The Diet Composition and Trophic Position of Introduced Prussian Carp Carassius gibelio (Bloch, 1782) and Native Fish Species in a Turkish River

Kuzey Batı Türkiyede bulunan Karamenderes Nehrinde yaşayan yerli balık türleri üzerine potansiyel etkilerini anlamaya yardımcı olmak üzere istilacı Carassius gibelio türünün besin kompozisyonu ve trofik pozisyonu karbon ve azot kararlı izotop analizleri ile belirlenmiştir. Kararlı izotop karışım modeline göre ipliksi algler en önemli besin grubunu oluşturmuştur. İpliksi algler ve detritus sindirim kanalı içeriğinde de önemli bir oranda bulunmuştur. C. gibelio türünün trofik pozisyonu üç farklı medoda göre 2,43±0,5, 2,04±0,4 ve 3,35±0,5 olarak tahmin edilmiştir. C. gibelio türünün beslenmede yüksek derecede esneklik göstermesi ve diğer balık türlerine göre daha düşük bir trofik düzeye sahip olması istilacı bir tür olarak başarılı olmasına katkı sağlayabilir.

Türkiye nin Bir Akarsuyunda Yabancı Carassius gibelio (Bloch, 1782) ve Yerli Balık Türlerinin Besin Kompozisyonları ve Trofik Pozisyonları

Carbon and nitrogen stable isotope analyses were carried out to determine the diet composition and trophic position of the invasive species Carassius gibelio to help understand the potential impact of this species on the native fish fauna in the Karamenderes River, northwest Turkey. Filamentous algae were the most important diet component according to stable isotope mixing models. Filamentous algae and detritus formed also considerable part of the gut contents. The trophic position of C. gibelio was 2.43±0.5, 2.04±0.4 and 3.35±0.5 estimated by three different methods. The trophic niche width of this invasive species was larger than those of the native species. Our results indicate that the high dietary plasticity of C. gibelio and its lower trophic position than the other fish community members, can contribute to its success as an invasive species.

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