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Aude BEAUGER

Ingénieur d’étude
Equipe "Hydrosystèmes fluviaux et bassins versants"

Contact : aude.beauger@uca.fr

Tél : +33 (0)4 73 34 68 38
Fax : +33 (0)4 73 34 68 24


Thèmes de recherche

- Evaluation de la qualité des milieux par la prise en compte conjointe de critères hydromorphologiques, physico-chimiques et hydrobiologiques.
- Base de données hydrobiologiques.
- Etude des diatomées et des macroinvertébrés benthiques.
- Caractérisation hydroécologique des annexes hydrauliques.
- Reconstitutions paléoenvironnementales et interactions homme-milieux : approche paléoécologique (diatomées fossiles).

Terrains de recherche

- Fleuve Loire
- Rivière Allier


Programmes de Recherche en cours

- Programme Pluri-Formations "Rivière Allier" (dir. J-L. Peiry)
- Programme Eaux & Territoires "GALE&T" (dir. J. Steiger)


Publications

ACL - Articles dans des revues à comité de lecture

2015


  • Beauger Aude, Delcoigne Arnaud, Voldoire Olivier, Serieyssol Karen K. et Peiry Jean-Luc« Distribution of diatom, macrophyte and benthic macroinvertebrate communities related to spatial and environmental characteristics: the example of a cut-off meander of the River Allier (France) », Cryptogamie, Algologie, 36 (3), p. 1-33. DOI : 10.7872/crya/v36.iss3.2015.1. https://hal.archives-ouvertes.fr/hal-01170337.
    Résumé : Currently, a consensus has been reached to protect and restore cut-off meanders. Therefore, it is important to understand how these wetlands function. To our knowledge, the spatial and temporal distribution of both benthic diatoms and macroinvertebrates, associated with macrophytes communities, linked to the geomorphology, has not been studied extensively. In the upstream and intermediate zones, the low water temperature and the high conductivity revealed a connection with the groundwater. Moreover, the geomorphological riffle characterizing the intermediate zone created the same downwelling and upwelling processes as in running water, with a groundwater/hyporheic/surface water ecotone and produced physico-chemical differences between the upstream and the downstream zones and thereby modify the diatom, macroinvertebrate and macrophyte distribution. Downstream, water input from the main channel of the Allier River allowed the development of taxa observed in the River. All these hydrological connections and the sedimentation modified the physical, chemical and geomorphological characteristics, thereby, creating a gradient of water quality, influencing the distribution of the biotic communities.
    Mots-clés : /, cut-off, diatoms, geomorphology, Macroinvertebrates, macrophytes, meander, water.


  • Miras Yannick, Beauger Aude, Lavrieux Marlène, Berthon Vincent, Andrieu-Ponel Valérie et Ledger Paul« Tracking long-term human impacts on landscape, vegetal biodiversity and water quality in the Lake Aydat catchment (Auvergne, France) using pollen, non-pollen palynomorphs and diatom assemblages », Palaeogeography, Palaeoclimatology, Palaeoecology, 424, p. 76-90. DOI : 10.1016/j.palaeo.2015.02.016. https://hal.archives-ouvertes.fr/hal-01120579.
    Résumé : Palaeoenvironmental studies allow the assessment of long-term human–climate–environmental interactions, and furnish valuable tools for the sustainable management of lacustrine ecosystems. A good example is the multi-proxy study of Lake Aydat's 19 m sedimentary core. Previous research revealed the role of climate and human activities on lake sedimentation, and identified two sedimentary units (6700 ± 200 to 3180 ± 90 and 1770 ± 60 cal. yr BP to present) separated by an erosive mass-wasting deposit (Lavrieux et al., 2013a). Pollen, non-pollen palynomorphs (e.g. fungal and algal spores, rotifer resting eggs), and diatom-based trophic reconstructions have been used to track the impacts of past land use on landscape evolution, vegetal biodiversity and water quality. Palaeoenvironmental data were also compared with local archaeo-historical datasets which allowed refined landscape reconstructions, especially for late Antiquity. The results obtained demonstrate that even Neolithic and Bronze Age human activities (between ca. 4600 and 4300 cal. yr BP and between ca. 3900 and 3500 cal. yr BP) had a discernible influence on catchment vegetation and lacustrine trophic dynamics of Lake Aydat, underlining the vulnerability of the ecosystem. Recurrent and complex models of past vegetation changes, phases of water nutrient over-enrichment and lake resilience were identified and related to grazing activities, but also to land use practises, which have been overlooked in Auvergne, such as mountain agriculture and hemp retting.
    Mots-clés : Anabaena, Diatom-inferred trophic level, EUTROPHICATION, Human impact, Lake water quality, Pollen, Rotifer resting eggs.
2014

