WorldCat Identities

Guérold, François

Overview
Works: 29 works in 35 publications in 2 languages and 80 library holdings
Roles: Author, Thesis advisor, Other, Opponent
Classifications: QH541.5.W3, 553.7
Publication Timeline
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Most widely held works by François Guérold
L'eau à découvert by Luc Abbadie( )

2 editions published in 2017 in French and held by 27 WorldCat member libraries worldwide

Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau? Son rapport avec l'apparition de la vie? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine? Quel est son cycle? Quelles sont ses propriétés chimiques? Comment les sociétés se sont-elles emparées de cet élément précieux? Allons-nous manquer d'eau? L'eau est-elle source de conflits? Comment l'eau est-elle gérée? Comment recycle-t-on une eau polluée? Quels sont les risques pour la santé mondiale? Quels sont les grands enjeux liés à l'eau au xxie siècle? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage
A la découverte des orchidées de Lorraine by François Guerold( Book )

2 editions published in 1998 in French and held by 16 WorldCat member libraries worldwide

L'acidification des cours d'eau : impact sur les peuplements de macroinvertébrés benthiques : application au massif Vosgien by François Guérold( Book )

3 editions published in 1992 in French and held by 3 WorldCat member libraries worldwide

L'acidification des eaux de surface, conséquences des émissions anthropiques de SO2 et NOX a été appréhendée dans le massif Vosgien. Deux approches ont été adoptées. Une étude spatiale du phénomène, comprenant un descriptif des facteurs physico-chimiques et des peuplements de 34 cours d'eau, et un suivi de l'évolution temporelle des paramètres chimiques et des peuplements. Il a ainsi été mis en évidence que de nombreux ruisseaux présentent des chimismes atypiques soit temporairement soit en permanence. Les ruisseaux acides sont caractérisés par des concentrations élevées en protons et en aluminium une alcalinite résiduelle ou nulle et des eaux très faiblement mineralisées. Dans de tels cours d'eau, les peuplements de macroinvertébrés benthiques sont profondement modifiés. Tous les groupes faunistiques majeurs sont affectés. Mollusques, crustacés et éphéméroptères disparaissent totalement en milieu acidifié. Diptères, coléoptères et trichoptères affichent une réduction significative des richesses et abondances, tandis que les plécoptères, bien que moins diversifiés peuvent être dominants avec les oligochètes. Au total de 50 à 70% des taxa ne sont plus retrouvés dans les ruisseaux acidifiés. Une approche écophysiologique a montré que les mécanismes de régulation ionique sont perturbés chez certaines espèces sensibles
Effets de l'acidification des ruisseaux vosgiens sur la biologie, l'écologie et l'écophysiologie de Gammarus fossarum Koch, 1835 (Crustacea Amphipoda) : Approche intégrée à différents niveaux d'organisation. by Vincent Felten( Book )

2 editions published in 2003 in French and held by 3 WorldCat member libraries worldwide

Due to its natural characteristics, the Vosges massif is particularly sensitive to the acidic atmospheric depositions, which generates an acidification of forested headwater streams. The present study mainly focuses on the study of an acid-sensitive species Gammarus fossarum by following an approach at different levels of biological organisation. In this context we have first identified the physicochemical parameters influencing the distribution and the density of this species in headwater streams. Secondly, we evaluated the effect of episodic-acid-stresses on benthic communities in general and on G. fossarum in particular. A third step consisted in studying the effects of the acidification on the ecophysiology and the survival of the amphipod in order to purpose a biomarker (Hemolymph [Na+] and [Cl-]). We also defined several ecological and biological traits of G. fossarum. Finally, we tried to assess the consequence of acidic stress on these traits
Metal release from contaminated leaf litter and leachate toxicity for the freshwater crustacean Gammarus fossarum by Florence Maunoury-Danger( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Plecoptera response to acidification in several headwater streams in the Vosges Mountains (northeastern France) by Guillaume Tixier( )

1 edition published in 2005 in English and held by 2 WorldCat member libraries worldwide

L' acidification anthropique des eaux de surface : effets sur les communautés de macro invertébrés benthiques : Autoécologie et réponses d'espèces caractéristiques des ruisseaux de tête de bassin des Vosges by Guillaume Tixier( Book )

2 editions published in 2004 in French and held by 2 WorldCat member libraries worldwide

