Sylvie Tomanová

French National Agency for Water and Aquatic Environments

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Dominique Courret

Institut de Mécanique des Fluides de Toulouse

Olaf Mercier

Centre Chirurgical Marie Lannelongue

Stéphane Tetard

Laboratoire National Henri Becquerel

Pierre Sagnes

Institut de Mécanique des Fluides de Toulouse

Pablo A. Tedesco

Université Toulouse III - Paul Sabatier

Thierry Lagarrigue

École Nationale Supérieure Agronomique de Toulouse

Sylvain Richard

Institut de Mécanique des Fluides de Toulouse

Alain Alric

Office Français de la Biodiversité

Vincent Mataix

Électricité de France (France)

Nabor Moya

University of Saint Francis Xavier

Cooperative Institutions

Pôle de Recherche pour l'Organisation et la Diffusion de l'Information Géographique

Centre National de la Recherche Scientifique

French National Agency for Water and Aquatic Environments

Institut de Mécanique des Fluides de Toulouse

Université Toulouse III - Paul Sabatier

Office Français de la Biodiversité

Institut de Recherche pour le Développement

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

University of San Simón

Université de Toulouse

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Crayfish as geomorphic agents and ecosystem engineers: effect of a biomass gradient on baseflow and flood‐induced transport of gravel and sand in experimental streams

Freshwater Biology (2002)

Bernhard Statzner Odile Peltret Sylvie Tomanová

SUMMARY 1. Using experimental streams, we studied the impact of the crayfish Orconectes limosus on (i) the transport of gravel and sand at baseflow; (ii) the sediment surface (bedform, particle consolidation, proportion of sand, algal and gravel cover); and (iii) the critical shear stress ( τ C ) causing incipient gravel and sand motion during simulated floods. We examined (i) and (ii) in experimental outdoor flumes that replicated riffle‐pool sequences and (iii) in a larger laboratory flume, in which we exposed sediments retrieved from the outdoor flumes to a progressively increasing discharge. 2. Habitat changes induced by crayfish, such as bedform alterations in riffles (downstream displacement of riffle heads) and the increase of gravel on sand dunes in pools, had major impacts on the spatial and temporal patterns of the baseflow transport of gravel and sand. 3. In addition to their impact on bedform in riffles and on gravel cover in pools, crayfish prevented the physical consolidation of particles in riffles and reduced the algal cover and the proportion of sand in the surface layer in both riffles and pools. These crayfish impacts on sediment surface variables had complex, interacting effects on the mobilisation of gravel and sand during subsequent flood simulations. For sand, crayfish progressively decreased the τ C (i.e. the sum of bedform drag and skin friction) by about 50% along the entire biomass gradient in pools, whereas the presence of crayfish abruptly decreased the τ C by about 75% in riffles. For gravel, the discharge causing motion in riffles produced a shear stress (in terms of skin friction) on an even bedform that was about 75% lower in all flumes with crayfish compared with the flumes without crayfish. Crayfish had no impact on τ C for gravel in pools. 4. Scaling‐up these experimental results to real streams suggests that crayfish could affect the patch dynamics of major sediment transport events and habitat suitability for other organisms that, at larger spatial scales, could increase the overall spatio‐temporal habitat diversity and thus the overall structural and functional biodiversity of lotic communities.

Riffle

Bedform

Flume

Base flow

Perennial stream

10.1046/j.1365-2427.2003.00984.x

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Citations (139)

Étude de l’efficacité de la restauration de la continuité écologique utilisant la différenciation génétique au sein de populations de poissons

Simon Blanchet Jérôme G. Prunier Sylvie Tomanová Olaf Mercier

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Comparing fish assemblages and trophic ecology of permanent and intermittent reaches in a Mediterranean stream

Hydrobiologia (2010)

Esther Mas‐Martí Emili García‐Berthou Sergi Sabater Sylvie Tomanová Isabel Muñoz

Barbel

10.1007/s10750-010-0292-x

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Citations (65)

Funkční aspekt společenstva bezobratlých tekoucích vod tropického a mírného pásma