  • Beauger Aude et Lair Nicole« Analyse des principales méthodes de bio-évaluation basées sur les macroinvertébrés benthiques. », Bulletin de la société linnéenne de Lyon, Bulletin hors série n° 4, p. 15-34. https://hal.archives-ouvertes.fr/hal-01081925.

  • Beauger Aude, Peiry Jean-Luc, Lair Nicole et Voldoire Olivier« Ecological characterization of natural and impacted meander cut-offs of the River Allier using benthic macroinvertebrates », Ephemera, 14 (2), p. 83-106. https://hal.archives-ouvertes.fr/hal-01077881.
    Résumé : Today, the hydrological function and biodiversity of riverine secondary channels are generally recognized and managers tend to protect and restore them. In this study we focused on different parapotamal meander cut-offs. Six sites were examined, two of them being impacted by gravel extraction or deepened for halieutic activity. In order to test whether systematic differences in communities occurred upstream and downstream of the different sites, temperature and dissolved oxygen concentration were continuously monitored, other physical and chemical data were monthly measured and benthic macroinvertebrates were sampled in two seasons. Related to the abiotic data, in each site, water exchanges occurred between the river and / or the groundwater. In the unmodified sites, those few silted up displayed the greatest biodiversity with numerous EPT (Ephemeroptera, Plecoptera and Trichoptera) while in those largely silted, the habitat homogeneity induced a low biodiversity. In the two impacted sites, the upstream modification enhanced natural silting and few EPT were present while in the site largely open to the river, water quality, diversity and EPT richness remained high.
    Mots-clés : between-class Correspondence Analysis (bCA), habitats, physical and chemical monitoring.


  • Beauger Aude, Serieyssol Karen et Peiry Jean-Luc« Diatom distribution in natural and impacted cut-off meanders of the Allier River, France », Diatom Research, 29 (2), p. 119-145. DOI : 10.1080/0269249X.2013.863224. https://hal.archives-ouvertes.fr/hal-01077852.
    Résumé : basalt and downstream – sedimentary), differ in their degrees of infill or depth. In each region, three cut-off meanders were examined; one in each region was impacted by gravel extraction (upstream deepening) and halieutic improvement (downstream deepening), whereas the others were left in their natural state having different silt accumulations either almost cut-off from the river or less silted-up and more open to the river. The sites were monitored for one year for physical and chemical characteristics. Diatom samples collected in summer 2009 were examined along with their associated biocenosis. The two catchments, differing in geology, land-use and water quality, sheltered different diatom communities. Physical and chemical differences were recorded between up- and downstream zones of each cut-off meander due to both the influence of the groundwater (buffering the water temperature among others) and the periodic inflow from the main channel (increased oxygen saturation concentration in downstream end of the cut-off meanders, except for the impacted upstream zone which contained a lot of macrophytes). In the upstream reach (except for one site), the connection with the groundwater from the surrounding catchment, which acts as a hydro-geological reservoir, might explain the highest mineralization and water hardness recorded mainly in the upstream zone of the cut-off meander, and the presence of Pseudostaurosira subsalina (Hustedt) Morales and Thalassiosira weissflogii (Grunow) Fryxell & Hasle. For the downstream reach, in addition to up- and downstream differences, other factors came into play giving rise to different communities, for example, cattle trampling in the cut-off meander leading to the presence of hypereutrophic and polysaprobic taxa or the potential local re-emergence of mineral springs associated with brackish taxa. Moreover, the up- or downstream deepening also induced differences: the extraction of sediment nearer to the river created a system in which water input from the main channel flows in through a larger opening, inducing allochthonous processes. This increased the river’s influence, creating a renewal of earlier morphological and ecological conditions, whereas the gravel extraction that modified the upstream zone increased the influence of groundwater from the surrounding catchment on this area of the site and led to water conditions independent of the main channel. Furthermore, this study has provided an important picture of the environmental variables, mechanisms and processes that drive the distribution of diatoms within the cut-off meanders along the Allier River, which can can be applied in future paleo-environmental studies.
    Mots-clés : cut-off meanders, ecology, multivariate analyses, taxa distribution, water chemistry.