Malgré les récentes réductions des émissions des SO2 et des NOx dans l'atmosphère, l'acidification anthropique des écosystèmes d'eau douce est encore considérée comme un problème écologique majeur dans de nombreux pays de l'hémisphère Nord. Dans le massif des Vosges en tout cas, elle constitue la première cause de dégradation des écosystèmes aquatiques de tête de bassin. L'une de ses conséquences les plus marquantes réside dans l'érosion très importante de la biodiversité animale. Dans cette voie, de nombreuses études se sont focalisées sur les effets délétères de l'acidification notamment sur le compartiment des poissons et de la macrofaune benthique. Afin d'expliquer la modification des communautés de macro invertébrés, trois hypothèses ont été avancées. 1) un effet léthal ou subléthal direct de la toxicité des eaux acides ([H+], [Al] élevées). 2) un effet indirect à travers le changement des ressources nutritives 3) un effet indirect provenant de la modification des phénomènes de compétition et de prédation. Si la première hypothèse a été très bien documentée, en revanche, les effets indirects et les répercussions sur le fonctionnement de l'écosystème ont été bien moins appréhendés. Dans ce sens, les études in situ à un niveau de détermination élevée ainsi que l'autoécologie des espèces, indispensables à la compréhension de ces processus, sont demeurées rares. Ce travail montre que les réponses des macro invertébrés à l'acidification est plus complexe que préalablement évoquée. Il met en évidence notamment l'existence de taxons " acido-bénéficiaires " qui confirme en autre l'importance des effets indirects de compétition et de prédation dans la modification des communautés en milieu acidifié. En outre, ce travail apporte des connaissances fondamentales sur l'autoécologie des espèces par la détermination de leur cycle de vie et de leur rôle dans l'organisation trophique de l'écosystème acide et non acide. Il souligne alors leur nécessité dans la compréhension des processus écologiques, en général, et particulièrement dans le cadre de l'acidification, de leur rôle déterminant dans les processus de recolonisation des écosystèmes auxquels on peut s'attendre si la réhabilitation des milieux s'effectue
Identification of reference genes for RT-qPCR data normalization in Gammarus fossarum (Crustacea Amphipoda) by Kahina Mehennaoui( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Impaired Leaf Litter Processing in Acidified Streams Learning from Microbial Enzyme Activities by Hugues Clivot( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Seasonal variations overwhelm temperature effects on microbial processes in headwater streams: insights from a temperate thermal spring by Alice Gossiaux( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Vers une réévaluation des facteurs limitant la production biologique dans les cours d'eau de tête de bassin versant : nutriments, acides gras ou qualité du carbone détritique ? by Clément Crenier( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Les cours d'eau de tête de bassin versant, malgré leurs tailles réduites, jouent des rôles importants pour le fonctionnement des milieux situés en aval, et rendent de nombreux services écologiques. Depuis l'émergence du River Continuum Concept, le fonctionnement de ces cours d'eau est considéré comme reposant principalement sur les apports allochtones de matière organique détritique par opposition aux écosystèmes aval de plus grande taille dans lesquels la production primaire autochtone est considérée comme prépondérante. Bien que les détritus soient, par définition, des ressources de moindre qualité pour leurs consommateurs que les végétaux vivants, le rôle des facteurs qui limitent la production biologique et les processus fonctionnels dans ces écosystèmes détritiques reste encore peu exploré. Par exemple la carence en éléments minéraux essentiels (notamment en azote et en phosphore) dans les détritus peut limiter le développement des organismes vivants dans les cours d'eau. De ce fait, la disponibilité en éléments minéraux dans la colonne d'eau, en stimulant la croissance, l'activité des décomposeurs et la qualité élémentaire des ressources par le processus d'immobilisation microbienne, pourrait contrôler pour partie les processus écologiques en jeu dans ces écosystèmes. En étudiant in situ la réponse des communautés microbiennes aux nutriments le long d'un gradient d'occupation des sols, nos travaux ont mis en évidence un effet positif des éléments dissous (N et P) sur la décomposition des litières et les activités enzymatiques des décomposeurs, et ce même pour les niveaux en nutriments les plus élevés du gradient, pour lesquels des effets inverses étaient attendus. Indépendamment, dans des cours d'eau anciennement soumis à de forts dépôts acidifiants, nous avons pu observer une récupération du processus de décomposition des litières. Néanmoins, cette restauration s'accompagnant d'un appauvrissement marqué en N, des perturbations du fonctionnement de ces cours d'eau pourrait se manifester à terme. Le rôle de la production primaire dans les cours d'eau de tête de bassin versant a ensuite été questionné. En effet, bien qu'étant mineur quantitativement, l'apport de carbone de forte qualité pourrait jouer un rôle non négligeable sur le fonctionnement des cours d'eau de tête de bassin versant. En particulier, l'importance et le rôle des apports en acides gras polyinsaturés (AGPI) via les biofilms phototrophes ont été questionnés. En se basant sur un suivi de terrain sur 15 cours d'eau des Vosges le long d'un gradient d'acidification, nos recherches ont tout d'abord pu mettre en évidence la présence de biofilms diatomiques riches en AGPI, malgré le caractère très forestier de ces cours d'eau. Dans un second temps, une expérience en conditions contrôlées a permis d'observer le rôle positif des apports, mêmes faibles, de ressources diatomiques sur la croissance et la survie du crustacé amphipode Gammarus fossarum. Sans cet apport, ces organismes se sont avérés incapables de maintenir leurs niveaux internes d'AGPI, suggérant qu'une consommation de producteurs primaires autochtones était indispensable à ces organismes détritivores. Nos résultats ont ainsi pu mettre en évidence les rôles fondamentaux que peuvent jouer la disponibilité en éléments dissous (N et P) et la qualité du carbone dans les ressources sur la production biologique et sur le processus de décomposition des litières dans les cours d'eau de tête de bassin versant. Ces résultats appellent désormais à investiguer plus profondément les interactions entre ces deux facteurs limitants, et à comprendre dans quels contextes l'un des facteurs pourrait suppléer l'autre. En particulier, il sera intéressant de rechercher comment diverses perturbations anthropiques (xénobiotiques, réchauffement climatique etc...) pourraient affecter l'intensité ou la nature de ces limitations
L' acidification anthropique des eaux de surface : effets sur les communautés de macro invertébrés benthiques Autoécologie et réponses d'espèces caractéristiques des ruisseaux de tête de bassin des Vosges by Guillaume Tixier( )

