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Com.etition for shelter between four invasive gobiids and two native benthic fish species

Current Zoology 2011年第6期57卷 844-851页

作者： N. VAN KESSEL m. dorenbosch m.R.m. DE BOER R.S.E.W. LEUVEN G. VAN DER VELDE Radboud University Nijm.gen Institute for Water and Wetland Research Department of Animal Ecology and Ecophysiology EO. Box 9010 6500 GL Nijmegen The Netherlands Radboud University Nijm.gen Institute for Water and Wetland Research Department of Environmental Science P.O. Box 9010 6500 GL Nijmegen The Netherlands Natuurbalans - Lim.s Divergens P.O. Box 31070 6503 CB Nijmegen The Netherlands Netherlands Institute of Ecology （NIOO - KNAW） EO. Box 50 6700 AB Wageningen The Netherlands Netherlands Centre for Biodiversity Naturalis EO. Box 9517 2300 RA Leiden The Netherlands

Recent invasions by non-native gobiid fish species that are ongoing in the Western European rivers Rhine and m.use, will lead to interactions with native benthic fish species. Since both non-native gobiids and native benthic species are bottom.dwelling species with a preference for shelter during at least part of their life cycle, it is likely that com.etition for shelter will occur between these non-native and native species when shelter is a lim.ting factor. To investigate the im.ortance of this m.cha- nism.for species replacem.nts, various habitat choice experim.nts were conducted between two com.on native benthic fish spe- cies （Cottus perifretum.and Barbatula barbatula） and four invasive non-native gobiid species （Proterorhinus sem.lunaris, Neogo- bius m.lanostom.s, N. kessleri and N. fluviatilis）. The first series of single specim.n experim.nts determ.ned the habitat choice of each individual fish species. In a second series of com.etition experim.nts, shifts in habitat choice in com.arison with the previ- ously observed habitat choice, were determ.ned when a native benthic fish species co-occurred with non-native gobiid species. Native C. perifretum.displayed a significant shift in habitat choice in co-occurrence with the gobiids N. kessleri or P. sem.lunaris. C. perifretum.was outcom.eted and m.ved from.the available shelter place to less preferred habitat types. During the com.etition experim.nts no change in habitat choice of B. barbatula was shown. Our study therefore suggests that com.etition for shelter is likely to occur in rivers invaded by N. kessleri and P. sem.lunaris at sites where shelter is lim.ting

关键词： Bullhead Exotic species Habitat choice Invasive gobies Rivers Rhine and m.use Stone loach

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