  • Ejarque Ana, Beauger Aude, Miras Y., Peiry J.-L., Voldoire O., Vautier F., Benbakkar M. et Steiger J.« Historical fluvial palaeodynamics and multi-proxy palaeoenvironmental analyses of a palaeochannel, Allier River, France », Geodinamica Acta, 27 (1), p. 1-23. DOI : 10.1080/09853111.2013.877232. http://dx.doi.org/10.1080/09853111.2013.877232.
    Résumé : A palaeoenvironmental study of a palaeochannel within the lower alluvial floodplain of the Allier River, France, has been carried out at a high temporal resolution. Research was based upon a multi-proxy approach using different sedimentological (magnetic susceptibility, sediment texture and loss on ignition) and palaeoecological (pollen, non-pollen palynomorphs (NPPs), diatoms – indicators). The palaeochannel was dated from six radiocarbon dates and spans from the second to the eleventh century AD. The cultural landscape history of this floodplain and the progressive hydrological disconnection of the palaeochannel between the Antiquity and the early Middle Ages could be reconstructed according to several characteristic environmental phases. Co-inertia analysis linking pollen, NPPs and diatom corroborated the significant co-structure of these proxies and allowed to distinguish functional palaeoecological groups in terms of landscape openness, on-site aquatic and hygrophilous vegetation, riparian woodland, soil moisture and grazing pressure. Results obtained underpin the importance of grazing as a major agent of landscape change in floodplains, especially since the ninth century AD, when the clearance of the riparian woodland is attested. Gallo-Roman and Late-Antiquity land-use systems, on the contrary, allowed for the preservation of riparian fluvial landscapes.

C-ACT - Communications avec publication dans des actes

2015

  • Beauger Aude, Peiry Jean-Luc, Garreau Alexandre et Voldoire Olivier« Benthic diatom and macroinvertebrate communities from the impacted bypass channel of Poutès, upper Allier River (France): preliminary results before the dam removal. », in I.S. Rivers 2015, Lyon, France. https://hal.archives-ouvertes.fr/hal-01170126.
    Résumé : For the first time in France a dam is being removed in order to restore ecological and sediment continuity and to allow salmon migration. This modification of the dam of Poutès configuration allows the establishment of a long-term study. The first step is the evaluation of the geomorphological, sedimentary and ecological characteristics before the works in a reach of 21km including the bypassed section. This analysis is based on the study of diatoms and benthic macroinvertebrates collected upstream of the dam, in the bypassed section, and downstream of the penstock pipe release. The results show the impact of the dam on communities arising from a change in the water quality, but also habitats including the presence of very long and deep pools in the bypassed section, which alternate with rapids, which change the river dynamics of watercourse.
    Mots-clés : Benthic macroinvertebrates, bypass channel, Dam impacts, diatoms, longitudinal reach.
2014

  • Chassiot Léo, Chapron Emmanuel, Beauger Aude, Miras Yannick, Albéric Patrick, Ledoux G., Lajeunesse P., Schwab M.J., Develle Anne-Lise, Arnaud Fabien, Lehours Anne-Catherine, Di-Giovanni Christian et Jezequel D.« Impact of Environmental changes of lacustrine dynamics in the Lake Pavin over the 7,000 years (French Massif Central) » (présenté à 5th International MAAR Conference), in Communication orale, november 17-22 2014, Queretaro, Mexico. https://hal.archives-ouvertes.fr/hal-01112194.

