No significant negative impact on native fish species during first years of colonization by Ponto-Caspian gobies
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1 No significant negative impact on native fish species during first years of colonization by Ponto-Caspian gobies Hugo Verreycken, Hans Van Calster, Luc De Bruyn, Tim Adriaens
2 OUTLINE Introduction Invasion by PC gobies In Flanders Border Meuse PC gobies invasion Habitat, characteristics Material and methods Fish monitoring Dataset & statistics Results Results fish assessments Trends in fish community Impact of PC gobies? Conclusions
3 INTRODUCTION Invasion of Ponto- Caspian gobies in Flanders Round goby Tubenose goby Bighead goby
4 INTRODUCTION Invasion of Ponto- Caspian gobies in Flanders In Flanders (North-Belgium) Round goby Neogobius melanostomus (2010) Tubenose goby Proterorhinus semilunaris (2010) Bighead goby Ponticola kessleri (2012) Current distribution
5 Round goby
6 Tubenose goby
7 Bighead goby
8 Did native fish community in Border Meuse change as a result of the emergence of Ponto-Caspian gobies?
9 INTRODUCTION - River Meuse R. Meuse (935 km) originates in France, runs northwards through Wallonia and Flanders and ends in the Netherlands (Hollands Diep) Border Meuse constitutes the border between Belgium (Flanders) and the Netherlands over a length of 44 km. Border Meuse has a natural course, and is not navigable
10 INTRODUCTION - Border Meuse Width m, depth m Substrate: sand, gravel, small and large boulders, riprap Banks: often strengthened with riprap Discharge: average year discharge (2015) 205 m 3 /sec (between m 3 /sec) During dry periods discharge may be very low (e.g. May Aug 2015 = 62.2 m 3 /sec) Water velocity in the River Meuse is very variable in time and sites
11 M&M - Fish monitoring in Meuse Data obtained from fish stock assessments through electric fishing (wading or from boat) along the Border Meuse Complete dataset includes data collected between 1998 and 2015 (not sampled all years) and 21 fishing locations Not each location is sampled every occasion (max = 8)
12 M&M - Complete dataset Town Site number Total fish/site Dilsen-Stokkem Kinrooi Lanaken Maaseik B C Maasmechelen Voeren Total fish/year
13 M&M - Statistical analysis Exploratory analysis Complete dataset (21 sites) Mixed models analysis (site = random effect) Dataset I (12 sites, sites sampled only once were removed) Response Species richness Individual species Explanatory variable: year (piece-wise before and after PC goby invasion) Dataset II (6 sites, sampled all consecutive years since 2012) Response Density of a typical species of Border Meuse + PC goby Decline in typical species? (interaction species x year)
14 M&M - Dataset I Town Site Total number fish/site Dilsen-Stokkem Kinrooi Lanaken Maaseik Maasmechelen Voeren Total fish/year
15 M&M - Dataset II Total Town Site number fish/site Dilsen-Stokkem Kinrooi Lanaken Maaseik Maasmechelen Total fish/year
16 RESULTS Fish assessments 37 fish species ( specimens) over 21 sites and 8 sampling years Most common: eel (2193), roach (2178), chub (1852), perch (1662), round goby (1460), tubenose goby (745), gudgeon (620) Rheophilic species: nase, barbel, chub, dace Benthic species: stone loach, bullhead, gudgeon Eurytopic species: roach, perch, eel, ruffe Non-native species: asp, Ponto-Caspian gobies Tubenose goby Proterorhinus semilunaris (since 2010?) Round goby Neogobius melanostomus (2013) Bighead goby Ponticola kessleri (2013)
17 RESULTS - Typical species Gudgeon Nase Bullhead Barbel Chub
18 RESULTS Fish numbers per site and year Dataset I Large differences in number of fish species and number of fish specimens in different sites and different years
19 RESULTS - Trend in species richness before and after arrival of invasive gobies Dataset I
20 RESULTS - Trend in number of stone loach before and after arrival of invasive gobies Dataset I
21 RESULTS - Trend in number of eel before and after arrival of invasive gobies Dataset I
22 RESULTS - Trend in number of chub before and after arrival of invasive gobies Dataset I
23 RESULTS - Trend in number of bullhead before and after arrival of invasive gobies Dataset I
24 Dataset II RESULTS - Trend in number of bullhead after arrival of invasive gobies
25 CONCLUSIONS Very fluctuating numbers of specimens over years, sites and species Ponto-Caspian gobies are increasing (especially round goby) Low numbers of specimens of most vulnerable benthic species e.g. bullhead We could not prove a significant impact of the Ponto-Caspian gobies on native fish species => explanation? Different sampling efforts? More attention to benthic species Different sampling conditions? Discharge, velocity, turbidity, Low number of specimens of benthic species Invasion time of Ponto-Caspian gobies in the Border Meuse too short What will the future bring? Continue monitoring efforts to follow population trends
26 Thank you! Questions?
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