Synthèse des dix premières années de suivi hydrobiologique du Rhône au niveau de la centrale nucléaire
de Saint-Alban (France)

Fruget, Jean‐François; Centofanti, Michel; Dessaix, J.; Olivier, Jean‐Michel; Druart, Jean‐Claude; Martinez, Pierre-Jean

doi:10.1051/hydro:1999002

Cited by 11 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Chlorophyll a concentrations mainly reflect the abundance patterns of diatoms and chlorophyll b those of chlorophytes (Hellings et al 1999;Lemaire et al 2002;Lionard et al 2008). In Western European rivers, diatoms usually dominate the phytoplankton community (Lemaire et al 2002;Lionard et al 2008), as also previously observed in the Rhone River (Fruget et al 1999). In the present study, two peaks in Chl a were observed in the Rhone in 2005, the first in March corresponding to the spring bloom, and the second in June and early summer.…”

Section: Phytoplankton Importance and Compositionmentioning

confidence: 81%

“…Spring blooms of diatoms are observed regularly in other rivers or upper estuaries (Garnier et al 1995;Lemaire et al 2002;Lionard et al 2008), although this group dominates all year round. Chlorophyll b concentrations indicate the presence of chlorophytes, which were observed in abundance in upstream portions of the Rhone River by Fruget et al (1999). Chlorophytes frequently constitute the second-most important component of riverine phytoplankton after diatoms (Fruget et al 1999;Lemaire et al 2002).…”

Section: Phytoplankton Importance and Compositionmentioning

confidence: 97%

See 1 more Smart Citation

Seasonal variation in stable C and N isotope ratios of the Rhone River inputs to the Mediterranean Sea (2004–2005)

Harmelin-Vivien¹,

Dierking²,

Bănaru³

et al. 2010

Biogeochemistry

View full text Add to dashboard Cite

The temporal variation in the stable carbon and nitrogen isotope ratios of particulate organic matter (POM) in the Rhone River was investigated on a monthly basis during a 2-year period (2004)(2005). In spite of high month-to-month variation, interannually consistent seasonal trends appeared, with significantly lower d 13 C (\-28.2%) in spring than in the other seasons. In contrast, d 15 N did not exhibit significant temporal variation. In spring and summer, high chlorophyll a and b concentrations were associated with low C/N values (\8) and a high percentage of organic carbon (%C) and organic nitrogen (%N), testifying to high development of autochthonous riverine phytoplankton (mainly diatoms and chlorophytes). In fall and winter, higher d 13 C ([-27.2%) and C/N ([8) values, and lower %C, %N, and chlorophylls concentrations indicated the predominance of allochthonous terrestrial detritus material in the river POM. The lower d 13 C values recorded in spring-summer, when the phytoplankton biomass was high, were related to the lower carbon isotopic signatures of freshwater diatoms and chlorophytes compared to those of terrestrial plants. Overall, Rhone River POM was mainly composed of terrestrially derived material (90%), with autochthonous phytoplankton representing only 10% as a mean, in spite of a higher mean contribution of phytoplankton (27%) to river POM in summer.

show abstract

Section: Phytoplankton Importance and Compositionmentioning

confidence: 81%

Section: Phytoplankton Importance and Compositionmentioning

confidence: 97%

Seasonal variation in stable C and N isotope ratios of the Rhone River inputs to the Mediterranean Sea (2004–2005)

Harmelin-Vivien¹,

Dierking²,

Bănaru³

et al. 2010

Biogeochemistry

View full text Add to dashboard Cite

show abstract

“…The present fish as semblage is a relict assemblage dominated by species with broad breeding requirements (such as roach, chub, bleak, pumpkinseed and white bream which ac counted for 88 % of the individuals) that find condi tions sufficient for them to complete their life cycle. The size class distributions of the most abundant spe cies show that recruitment occurred normally for these species during the study period (Fruget et al 1999). Most fish species forming the communities in large ri vers are long-lived species whose life-history traits (fe cundity, egg size, etc.)…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, the periphyton seemed more typi cal of each sampling station. Most of the taxa were ty pical of eutrophic waters in the wider sense (meso-eutrophic to eutrophic), and consisted of ubiquitous op portunistic species (Fruget et al 1999) as is often the case in nutrient-rich lowland rivers (Descy 1992, Del Giorgio et al 1991.…”

Section: Discussionmentioning

confidence: 99%

Temporal and spatial dynamics in large rivers : example of a long-term monitoring of the middle Rhone River

Fruget

Centofanti

Dessaix

et al. 2001

Ann. Limnol. - Int. J. Lim.