  • Chassiot Léo, Chapron Emmanuel, Beauger Aude, Miras Yannick, Albéric Patrick, Ledoux Grégoire, Lajeunesse Patrick, Schwab M., Develle Anne-Lise, Arnaud Fabien, Lehours Anne-Catherine et Jézéquel Didier« Lake Pavin paleolimnology and sedimentary records of regional Natural Hazards over the last 7000 years (French Massif Central) » (présenté à International Congress of Sedimentology), in Communication orale, august 18-22 2014, Genève , Switzerland. https://hal.archives-ouvertes.fr/hal-01109426.

  • Defive Emmanuelle, Poiraud Alexandre, Berger Jean-François, Virmoux Clément, SANIAL Bernard, Garcia Daniel, Voldoire Olivier, CHARRIER Gaspard, RENAULT Amélie, Guilbert Jacques, Bouvard Emma, Raynal Jean-Paul, Dendievel André-Marie, Voruz Jean-Louis, Miras Yannick, Cabanis Manon, Beauger Aude, Gunnell Yanni, Braucher Régis, Barra Adrien, GREGOIRE Fabrice, Blanc Elodie, DUMOULIN François, Guadelli Jean-Luc, Lafarge Audrey et Delvigne Vincent« Réponse des têtes de bassin aux fluctuations environnementales, du Tardiglaciaire à l’Actuel : l’exemple du bassin supérieur de la Loire dans le massif du Mézenc (Velay-Vivarais, Sud-Est du Massif central, France) » (présenté à Colloque AFEQ-CNF INQUA Q9 " Le Quaternaire : marqueurs, traçeurs et chronomètres "), in Communication orale, 26-28 mars 2014, Lyon, France : AFEQ-CNF INQUA. https://hal.archives-ouvertes.fr/hal-01131230.
    Résumé : Dans le Massif central, les têtes de bassin (ordre Strahler 3-4 et inférieur) sont un domaine encore peu investi pour l’étude des flux hydro-sédimentaires liés aux fluctuations environnementales quaternaires. Le système hydrographique naissant recèle pourtant d’intéressantes archives sédimentaires, à l’échelle au moins des temps postérieurs au dernier glaciaire. Motivé par les observations préliminaires effectuées ces dernières années dans le massif du Mézenc (Velay oriental, bassin supérieur de la Loire), le programme WRACC, financé par l’Etablissement Public Loire et le FEDER, se propose d’aborder l’étude de ces dépôts et de leur environnement sous l’angle d’une approche géoarchéologique pluridisciplinaire. La prospection est en cours, et s’appuie sur des coupes naturelles ainsi que sur l’ouverture de tranchées en travers d’un fond de vallon (Champetienne) où se sont concentrées nos investigations. Les données analytiques ne sont pas encore disponibles. Il est cependant possible, grâce aux observations stratigraphiques et aux premières datations obtenues, de poser quelques jalons. A l’échelle de l’Holocène au moins, les cours d’eau semblent avoir fluctué dans leur fond de vallon sans progrès de l’encaissement, alternant phases de stockage et de déstockage. La forme des chenaux successifs et le gabarit des matériaux les remblayant témoignent des fluctuations corrélatives du style fluvial et de la compétence. Les séquences débutent généralement par une nappe alluviale très grossière d’âge indéterminé témoignant d’un système de forte énergie. Le 4e-5e siècle après J.-C. semble marquer le terme d’une phase de stabilité avec remaniement des horizons pédologiques et de la végétation. Après cette vigoureuse phase de détritisme, la période stable allant des 8e-9e siècles au 15e siècle est enfin suivie par une crise érosive de faible énergie à l’Epoque Moderne, où la part respective des forçages naturels (PAG) et anthropiques peut être plus particulièrement discutée.
    Mots-clés : Eastern Velay, French Massif Central, Géoarchéologie, Geoarcheology, Holocene.

