Naslov
Distribution, abundance and condition of invasive Ponto-Caspian gobies Ponticola kessleri (Günther, 1861), Neogobius fluviatilis (Pallas, 1814), and Neogobius melanostomus (Pallas, 1814) in the Sava River basin, Croatia

Autori
Jakovlić, Ivan ; Piria, Marina ; Šprem, Nikica ; Tomljanović, Tea ; Matulić, Daniel ; Treer, Tomislav

Izvornik
Journal of applied ichthyology (0175-8659) 31 (2015), 5; 888-894

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
non-native ; invasive potential ; adverse impact ; CPUE ; Proterorhinus semilunaris ; Babka gymnotrachelus

Sažetak
Distribution, population density, invasive potential and adverse impacts of invasive Ponto- Caspian gobies on native fauna in the River Sava basin remain unknown. 23 locations in the Sava basin were sampled during a three year period (2011 – 2013). Among the five Ponto-Caspian goby species previously reported in Croatia, only Neogobius fluviatilis (291), Neogobius melanostomus (177) and Ponticola kessleri (21) specimens were collected. Proterorhinus semilunaris and Babka gymnotrachelus were not found. N. fluviatilis was dominant among the invasive gobies at the majority of locations and almost omnipresent (apart from the upper Sava reaches) in the Sava basin. N. melanostomus was only found in the navigable Sava reaches, but its distribution range still seems to be expanding. P. kessleri was only found in 2011 at three locations in the lower Sava reaches, leaving the question of the invasion successfulness open. No significant (p>0.05) increase in average catch- per-unit-effort (CPUE) values was observed during the three year period. There is some evidence that a decline in Gobio gobio populations might be expected in response to increasing N. fluviatilis population densities. The findings suggest that further range expansions by the Ponto-Caspian gobies can be expected in Croatia and the implementation of measures to limit their spreading should be considered.

Izvorni jezik
Engleski

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