View full text Add to dashboard Cite

In running water, the main natural factor of disturbance is hydraulic. Investigation of its biological impact is currently complicated by the increase of anthropogenic disturbances which tend to mask the natural functioning of rivers. Monitoring of the impacts of the artificial alterations undergone by the Middle Rhône River for some decades took place in the mid-1980s. Discharge and temperature could constitute the major events controlling the biological dynamics in terms of variations in species richness, diversity, and abundance. The between-years changes of the structure and diversity of macroinvertebrate communities were connected with the amplitude of discharge fluctuations. This was in accordance with the disturbance-diversity concept and it seems to confirm the intermediate disturbance hypothesis. The fish community mainly depended on hydroclimatic factors that influenced breeding success. Variations in nutrient input played a secondary role in controlling changes in some communities (particularly the periphyton). Therefore it appears that the study of long-term changes in river systems, including the dynamics of their biological communities, requires continuous observations and data collection that only medium-to longterm studies can provide, implying the setting up of ecological monitoring centres for the natural environment such as the Long Term Ecological Research (LTER) sites in United States. En eau courante, le principal facteur naturel de perturbation est d'ordre hydraulique. A l'heure actuelle, ce problème se trouve particulièrement compliqué par l'accroissement des perturbations anthropiques qui tendent à masquer le fonctionnement naturel des cours d'eau. Un suivi des impacts des perturbations anthropiques subies depuis plusieurs décennies par le Rhône Moyen a été mis en place au milieu des années 80. L'hydrologie et la température semblent les principaux événements régissant la dynamique biologique en terme de variation de la richesse spécifique, de la diversité et de l'abondance des différentes espèces. Les variations inter-annuelles de la structure et de la diversité des peuplements de macoinvertébrés sont ainsi liées à l'amplitude des fluctuations de débit. Ceci est tout à fait en accord avec le concept de perturbation-diversité et la théorie des perturbations moyennes. Pour sa part, le peuplement piscicole dépend des facteurs hydroclimatiques pour le succès de la reproduction. En second lieu, la dynamique des. apports nutritifs gouverne également l'évolution de certains peuplements (en particulier le periphyton). Dans ce cadre, l'étude de l'évolution des hydrosystèmes fluviaux et de la dynamique de leurs peuplements impliquent une continuité d'observation et de récolte de données que seule permet une surveillance à moyen ou long terme, nécessitant la mise en place de véritables observatoires écologiques du milieu naturel, tels que les sites du programme LTER (Long Term Ecological Research) aux Etats-Unis.

show abstract

“…Les aménagements hydroélectriques de Pierre-Bénite et de Péage-deRoussillon (figure 1), en aval de Lyon, sont suivis depuis plus de dix ans dans le cadre de diverses études (FRUGET, 1991 ;FRUGET et al, 1999 ;ARALEPBP, 2000). Quatre stations physiquement dissemblables, deux d'entre elles étant situées en secteurs de radiers et deux autres en secteurs lentiques endigués ( figure 1A), régulièrement échantillonnées, sont considérées dans le cadre de cette étude.…”

Section: -Site D'étude -Matériel Et Méthodesunclassified

Biodiversité structurelle et fonctionnelle des peuplements de macro-invertébrés en tant que descripteur de la variabilité hydraulique : exemple de deux parties court-circuitées du Rhône moyen

Fruget¹,

Dessaix²

2005

rseau

View full text Add to dashboard Cite

Le peuplement faunistique d'un hydrosystème est constamment soumis à la variabilité spatio-temporelle de l'environnement. Il en résulte que les espèces dominantes sont celles présentant les caractéristiques biologiques et les préférendums écologiques les plus appropriés aux différents types d'habitats de la mosaïque fluviale. Une approche multiparamétrique de description de l'état physique du milieu à partir de la prise en compte simultanée d'indicateurs de structure et de fonction des communautés d'invertébrés a été testée sur le Rhône Moyen. L'étude de quatre stations physiquement dissemblables situées dans deux secteurs court-circuités montre ainsi qu'à la structuration selon la vitesse du courant (unités fonctionnelles) correspond des différences trophiques et écologiques, tandis qu'à la structuration physique du milieu (secteur de cours d'eau) correspond des différences taxonomiques. La disponibilité en habitats pour les invertébrés est alors corrélée à la configuration du chenal du tronçon considéré. Les assemblages d'espèces répondent ainsi, au travers de leur occurrence et de leur abondance, à un gradient physique. Cette approche, prédictive et appliquée, mettant en parallèle constat biologique et structure physique des stations et des milieux, permet d'établir une typologie fonctionnelle des écosystèmes aquatiques considérés et de proposer une gestion intégrée adaptée aux problèmes posés (gestion des habitats et de leur biodiversité, restauration hydraulique et écologique des milieux, etc.).The aquatic communities of a hydrosystem are constantly subject to the space-time variability of the environment. As a result, the dominant species are those presenting the biological characteristics and the ecological preferences best adapted with the various types of habitats of the river mosaic. A multiparametric description of physical structure from macroinvertebrate communities, taking into account both indicators of structure and functioning of these communities, was tested on the Middle Rhône River (France). The study of four physically dissimilar stations located in two by-passed sections showed that the arrangement due to the current velocity (functional units) corresponded to trophic and ecological differences, whereas the arrangement due to physical conditions (reach of river) corresponded to taxonomic differences. The availability in habitats for the invertebrates was correlated with the configuration of the channel of the section considered. The patches of species answered thus, through their occurrence and their abundance, to a physical gradient. This approach, predictive and applied, with parallel between the biological report and the physical structure of the stations and the environments, makes it possible to establish a functional typology of the aquatic ecosystems considered and to propose an integrated management adapted to the problems arising (management of the habitats and of their biodiversity, hydraulic and ecological restoration of the environments, etc)

show abstract

Synthèse des dix premières années de suivi hydrobiologique du Rhône au niveau de la centrale nucléaire de Saint-Alban (France)

Cited by 11 publications

References 3 publications

Seasonal variation in stable C and N isotope ratios of the Rhone River inputs to the Mediterranean Sea (2004–2005)

Seasonal variation in stable C and N isotope ratios of the Rhone River inputs to the Mediterranean Sea (2004–2005)

Temporal and spatial dynamics in large rivers : example of a long-term monitoring of the middle Rhone River

Biodiversité structurelle et fonctionnelle des peuplements de macro-invertébrés en tant que descripteur de la variabilité hydraulique : exemple de deux parties court-circuitées du Rhône moyen

Contact Info

Product

Resources

About