Benthic macroinvertebrate assemblage response to round (Neogobius melanostomus) and tubenose (Proterorhinus semilunaris) goby predation pressure

0470545 - ÚBO 2017 HU eng A - Abstract
Mikl, Libor - Adámek, Zdeněk - Všetičková, Lucie - Janáč, Michal - Roche, Kevin - Šlapanský, Luděk - Jurajda, Pavel
Benthic macroinvertebrate assemblage response to round (Neogobius melanostomus) and tubenose (Proterorhinus semilunaris) goby predation pressure.
Book of abstracts and programme. 2nd Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR). Mohács – Pécs: Carpathes Nature Foundation, 2016 - (Móra, A.; Csabai, Z.). s. 66. ISBN 978-963-12-5936-0.
[Central European Symposium for Aquatic Macroinvertebrate Research (CESAMIR) /2./. 03.07.2016-08.07.2016, Pécs]
Institutional support: RVO:68081766
Keywords : Ponto-Caspian gobies
Subject RIV: EH - Ecology, Behaviour

Ponto-Caspian gobies have significantly expanded their ranges in Europe since the 1990s, primarily through introduction by shipping at ports with subsequent spreading along navigable main rivers and tributaries. One of the main assumed impacts of invasive gobies is predation pressure on benthic invertebrates. While there have been numerous dietary studies undertaken recently, quantitative evaluations of their impact on European river ecosystems are scarce. In this study, we investigate the impact of two gobiid species, the tubenose (Proterorhinus semilunaris) and round (Neogobius melanostomus) goby, on the macroinvertebrate assemblage of a medium-sized lowland river (River Dyje, Czech Republic). Ten net bags (5×4 mm and 5×20 mm mesh size) with cleaned local rip-rap stones (mean total surface area 1.2 m2) were exposed for one month on the river bottom near the bank. Both mesh sizes allowed colonisation by macroinvertebrates, but only the larger one allowed the goby access. Two sites were investigated, the downstream one hosting both gobiid species and the upstream site with tubenose goby only. Gobies displayed strong negative impact on benthic invertebrate in nearshore habitat at both sites. While tubenose goby were able to reduce invertebrates by 15%, the decrease of invertebrate abundance made 36% in co-presence of round goby. Both gobies ingest preferentially larger invertebrates, in which leads to smaller overall body size in zoobenthos assemblages. Tubenose gobies had a significant (p<0.05) negative impact on Annelida, Gastropoda, Crustacea and on Ephemeroptera nymphs. Significant reduction of the same macroinvertebrate groups plus of Bivalvia, Odonata nymphs and Chironomidae larvae was recorded in co-presence of round goby. The results proved that gobies have a significant negative impact on benthic invertebrate in relative low density (up to 1.5 ind./m).
Permanent Link: http://hdl.handle.net/11104/0268152