SELÇUK BERBER, Harun YILDIZ, Özcan ÖZEN, MEHMET MENDEŞ, Mustafa PALAZ

Temporary timing of reproductive traits with respect to environmental variables in Turkish crayfish in yenice reservoir

Bu çalışma, Yenice Merkez Sulama Göleti’nde bulunan tatlısu istakozlarının (Astacus leptodactylus) bazı morfometrik ve üreme özellikleri ile su kaynağının bazı fiziko-kimyasal parametreleri arasındaki ilişkilerin belirlenebilmesi amacıyla yapılmıştır. Bu doğrultuda yapılan MDS analizleri sonucunda elde edilen stres ve korelasyon katsayıları, kullanılan modelin uygunluğunun ölçütleridir. Söz konusu katsayılar incelendiğinde tatlısu istakozlarında, morfometrik özellikler, üreme özellikleri ile su kalitesi parametreleri arasındaki ilişkilerin farklı oranlarda açıklanabildiği tespit edilmiştir. Bu manada araştırma sonuçlarına göre fekondite ve sperm üretimi gibi üreme özelliklerinin, su kalitesi parametrelerinden sıcaklık, magnezyum, kondaktivite, çözünmüş oksijen ile morfometrik özelliklerden de abdomen ağırlığı, karapaks ağırlığı, abdomen genişliği, karapaks genişliği, abdomen boyu ve karapaks boyu’nun özellikle çözünmüş oksijen, magnezyum, kalsiyum ve sıcaklık ile yakin ilişki içerisinde oldukları belirlenmiştir. Tespit edilen ilişkilerin gerek kültür ortamlarında anaç seçimi ve verimli popülasyon yönetimlerinde gerekse aşılama suretiyle oluşturulan popülasyonlar için verimli olabilecek su kaynaklarının seçiminde göz önünde bulundurulduğunda oldukça önemli rol oynayabilecekleri düşünülmektedir.

Anahtar Kelimeler:

fizikokimyasal özellikler, Decapoda, Astacus leptodactylus, Türkiye, su sıcaklığı, rezervuarlar, üreme, morfometri, morfoloji, magnezyum, çevresel etki, çözünmüş oksijen, kerevit, kalsiyum

This study was carried out to determine the relationships between physicochemical parameters and morphometric and reproduction features of the crayfishes (Astacus leptodactylus) in Yenice Central Irrigation Pond. Results of MDS analysis revealed that the relationships between physicochemical parameters and morphometric features and reproduction features in crayfishes could be explained at diff erent rates. Reproduction features such as fecundity and sperm production, were within a close relationship with temperature, magnesium, conductivity, dissolved oxygen, and the abdomen weight, carapace weight, abdominal width, carapace width, abdomen length, carapace length from morphometric features were within a close relationship especially with dissolved oxygen, magnesium, calcium, and temperature. These relationships could play an important role while considering the selection of maternal females for cultural environments and for the management of productive population, and for the selection of water sources that can be eff ective for populations that is generated by vaccination.

Keywords:

physicochemical properties, Decapoda, Astacus leptodactylus, Turkey, water temperature, reservoirs, reproduction, morphometrics, morphology, magnesium, environmental impact, dissolved oxygen, crayfish, calcium,

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