Morphological differences among the Mesopotamian spiny eel, Mastacembelus mastacembelus (banks & solander 1794), populations

Bu çalışmada morfometrik ve meristik özellikler kullanılarak Karakaya Baraj Gölü, Tohma Çayı ve Dicle Nehrindeki dikenli yılan balığı (Mastacembelus mastacembelus) populasyonlarının morfolojik özellikleri incelenmiştir. Meristik özellikler bakımından üç populasyon birbirinden farksız bulunurken, morfometrik özellikler bakımından populasyonlar arasındaki fark istatistiksel açıdan önemli bulunmuştur. Karakaya Baraj Gölü populasyonunda alt çene uzunluğu (LJL) Tohma Çayı ve Dicle Nehrindeki akarsu populasyonlarından önemli oranda daha küçük bulunmuştur. Trasformasyona tabii tutulmuş morfometrik ve meristik verilere stpwise discriminant analizi uygulanmıştır. Söz konusu discirminant analizine göre, populasyonlar arasında mofometrik farklılıklar önemli olmuştur. Discirminanat analizi Dicle ve Tohma örneklerinin %71’ini kendi grubu içerisinde doğru şekilde sınıflarken Karakaya Baraj Gölü populasyonunda %97’ini doğru olarak sınıflamıştır. Dorsal yüzgeç ışın sayısı nehir populasyonlarında, baraj gölü pupulasyonuna göre iki ışın fazla bulunmuştur. Ancak Discirminant analizinde populasyonlar meristik açıdan farklı bulunmamışlardır. Meristik özellikler bakımından sınıflama oranları Karakaya ve Tohma populasyonları için %86 ve Dicle populasyonu için ise %71 olarak hesaplanmıştır.

Anahtar Kelimeler:

yılan balığı, populasyon yapısı, Mastacembelus, morfoloji

Dikenli yılan balığı, Mastacembelus mastacembelus (banks & solander, 1794) populasyonları arasındaki morfolojik farklılıklar

Morphological status of the Mesopotamian spiny eel, Mastacembelus mastacembelus, populations from Karakay Reservoir, Tohma Stream and Tigris River were investigated using morphometric and meristic traits. Significant morphometric differences were detected among the populations, while meristic traits did not differ in three populations. Lower jaw length (LJL) was significantly smaller in Atatürk Reservoir population than the river populations of Tohma and Dicle. Stepwise discriminant analysis was applied for transformed morphometric and meristic data. In discriminant function analysis, morphometric differentiation was determined among the populations. The percentage of correctly classified individuals into their original groups was 71% for Tigris and Tohma and 97% for Karakaya populations. River populations had two more dorsal fin rays than reservoir. However, in the discriminant function analysis the populations were not clearly separated from each other in terms of meristic traits. The classification rates of meristic traits analysis were 86% for Karakaya and Tohma and 71% for Tigris populations.

Keywords:

