Çetin KESKİN, Cemal TURAN, Deniz ERGÜDEN

Distribution of the demersal fishes on the continental shelves of the Levantine and North Aegean Seas (Eastern Mediterranean)

Çalışma Levant Denizi’nin kuzeydoğusu ve Ege Denizi’nin kuzeydoğusunda kıta sahanlıkları üzerinde bulunan demersal balıkların dağılımlarını araştırmak amacıyla yapılmıştır. Balık örnekleri dip trolü kullanılarak toplanmıştır. Levant Denizi’nde 43-121 m derinlikler arasında 15 ve Kuzey Ege Denizi’nde 14 olmak üzere toplam 29 trol çekimi yapılmıştır. Her iki bölgede trol çekimi yapılan toplam alan 1,87 km2’dir. Trol çekimlerinin gruplandırılmasında “Kümeleme” ve “metrikolmayan Çok Boyutlu Ölçekleme” analizleri kullanılmıştır. 84 tür Levant Denizi’nden ve 64 tür Kuzey Ege Denizi’nden olmak üzere toplam 114 tür elde edilmiştir. 50 tür sadece Levant Denizi’nden, 30 tür sadece Kuzey Ege Denizi’nden, 34 tür ise her iki bölgeden de yakalanmıştır. Lessepsian türlerden Upeneus moluccensis, Equulites klunzingeri, Saurida undosquamis ve yerli türlerden Pagellus erythrinus Levant Denizi’ndeki balık topluluğu içinde en yaygın türlerdir. Kuzey Ege Denizi’nde ise en yaygın türler; Serranus hepatus, Mullus barbatus, Citharus linguatula, Merluccius merluccius ve Lepidotrigla cavillone’dir. Tür komposizyonu, Kuzey Ege Denizi’nde Karadeniz’den gelen soğuk, az tuzlu ve yüksek verimlilikteki suların etkisindeyken, Levant Denizi’nde sıcak ve yüksek tuzluluktaki oligotrofik suların etkisi altındadır.

Anahtar Kelimeler:

dağılım, biyoçeşitlilik, türler, balık, Akdeniz, fauna

Levant Denizi ve Kuzey Ege Denizi (Doğu Akdeniz) kıta sahanlıklarındaki demersal balıkların dağılımı

The aim of this study was to investigate the distribution patterns of demersal fishes on the continental shelves of the north-eastern Levantine and north-eastern Aegean seas. Fish samples were collected by bottom trawl. A total of 29 hauls were carried out, 15 hauls between 43 to 121 m depth in the north-eastern Levantine Sea and 14 hauls between 65 to 100 m depth in the north-eastern Aegean Sea. The total trawled area for both region was 1.87 km2. Cluster analysis and non-metric multidimensional scaling were applied to identify hauls grouping. Among 114 fish species found, 84 were recorded in the north-eastern Levantine Sea and 64 in the north-eastern Aegean Sea. Fifty species were found exclusively from the northeastern Levantine Sea, 30 species exclusively from the north-eastern Aegean Sea and 34 species were shared by the two areas. The Lessepsian migrants, Upeneus moluccensis, Equulites klunzingeri, Saurida undosquamis, and the indigenous species Pagellus erythrinus were the most common species of fish assemblage in the north-eastern Levantine Sea. The most common species in the north-eastern Aegean Sea were Serranus hepatus, Mullus barbatus, Citharus linguatula, Merluccius merluccius and Lepidotrigla cavillone. Faunal composition in the north-eastern Levantine Sea was influenced by the oligotrophic, temperate and high saline water, while in the north-eastern Aegean Sea it was mainly affected by the outflow of cold, less saline and highly productive waters from the Black Sea.

Keywords:

distribution, biodiversity, species, fishes, Mediterranean Sea, fauna,

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