1 edition published in 2004 in French and held by 1 WorldCat member library worldwide

Despite the recent reduction of SO2 and NOx emissions, anthropogenic acidification of freshwater ecosystems remains a major ecological problem in several countries. In the Vosges Mountains, it still represents the first cause of headwater stream perturbation. Many researches have focused on the effects of acidification on the composition and structure of macroinvertebrate communities. In this way, it has been shown that the biodiversity (richness) of most invertebrate taxonomic groups has been severely impoverished in acidified ecosystems. To explain the modification of invertebrate assemblages, different types of response (not exclusive) have been proposed. 1) direct lethal and sublethal effects of acidification (i.e. high [H+] and [Al] and low [Ca]) leading to the disruption of important physiological functions (e.g. ion-regulation, respiration), 2) indirect effects through changes in the quality and quantity of aquatic food resources. 3) indirect effects resulting from change in biotic interactions such as competition and/or predation. If the first hypothesis has been well studied, indirect effects and their consequences on ecosystem functioning have received little interest. In fact, studies performed on the field and using high level of taxon determination as well as autoecological aspects which are essential to understand these processes remain scarce. Our study accounts for more complex responses of macro invertebrates to acidification than previously reported. In particular, it reveals that some given taxa could be “acid-benefiting”. In this way, it confirms the major importance of indirect effects such as competition and predation leading to the modification of macro-invertebrate assemblages in acidic ecosystems. Moreover, it provides important informations on several autoecological traits, especially concerning their life history and feeding habits in pristine and acidified ecosystems. Our study emphasizes the crucial need of such fundamental aspects in understanding ecological processes, in particular when assessing the effects of freshwater acidification, and in the future the possible recovery of running water ecosystems from acidification
Les possibilités de dispersion et éléments d'habitat-refuge dans un paysage d'agriculture intensive fragmenté par un réseau routier dense : le cas de la petite faune dans la plaine du Bas-Rhin by Jonathan Jumeau( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

Habitats and landscape fragmentation, caused by linear land transports infrastructures, is one of the major cause for the current loss of biodiversity. Among those infrastructures, road is a major cause of fragmentation, especially as it possess specific traffic-linked effects, which induces wildlife-vehicles collisions and landscape pollution. In order to decrease those negative effects, mitigation measures are taken, among which wildlife crossings, enabling wildlife to cross the road. Road also creates new potential habitats for small wildlife species in anthropogenic and fragmented landscapes. In this essay are shown (1) the potential as habitat of different road-linked elements; (2) the possibility to anticipate wildlife-vehicles collisions in order to improve the position of mitigation measures; (3) the importance of methodology in the evaluation of wildlife crossings effectiveness; and (4) the possibility to improve existing wildlife crossings. Those results will allow improving landscape defragmentation strategies
Silver nanoparticles impact the functional role of Gammarus roeseli (Crustacea Amphipoda)( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Apport de la bioacoustique pour le suivi d'une espèce discrète : le Loup gris (Canis lupus) by Morgane Papin( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