  • Miras Yannick, Beauger Aude, Lavrieux Marlène, K. Serieyssol Karen, Andrieu-Ponel Valérie et Latour Delphine« Tracking long-term human impacts on landscape, vegetal biodiversity and water quality in the Lake Aydat catchment (Auvergne, France) using pollen, NPP and diatom assemblages. » (présenté à QuickLakeH2014, an international workshop on Lakes and Human interactions), in Communication orale, september 15-19 2014, Ankara, Turkey. https://hal.archives-ouvertes.fr/hal-01112215.
2013

  • Riera Mora Santiago, Miras Yannick, Servera Gabriel, Julia Ramon, Beauger Aude, Ejarque Ana, Palet Martinez Josep Maria, H. Orengo Hector, Euba Itxaso et Garcia Arnau« Human management and microregional landscape variability of high altitude Eastern Pyrenees during historical times: the upper valleys of Ter and Tet. » (présenté à Pollen biotechnology, diversity and function in a changing environment), in Communication orale, 17-20 september 2013, Madrid, Spain : 2nd International APLE-APLF Congress. https://hal.archives-ouvertes.fr/hal-01112234.
2012
2011

  • Ejarque Ana, Miras Yannick, Steiger Johannes, Beauger Aude, Voldoire Olivier, Peiry Jean-Luc, Vautier Franck et K. Serieyssol Karen« 2000 ans de paléodynamique fluviale et d’histoire du paysage dans la plaine alluviale de l’Allier révélés par l’analyse multi-proxy de 2 paléochenaux (Auvergne, France) » (présenté à Palynologie et diversités: marqueurs, milieux, méthodes, modèles, applications), in Poster, september 19-22, Meudon, France : poster. https://hal.archives-ouvertes.fr/hal-01112312.

C-COM - Communications orales dans une conférence nationale ou internationale

2012
2011
2010

C-AFF - Affiches / posters dans une conférence nationale ou internationale

2014

  • Peiry J.-L., Beauger Aude, Celle-Jeanton H., Voldoire O. et Casado Casado, A.« SOHAL : système d'observation d'une annexe hydraulique de l'Allier » (poster), présenté à Conseil Régional Auvergne. https://hal.archives-ouvertes.fr/hal-01115949.
    Résumé : Ce poster à été présenté dans le cadre du colloque de restitution du CPER Auvergne, le 8 décembre 2014 à l'Hôtel de Région, Clermont-Ferrand. Ce poster synthétise les actions de recherche mise en oeuvre dans le cadre d'un système d'observation de bras morts de l'Allier.
    Mots-clés : Allier, bras mort, écohydrologie, hydroécologie, système d'observation.

CH - Chapitres d'ouvrage

2015

  • Steiger Johannes, Corenblit Dov Jean-François, Arrignon Florent, Beauger Aude, Dejaifve P-A, Delmotte Sebastien, Hortobágyi Borbála, Lambs Luc, Planty-Tabacchi Anne-Marie, Sans F., Simon P., Tabacchi Eric, Valette Philippe, Vautier Franck, Voldoire Olivier et Yeny E.« Contribution de l'analyse multi-temporelle pour la gestion et restauration des cours d'eau : végétation riveraine et résilience (projet GALE&T) », in Concilier la gestion de l'eau et des territoires, éd. par L. Goeldner-Gianella, O. Barreteau, A. Euzen, M. Pinon-Leconte, Q. Gautier, et P. Arnould, Editions Johanet, p. 41-55. https://hal.archives-ouvertes.fr/hal-01576295.
    Mots-clés : cours d'eau, gestion, végétation riveraine.