduğu gözlenmiştir. Gözlenen fenotipik yapı, stokların coğrafik uzaklıkları ile morfolojik farklılığı arasında yakın bir ilişki olduğunu işaret etmektedir. Fakat elde edilen genetik veriler gözlenen morfolojik farklılığı desteklememektedir. Genetik analiz için 5 enzim (ICD, PGM, ME, MDH, G3PDH) sistemi (6 losi) kullanılmıştır. Kullanılan bütün losiler mbnomorfik çıktığı için populasyonlar arasında herhangi bir genetik farklılık gözlenememiştir.

Asi, Fırat ve Dicle Nehirlerinde bulunan Liza abu (Heckel, 1843) populasyonlarının genetik ve morfolojik yapısı

Liza abu stocks from the rivers Orontes, Euphrates and Tigris were investigated using genetic and morphometric data. Allozyme electrophoresis for genetic comparison and the truss network system for morphometric comparison were simultaneously applied to the same sample set. Highly significant morphological differences were observed between the 3 Liza abu stocks. The correct classification of individuals into their original samples for morphological characters was very high (100% of individuals). In discriminant function analyses, plotting discriminant functions revealed high isolation of the 3 stocks; the Tigris stock was very isolated from the Euphrates and Orontes stocks, and the Euphrates stock was located between the Tigris and Orontes stocks, but was closer to the Orontes stock." The pattern of phenotypic discreteness suggests a direct relationship between the extent of phenotypic divergence and geographic separation. However, genetic data do not support the detected morphometric variations. A 5 enzyme system (ICD, PGM, ME, MDH, G3PDH) composed of 6 loci was used to determine genetic comparison. All the loci were monomorphic and therefore there was no genetic divergence among the stocks.

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