The growing number of studies carried out in recent years has shown that bioacoustics is particularly interesting for the monitoring of secretive species. The emergence of autonomous recording devices, combined with new methods of analysis, have recently contributed to the increase of studies in this field. Over the last 30 years, many bioacoustic studies have been developed for the Grey wolf (Canis lupus), a secretive large carnivore known for its howls spreading over distances up to several kilometers. These researches notably aimed to improve its monitoring, which is complex because of the strong wolf dispersal capacities over long distances, the large extent of their territories and the various natural contexts in which they live. In this context, this PhD thesis was organized around three research axes. The first two axes focused on the contribution of passive bioacoustics for the Grey wolf monitoring in the field. By combining acoustic, statistical and cartographic analysis, the first objective was to develop a spatial sampling method adapted to large study areas for the detection of wolf howls by using autonomous recorders. Then, the same protocol was used to investigate the possibility to localize wolves thanks to their howls. Field experimentations, conducted in mid-mountain (Massif des Vosges) and lowland (Côtes de Meuse) environments, in two study areas of 30 km² and with an array of 20 autonomous recorders, demonstrated the high potential of passive bioacoustics for the Grey wolf monitoring. Indeed, nearly 70% of broadcasts (synthetic sound with similar acoustic properties to howls) were detected by at least one autonomous recorder in mid-mountain environment and more than 80% in lowland environment, for sound source-recorders distances of up to 2.7 km and 3.5 km respectively. By using statistical model and Geographic Information System, the detection probability of wolf howls was modeled in both study areas. In the mid-mountain environment, this detection probability was high or very high (greater than 0.5) in 5.72 km² of the study area, compared with 21.43 km² in lowland environment. The broadcast sites were localized with an overall mean accuracy of 315 ± 617 (SD) m, reducing until 167 ± 308 (SD) m after setting a temporal error threshold defined from the data distribution. The third axe focused on the application of acoustic diversity indices to estimate the number of howling wolves in choruses and thus to contribute to pack size monitoring. Index values of the six indices (H, Ht, Hf, AR, M, and ACI) were positively correlated with the number of howling wolves in the artificial tested choruses. Interesting size predictions based on real choruses were obtained with one of the indices (ACI). The effects of several biases on the reference values for the acoustic indices were then explored, showing that three of them were relatively insensitive (Hf, AR and, ACI). Finally, results obtained with autonomous recorders confirm the real potential of passive acoustic methods for detecting the presence of wolves but also for localizing individuals with high precision, in contrasting natural environments, at large spatial and temporal scales. The use of acoustic diversity indices also opens new perspectives for estimating pack sizes. All of the promising methods emerging from this thesis require now further investigations before considering a concrete application for monitoring the Grey wolf in its natural environment
Impact d'amendements calco-magnésiens sur la diversité des macroinvertébrés de sols forestiers et sur certains processus fonctionnels associés. Cas du massif vosgien (nord-est, France) by Apolline Auclerc( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

The use of liming (Ca-Mg) on acidified forest can be interesting to counteract soil acidification and loss of nutrients caused by decades of acid atmospheric deposition. In this context, the aims of this work were to assess liming effect on (i) taxonomical diversity and community structure of soil macro-invertebrates and on (ii) two associated functional processes related to earthworms: soil structuration and humus evolution. The PhD project was realised in three sites from the Vosges mountains (North-eastern, France): two forest mountain catchments (one lying on sandstone and the other on granite) limed in 2003 and the public hill forest of Humont at a lower altitude limed in 1991 and 2008. Results showed that 4 years after liming in mountain forest, the total abundance of macro-invertebrates decreased, while the species richness were similar. However, the community structure strongly differed, and less than 50% of the species were common to limed and control sites. Moreover, 43 species appeared to be indicators of liming. Predator taxa abundance decreased whereas the detritivorous were favoured by lime addition. The in vitro experiments showed a positive effect of liming on soil structuration by earthworm activities (cast production and burrowing activities). In the Humont forest, liming at medium-term (4 years) and long term (20 years) have an important effect on the Aporrectodea velox population, an endemic vosgian species. Related to its high biomass, this increase strongly improved soil physicochemical parameters such as soil structure and humus morphology
La synécoparcimonie : un outil d'évaluation biologique de la qualité des eaux courantes : Théorie et applications by Gérard Masselot( Book )