Sylvie Tomanová

Spolecenstva vodnich bezobratlých mohou být studovany jak z taxonomickeho tak i z funkcniho hlediska. Funkcni strukturu spolecenstva lze popsat pomoci vice biologických vlastnosti taxonů, ktere přimo odražeji adaptace organismů na vnějsi prostředi. Narozdil od mirneho pasma, jsou znalosti o řicni ekologii v neotropicke zoně spore a funkcni analýzy spolecenstev vodnich bezobratlých jsou vzacne. Hlavnim ukolem teto prace bylo tedy studovat a popsat vybrane biologicke vlastnosti neotropických taxonů. Tato informace byla nasledně použita k ověřeni některých ekologických konceptů v podminkach neotropických toků jako „River Habitat Templet“ a „River Continuum“ koncept. Navic bylo studovano, jestli pomoci funkcni analýzy spolecenstev bezobratlých je možne detekovat vliv cinnosti clověka na ekologický stav toku tak, jako tomu je nyni v tocich mirneho pasma. Bylo popsano osm biologických vlastnosti u 82 taxonů: potravni specializace, způsob přijmu potravy, způsob dýchani, maximalni velikost těla, flexibilita těla, tvar těla, adaptace na prouděni vody, pohyb a přichyceni k substratu. Výsledky meho výzkumu i) poukazaly na některe odlisnosti ve funkcni struktuře spolecenstev neotropickeho a mirneho pasma, ale ii) potvrdily obecnou platnost konceptu „River Habitat Templet“ a iii) konceptu řicniho kontinua - „River Continuum Concept“. Navic iv) bylo jasně prokazano možne využiti funkcni struktury spolecentva pro hodnoceni ekologickeho stavu neotropických toků. Publikovane kody biologických vlastnosti bezobratlých organismů mohou být použity v budoucich studiich o funkcni struktuře a variabilitě spolecenstev ci pro rozvoj metody hodnoceni ekologicke kvality vod neotropicke zony.

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Protecting fish from entering turbines: the efficiency of a low-sloping rack for downstream migration of Atlantic salmon smolts

La Houille Blanche (2017)

Sylvie Tomanová Dominique Courret Alain Alric

In April 2015, the efficiency of a system of low-sloping rack and bypass has been assessed for Atlantic salmon smolts at the small hydroelectric plant (HEP) of Auterrive on the Gave d'Oloron River (France ; turbine discharge: 7.8 m3.s-1 ; rack inclination: 26° relative to the horizontal ; bar spacing: 20 mm ; bypass discharge: 0.5 m3.s-1). 239 hatchery smolts (mean length 185 mm) were PIT-tagged and released 100 m upstream the HEP, in 5 groups at different times of the day. Their passages downstream the HEP by the bypass and as well by the fishpass for upstream migration were monitored with RFID antennae. On average 80.7% of smolts migrated through the HEP bypass and 3.8% of smolts descended through the fishpass. In total, 84.5% (min-max: 75.5-91.9%) of smolts migrated downstream the HEP via safe routes. 50% of them did it in less than 23 minutes since their release and 75% of them did it in less than 2 hours. Fish migration time was similar for afternoon, evening and night releases (median times between 19 and 21min), but was significantly longer when the fishes were released in the morning (median migration time: 3hours 17min). Our findings give credence to the recommended design criteria for low-sloping racks, which is the main solution implemented in France for small HEPs.

Hydroelectricity

10.1051/lhb/2017002

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Citations (8)

Trophic Levels and Functional Feeding Groups of Macroinvertebrates in Neotropical Streams

Hydrobiologia (2005)

Sylvie Tomanová Edgar Goïtia Jan Helešic

Detritivore

Taxonomic rank

River ecosystem

Detritus

10.1007/s10750-005-1255-5

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Citations (339)

Longitudinal and altitudinal changes of macroinvertebrate functional feeding groups in neotropical streams: a test of the River Continuum Concept

Fundamental and Applied Limnology / Archiv für Hydrobiologie (2007)

Sylvie Tomanová Pablo A. Tedesco Melina Campero Paul A. Van Damme Nabor Moya

The River Continuum Concept (RCC) explains the structural and functional characteristics of stream communities focusing on the gradually changing physical components from headwaters to downstream habitats of streams and rivers. The global value of the RCC is still uncertain, possibly because physical factors (e.g., altitude and then temperature, stream order, channel width) can vary differently in longitudinal river axes across the world. Moreover, RCC predictions in relation to different physical factors have not been tested adequately in different biomes, especially biomes outside of temperate North America. Here, we report on the functional structure of mac- roinvertebrate communities in neotropical streams from Bolivia along a broad altitudinal gradient (from 1120 to 4300 m a.s.l.), aiming to understand how altitude can affect the longitudinal changes in functional feeding groups (FFG) and richness predicted by the RCC. The RCC predictions for functional structure were not completely matched when analyzing FFGs in relation to an index of longitudinal stream gradient. However, after remov- ing the effect of altitude by using residuals from regressions between FFGs and altitude, FFG patterns matched RCC predictions more closely. We detected signifi cant relationships between altitude and the relative abundance of collector-gatherers, shredders and scrapers which may be related to changes in temperature, UV radiation and canopy cover along the altitudinal gradient. Our results indicate that altitude combined with position along the longitudinal gradient is an important factor governing the FFG structure of macroinvertebrate communities in neotropical streams.

