Türkiye’deki istilacı tatlısu medüzü Craspedacusta sowerbii (Lankester, 1880): Yeni lokalite kaydı, habitat limnoekolojisi ve Orta Doğu ve Balkanlar’daki dağılımı

Öz

Mezotrofik bir baraj gölünde (Ürkmez Baraj Gölü, batı Anadolu, Türkiye) yapılan çalışma esnasında istilaci tatlısu medüzü (Craspedacusta sowerbii Lankester, 1880) için yeni bir lokalite bulunmuştur. Çalışma baraj gölünün limnoekolojik özellikleri üzerineydi ve Mart 2014 ile Şubat 2015 tarihleri arasında aylık olarak yapıldı. Çalışma yapılan habitatın bazı limnolojik özellikleri (fizikokimyasal parametreler, fitoplankton kompozisyonu ve trofik durum) sunulmuştur. Ağustos v Eylül 2014 tarihlerinde medüz bireyleri yüzeyin hemen altında olacak şekilde gözlemlenmişlerdir (3-4 birey/m2). Çalışmanın geri kalan dönemlerinde baraj gölünün limnetic bölgesinde medüz bireylerine rastlanılamamıştır. C. sowerbii Türkiye’nin tatlısularında nadir görülen bir türdür. Mevcut kayıt, türün Türkiye dağılımndaki en batı noktayı teşkil etmektedir. Çalışmada ayrıca, türün Güneydoğu Avrupa ve Orta Doğu’daki dağılımı gözden geçirilmiş olup, türün belirtilen bölgelerdeki güncel dağılımını gösteren bir harita sunulmuştur.

Anahtar Kelimeler

• istilacı tür
• tatlısu medüzü
• baraj
• coğrafik dağılım haritası

Invasive freshwater jellyfish Craspedacusta sowerbii (Lankester, 1880) in Turkey: New locality record and habitat limnoecology, with an overview of distributional data in the Middle East and Balkans

Öz

A new locality for the invasive freshwater jellyfish (Craspedacusta sowerbii Lankester, 1880) was found during a study conducted in a mesotrophic dam lake (Ürkmez Reservoir, western Anatolia, Turkey). The study was focused on the limnological characteristics of the reservoir and conducted at monthly intervals between March 2014 and February 2015. Some limnological characteristics (physicochemical parameters, phytoplankton composition, and trophic status) of the investigating area are presented. In August and September 2014, jellyfish specimens were observed just beneath the surface (3-4 spec/m2). In the remaining period of the study, no jellyfish specimens were found in the limnetic zone of the reservoir. C. sowerbii has been rarely observed in Turkish freshwaters. The present record is the westernmost point of its distribution in Turkey. An overview of its distribution in South-Eastern Europe and the Middle East, and a map showing the actual distribution in the mentioned area was given.

Anahtar Kelimeler

• invasive species
• freshwater jellyfish
• reservoir
• geographical distributional data

Kaynakça

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