1 edition published in 2002 in French and held by 1 WorldCat member library worldwide

A new freshwater biomonitoring tool, the synecoparsimony method, is proposed and tested. The methodological bases are explained. Its validity is tested on several real cases, of various geographical origins (neartic and west-palearctic). It is shown that this method can be used as well to analyze faunistic data as microfloristic. The new tool makes it possible to minimize the ad hoc hypothesis. It enables direct and rigorous confrontation between biological data and the mesologic characteristics of the rivers. The concept of “bio-indicator” taxa is discussed, and the concept of “significant taxa” is proposed. The new European freshwater biomonitoring tools ara studied and criticized. It is shownthat the new suggested method can allow a relevant approach of the quality of water and/or of aquatic environments. Its validity field is specified, and the complementary studies necessary to improve this new tool are exposed. The need for the use of “total evidence” matrices of qualitative biological data, necessary including “rare” taxa, is shown. The specific level of determination of taxa is confirmed as being the most informative. The method we propose could be integrated as a complementary tool available for freshwater managers in Europe
Biodiversité et fonctionnement de cours d'eau forestiers de tête de bassin : effet de l'acidification anthropique et d'une restauration by Jean-Marc Baudoin( Book )

1 edition published in 2007 in French and held by 1 WorldCat member library worldwide

Facing the current species extinction, the comprehension of mechanisms linking biodiversity to ecosystem functioning has become essential. Despite a reduction of SO2 and NOx atmospheric emissions, acidification of surface waters remains a major cause of biodiversity erosion. This situation is worrying in the Vosges Mountains, where air spreading of improvements was adopted like a potential alternative. Hence, 2 catchments have received calco-magnesian inputs. Proximity of acidified, restored and healthy ecosystems can provide opportunities to investigate biodiversity/function relationships, in situ. Allochthonous organic matter decomposition which is mainly mediated by aquatic hyphomycetes and detritivore invertebrates, represents a key process driving the functioning of headwater streams. A leaf breakdown experiment was conducted in 6 streams characterized by different acidification levels, before and after that two of them were limed. Our results show that acidification affect leaf breakdown rate, as well as detritivores and decomposers communities, particularly hyphomycetes diversity. The water quality improvement of one limed stream was rapidly accompanied by fungal recolonization and partial functional recovery. Our findings reveal a significant relationship between aquatic hyphomycete richness and breakdown rate. Their diversity could enhance this process by increasing litter palatability for certain shredders. A hypothetical "fungal diversity dependent" food web linkage was proposed
Understanding the impact of engineered nanoparticles Gammarus sp. as a valuable non-vertebrate model? by Kahina Mehennaoui( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

The potential toxicity of nanomaterials is of high societal and scientific interest due to the promise of ground-breaking innovations for many technical applications. However, toxicity can often not be related to the actual size, mass or surface area of the single nanoparticles (NPs) or the NP agglomerates. Therefore, it can be proposed that the toxicity is greatly influenced by other inherent and non-understood properties of the particles to which ions dissolving from the particle, surface or molecules adhering to the surface interfering with the uptake of NPs into cells, may have important contributions. The PhD project “NANOGAM”, closely linked up to CORE2012 NANION project that aims to obtain knowledge to understand some of the processes and factors involved in NP uptake and toxicity as such understanding is a prerequisite for the development of nanomaterials following the safer-by-design philosophy. This PhD project aims to investigate, based on known characteristics of the key physico-chemical parameters; as size and surface functionalities, of a well-chosen list of silver and gold NPs, the uptake, and dependent biological effects of different complexity (mortality, behavioural effects, physiological effects, transcriptomic effects, etc.), on a sensitive species; Gammarus fossarum (Crustacea Amphipoda), in order to understand to which extent toxicity of nanomaterials is due to intrinsic material properties or ion leaching. Such understanding will contribute to the prediction of toxicity based on material properties rather than repetitive testing of an indefinite number of new nanomaterials. G. fossarum were exposed at low concentrations of AgNPs and AuNPs for 72h or 15 days in presence or absence of food. The obtained results showed that (i) surface coating is the main factor governing AgNPs and AuNPs uptake by G. fossarum, (ii) both released ions and NPs themselves play a role in the potency of the studied AgNPs and AuNPs and (iii) chemical composition led to different effects at the sub-individual levels (target genes expression) and different tissue distribution as AgNPs were found in G. fossarum gills while AuNPs were found in the intestinal caeca. Additionally, this work shows that Gammarus sp. are valuable models for the study of the effects of AgNPs and AuNPs
 
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French (18)

English (8)