Article (Scientific journals)
Long-term trends in trait structure of riverine communities facing predation risk increase and trophic resource decline
Latli, Adrien; Descy, Jean-Pierre; Mondy, Cédric P et al.
2017In Ecological Applications, 27 (8), p. 2458-2474
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Keywords :
Riverines communities; Long-term trend; predation risk; trophic resource
Abstract :
[en] Many large European rivers have undergone multiple pressures which have strongly impaired ecosystem functioning at different spatial and temporal scales. Global warming and other environmental changes have favoured the success of invasive species, deeply modifying the structure of aquatic communities in large rivers. Some exogenous species could alter trophic interactions within assemblages by increasing the predation risk for potential prey species (top-down effect) and limiting the dynamics of others via resource availability limitation (bottom-up effect). Furthermore, large transboundary rivers are complex aquatic ecosystems which have often been poorly investigated so that data for assessing long-term ecological trends are missing. In this study, we propose an original approach for investigating long-term combined effects of global warming, trophic resource decrease, predation risk and water quality variations on the trait-based structure of macroinvertebrate and fish assemblages over 26 years (1985-2011) and 427-km stretch of the river Meuse (France and Belgium). The study of temporal variations in biological, physiological and ecological traits of macroinvertebrate and fish allowed identifying community trends and distinguishing impacts of environmental perturbations from those induced by biological alterations. We provide evidence, for this large European river, of an increase in water temperature (close to 1°C) and a decrease in phytoplankton biomass (- 85%), as well as independent effects of these changes on both invertebrate and fish communities. The reduction of trophic resources in the water column by invasive molluscs has dramatically affected the density of omnivorous fish in favour of invertebrate-feeders, while scrapers became the major feeding guild among invertebrates. Macroinvertebrate and fish communities have shifted from large-sized organisms with low fecundity to prolific, small-sized organisms, with early maturity, as a response to increased predation pressure.
Research center :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Environmental sciences & ecology
Author, co-author :
Latli, Adrien;  Université de Namur - UNamur
Descy, Jean-Pierre ;  Université de Namur - UNamur
Mondy, Cédric P
Floury, Mathieu;  Irstea
Viroux, Laurent;  Université de Namur - UNamur
Otjacques, William;  Université de Namur - UNamur
Marescaux, Jonathan;  Université de Namur - UNamur
Depiereux, Eric;  Université de Namur - UNamur
Ovidio, Michaël  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire de Démographie des poissons et hydroécologie
Usseglio-Polatea, Philippe;  Université de Loraine
Kestemont, Patrick;  Université de Namur - UNamur
Language :
English
Title :
Long-term trends in trait structure of riverine communities facing predation risk increase and trophic resource decline
Publication date :
November 2017
Journal title :
Ecological Applications
ISSN :
1051-0761
eISSN :
1939-5582
Publisher :
Ecological Society of America, Washington, United States - District of Columbia
Volume :
27
Issue :
8
Pages :
2458-2474
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 November 2017

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