Expansion of round gobies in a non-navigable river system

0480826 - ÚBO 2018 RIV DE eng J - Journal Article
Šlapanský, Luděk - Janáč, Michal - Roche, Kevin Francis - Mikl, Libor - Jurajda, Pavel
Expansion of round gobies in a non-navigable river system.
Limnologica. Roč. 67, November (2017), s. 27-36. ISSN 0075-9511. E-ISSN 1873-5851
R&D Projects: GA ČR(CZ) GAP505/11/1768
Institutional support: RVO:68081766
Keywords : Impact * Invasive species * Neogobius melanostomus * Pioneer fish * Population characteristics * Proterorhinus semilunaris
OECD category: Marine biology, freshwater biology, limnology
Impact factor: 1.814, year: 2017

A number of Ponto-Caspian Gobiid species have greatly increased their geographical ranges over recent decades. Most expansion studies to date, however, have focused on navigable waterways. In this study, we present a summary of six-years (2008–2013) monitoring of round goby Neogobius melanostomus expansion along two connected non-navigable rivers. Contiguous range expansion was observed in both rivers, with dispersal rate ranging from 1.2 to 3.2 km/year. Gobies at newly invaded sites ranged from 20 to 117 mm, with both juveniles and adult fish observed. Though the data did not allow us to see any consistent pattern in the first years after detection, there was some evidence for a shift to a female-biased, juvenile-dominated population over time. While the abundance of non-native tubenose goby Proterorhinus semilunaris appeared to be negatively influenced by round goby establishment, diversity of nearshore native fish showed no evidence of dramatic decline attributable to round goby.
Permanent Link: http://hdl.handle.net/11104/0276496