10.1127/1863-9135/2007/0170-0233

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Citations (90)

Twenty-five years of hydromorphological restoration in the high-energy, gravel-bed rivers of southern France: What are the current benefits for bedload dynamics and sediment balance in the left-bank tributaries of the Aude River within the Minervois region?

Géomorphologie relief processus environnement (2024)

Gilles Arnaud-Fassetta Mathieu Brun Guillaume Brousse Luc Michler Yannick Chauvet

The article synthesizes 25 years of hydromorphological restoration in the high-energy, gravel-bed rivers of southern France. In the Minervois region, the authors highlight the challenges and advancements made in riverbed restoration following the catastrophic flood of November 1999. This event catalyzed research in fluvial geomorphology and led to significant restoration initiatives implemented by the SMMAR. The article pays particular attention to the role of floods and ordinary flow events in the hydromorphological functioning of the channels, specifically focusing on hydraulic geometry, channel pattern, bedload transport, and sediment balance. The methods developed rely on field observations and measurements, as well as image processing. Between 2012 and 2024, the transport distances of cobbles were monitored in the watersheds using RFID technology (passive and active microchips). From 2016 to 2021, sediment balances of the restored river sections were quantified through LiDAR surveys to better understand how rivers respond to the new flow conditions and channel morphology resulting from restoration efforts. The results indicate that the restored sections function as preferential sediment storage areas. Although the restoration has improved sediment transport conditions during floods, several tributaries do not contribute sufficiently to the sediment recharge of the main channels, leading to chronic sediment deficits. The data also emphasize the importance of ordinary flows in sediment transport, which can often result in riverbed incision. To achieve a more balanced sediment supply, the authors advocate for the reactivation of sediment sources at the watershed scale.

Sedimentary budget

Sedimentation

River morphology

Stream Restoration

10.4000/12m3m

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Citations (0)

Updated mortality estimation formulae for salmonids passing through Francis turbines at hydropower plants

Knowledge and Management of Aquatic Ecosystems (2023)

Sylvie Tomanová Dominique Courret Blaise Tymen Sylvain Richard Lionel Dumond

Downstream migrating fish can be strongly affected by hydroelectric facilities. To set up adapted mitigation measures, it is important to identify these impacts ( e.g. induced mortality rates). For Francis turbines, two mortality prediction formulas, developed in 1989 and updated in 2000, are currently used in France for salmonids according to turbine characteristics and fish size (Larinier and Dartiguelongue, 1989, updated by Bosc and Larinier, 2000). However, their use is limited when some parameters are unknown, such as turbine speed. Moreover, the updated version of can be criticized because of its unpublished development procedure and its unknown predictive power. The main purpose of this study is to update the existing formulae to meet the following objectives: (1) a transparent development procedure, (2) formulae simplification, (3) the use of simple (usually the best-known) turbine parameters, and (4) a maximization of the predictive power and an assessment of prediction errors. Based on data from 73 in situ mortality tests available in peer-reviewed and ‘grey’ literature, we developed two new formulae to estimate salmonid mortality rate in Francis turbines. The first one uses turbine peripheral speed, diameter and fish size (correlation between predicted and observed mortality rates r = 0.89, and root mean square error RMSE = 0.11). The second one is based on usually known parameters: turbine discharge, water head and fish size, to allow a broader applicability ( r = 0.89, RMSE = 0.10). This study comforts the validity of previous formulae and provides two new ones allowing a satisfactory precision in the estimations.

Hydroelectricity

Francis turbine

10.1051/kmae/2023001

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Citations (1)

Tamaño corporal, tolerancia ecológica y potencial de bioindicación de la calidad del agua de Anacroneuria spp. (Plecoptera: Perlidae) en América del Sur

Revista de Biología Tropical (2005)

Sylvie Tomanová Pablo A. Tedesco

Knowledge about the biology and ecology of neotropical aquatic taxa is crucial to establish general ecological rules and water protection systems. Based mainly on published data, the present work shows the following biological and ecological characteristics of Anacroneuria species (Klapálek 1909): a) the wide range of environmental conditions of rivers where Anacroneuria species occur, b) species number decreases along an increasing elevation gradient, c) body size increases in relation to the maximum altitude of occurrence, d) altitudinal range increases with body size, e) there is a constant relationship between male and female body size, and finally, f) larger females lay larger eggs. In temperate countries, the family Perlidae in general, and the genus Anacroneuria in particular, are viewed as excellent water quality indicators. We suggest that, considering the complexity of the group's ecology in South America, it should not be automatically considered an excellent bioindicator in the Neotropical region.

Bioindicator

Aquatic insect

10.15517/rbt.v55i1.6058

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Citations (18)