eels, population structure, Mastacembelus, morphology,

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Bookstein, F.L. 1982. Foundation of morphometrics. Annual Review of Ecology and Systematics, 13: 451- 470.
Brinsmead, J. and Fox, M.G. 2002. Morphological variation between lake- and stream-dwelling rock bass and pumpkinseed populations. Journal of Fish Biology, 61: 1619–1638.
Britz, R. 1996. Ontogeny of ethmoidal region and hyopalatine arch in Macrognathus pancalus (Percomorpha, Mastacembeloidei), with critical remarks on mastacembeloid inter and intrarelationships. American Museum Novitates, American Museum of Natural History, New York, 3181(2): 1-18.
Britz, R. 2007. Two new species of Mastacembelus from Myanmar (Teleostei: Synbranchiformes: Mastacembelidae). Ichthyol. Explor. Freshwaters, 18: 257-268.
Coad, B.W. 1996. Zoogeography of the fishes of the Tigris- Euphrates Basin. Zool. Mid. East, 13: 51-70.
Coad, B.W. 2006. Freshwater Fishes of Iran. http://www.briancoad.com.
Delling, B. 2003. Species diversity and phylogeny of Salmo with empahasis on southern trouts (Teleostei, Salmonidae). Doctoral Dissertation, Stockholm University, Department of Zoology, Seweden.
Delling, B. 2002. Morphologıcal distinction of the marble trout, Salmo marmoratus, in comparison to marbled Salmo trutta from Rıver Otra, Norway. Cybium, 26: 283-300.
Delling, B., Crivelli, A.J., Rubin, J.F. and Berrebi, P. 2000. Morphological variation in hybrids between Salmo marmoratus and alien Salmo species in the Volarja Stream, Soca River basin, Slovenia. Journal of Fish Biology, 57: 1199-1212.
Ergüden, D. and Turan, C. 2005. Examination of Genetic and Morphologic Structure of Sea-Bass (Dicentrarchus labrax L., 1758) Populations in Turkish Coastal Waters. Turkish Journal of Veterinary and Animal Sciences, 29: 727-733.
Fitzgerald, D.G., Nanson, J.W., Todd, T.N. and Davis, B.M. 2002. Application of truss analysis for the quantification of changes in fish condition. Journal of Aquatic Ecosystem Stress and Recovery, 9: 115-125.
Froese, R. and Pauly, D. (Eds.) 2008. FishBase. World Wide Web electronic publication. www.fishbase.org, version (10/2008).
Geldiay, R. and Balık, S. 1988. Türkiye Tatlısu. Balıkları (Ders Kitabı), Ege Üniversitesi , Fen. Fakültesi Kitaplar Serisi, No: 97, Bornova, İzmir, 519 pp.
Janhunen, M., Peuhkuri, N. and Piironen, J. 2009. Morphological variability among three geographically distinct Arctic charr (Salvelinus alpinus L.) populations reared in a common hatchery environment. Ecology of Freshwater Fish, 18: 106– 116.
Neat, F.C., Lengkeek, W., Westerbeek, E.P., Laarhoven, B. and Videler, J.J. 2003. Behavioural and morphological differences between lake and river populations of Salaria fluviatilis. Journal of Fish Biology, 63: 374–387.
Oymak, S.A., Kırankaya, Ş.G. and Doğan, N. 2009. Growth and reproduction of Mesopotamian spiny eel (Mastacembelus mastacembelus Banks and Solander, 1794) in Ataturk Dam Lake (Şanlıurfa), Turkey. Journal of Applied Ichthyology, 25(4): 488-490.
Pakkasmaa, S. 2001. Morphological differentiation among local trout (Salmo trutta) populations. Biological Journal of the Linnean Society, 72: 231–239.
Parsons, K.J., Robinson, B.W. and Hrbek, T. 2003. Getting into shape: An empirical comparison of traditional truss-based morphometric methods with a newer geometric method applied to New World cichlids. Environmental Biology of Fishes, 67: 417-431.
Pinheiroa, A., Teixeira C.M., Rego, A.L., Marques, J.F. and Cabral, H.N. 2005. Genetic and morphological variation of Solea lascaris (Risso, 1810) along the Portuguese coast. Fisheries Research, 73: 67–78.
Schaefer, S.A. 1991. Morphometric investigations in cyprinid biology. In: I.J. Winfield and J.S. Nelson (Eds.), Cyprinid fishes systematics, biology and exploitation. 1st Ed., Chapman and Hall, Fish and Fisheries Series 3, London: 55-81.
Travers, R.A. 1984. A review of the Mastacembeloidei, a suborder of synbranchiform teleost fishes, Part 1: Anatomical descriptions. Bulletin of the British Museum (Natural History), Zoological Series, 46: 1- 133.
Turan, C., Ergüden, D., Gürlek, M., Başusta, N. and Turan, F. 2004. Morphometric structuring of the anchovy (Engraulis encrasicolus L.) in the Black, Aegean and northeastern Mediterranean seas. Turkish Journal of Veterinary and Animal Sciences, 28: 865-871.
Turan, C., Yalçın, Ş., Turan, F., Okur, E. and Akyurt, İ. 2005. Morphometric comparisons of African catfish, Clarias gariepinus, populations in Turkey. Folia Zoologica, 54: 165–172.
Tzeng, T.D. 2004. Morphological variation between populations of spotted mackerel (Scomber australasicus) off Taiwan. Fisheries Research, 68: 45–55.
Tzeng, C.H., Chen, C.S. and Chiu, S. 2007. Analysis of morphometry and mitochondrial DNA sequences from two Trichiurus species in waters of the western North Pacific: taxonomic assessment and population structure. Journal of Fish Biology, 70(B): 165–176.
Vreven, E.J. 2005a. Mastacembelidae (Teleostei; Synbranchiformes) subfamily division and African generic division: an evaluation. Journal of Natural History, 39: 351–370.
Vreven, E.J. 2005b. Redescription of Mastacembelus ophidium Günther, 1893 (Synbranchiformes: Mastacembelidae) and description of a new spiny eel from Lake Tanganyika. Journal of Natural History, 39: 1539–1560.