Aquatic Sciences

, 81:29 | Cite as

An invasive species, Carassius gibelio, alters the native fish community through trophic niche competition

  • Şükran Yalçın ÖzdilekEmail author
  • Nurbanu Partal
  • Roger I. Jones
Research Article


Carbon and nitrogen stable isotope analyses were used to determine isotopic niche width of the invasive fish species Carassius gibelio to help assess the niche overlap and potential impact of this species on the native fish fauna in the Karamenderes River, northwest Turkey. C. gibelio had the highest niche area of the coexisting species. The greatest overlap of isotopic niche was between C. gibelio and Mugil cephalus in the river mouth. The freshwater species displayed similar patterns when taking into consideration their relative abundance and isotopic overlap. While C. gibelio is likely to outcompete some species at some localities, the species was found co-occurring with others by maximum tolerable overlap degree and apparently utilised vacant niche space at some stations. Overall our results indicate that C. gibelio has extensive niche overlap with the native fish species making it a strong competitor, and because of its high abundance and high niche width this invasive species represents a serious threat to the native fish fauna, particularly in the river mouth.


Feeding ecology Fish Stable isotopes Invasive 



This project was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) 111Y280 coded project. We thank fisherman Selahattin EROL for help sampling with the B.12.0BSÜ. and 65465693-605/20.08.2014 numbered legal permissions. We thank the project team for valuable support in the field studies. We also thank two anonymous reviewers for their helpful comments.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Biology, Science and Letters FacultyÇanakkale Onsekiz Mart UniversityÇanakkaleTurkey
  2. 2.Graduate School of Natural and Applied SciencesÇanakkale Onsekiz Mart UniversityÇanakkaleTurkey
  3. 3.Department of Biology and Environmental ScienceUniversity of JyvaskylaJyväskyläFinland

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