Özcan GAYGUSUZ, Hamdi AYDIN, Çiğdem Gürsoy GAYGUSUZ, Nildeniz TOP, Ali Serhan TARKAN, Özgür EMİROĞLU

Invasion of freshwater bodies in the Marmara region (northwestern Turkey) by nonnative gibel carp, Carassius gibelio (Bloch, 1782)

Bu çalışma Marmara Bölgesi’nde gümüşi havuz balığı için yeni dağılım alanlarını rapor etmeyi, balığın istila hızını ve istilacı karakterinin iyi bir göstergesi olan cinsiyet oranlarını belirlemeyi amaçlamaktadır. Ayrıca Marmara Bölgesi içsularındaki gümüşi havuz balığı varlığının tesadüfi (şans eseri) olup olmadığı ve zamanla sayısının artıp artmadığı test edildi. Gümüşi havuz balığı için çoğu durgun su ortamı olmak üzere 14 yeni bölge tespit edildi. Gümüşi havuz balığının Marmara Bölgesi’ne ilk girişinden (1980’lerin başı) günümüze kadar geçen sürede her yıl ortalama 1 yeni alanı istila ettiği bulundu (1.17, gümüşi havuz balığı tarafından istila edilen saha sayısı = 35). Çalışılan 12 popülasyonun 10’nunda dişiler erkeklere göre önemli derecede fazlaydı, sadece iki populasyonda cinsiyet oranı eşitti. Gümüşi havuz balığının sayısındaki artış ilk aşılanmasından günümüze kadar geçen zamanla doğru orantılıydı (y = 1.34x – 2651.1, F = 47.41, P < 0.001, rs = 0.95). Yerel türlerin korunması ile ilgili sorunlar tartışıldı.

Marmara Bölgesi (Kuzey-Batı Türkiye) içsularının egzotik gümüşi havuz balığı Carassius gibelio (Bloch, 1782) tarafından istilası

The aim of this study was to learn the invasion speed and sex ratio, which would be indicative of invasive character, of a nonnative fish species, gibel carp, by reporting its new localities in the Marmara region of northwestern Turkey. Whether the occurrence of gibel carp in freshwater bodies of the Marmara region was random (i.e. chance element) was tested. The question of population increase since first introduction was also examined. Among 14 new locations for gibel carp found during this study, the majority were in mostly lentic ecosystems. The invasion rate of gibel carp in the Marmara region, since its first introduction in the early 1980s, is approximately 1 new water body per year (1.17; number of sites invaded by gibel carp = 35). Females significantly outnumbered males in 10 out of the 12 populations studied, with the sex ratio deviating from unity (1:1) in all populations except 2. The regional extent of gibel carp occurrence increased with the number of years since first introduction (y = 1.34x – 2651.1, F = 47.41, P < 0.001, rs = 0.95). The implications for conservation of native fishes are discussed.

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