Gérard Fonty

Research Field

Degradation

10.1051/animres:199505122

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Stratification of Archaea in the Deep Sediments of a Freshwater Meromictic Lake: Vertical Shift from Methanogenic to Uncultured Archaeal Lineages

PLoS ONE (2012)

Guillaume Borrel Anne‐Catherine Lehours Olivier Crouzet Didier Jézéquel Karl J. Rockne

As for lineages of known methanogens, several lineages of uncultured archaea were recurrently retrieved in freshwater sediments. However, knowledge is missing about how these lineages might be affected and structured according to depth. In the present study, the vertical changes of archaeal communities were characterized in the deep sediment of the freshwater meromictic Lake Pavin. For that purpose, an integrated molecular approach was performed to gain information on the structure, composition, abundance and vertical stratification of archaeal communities thriving in anoxic freshwater sediments along a gradient of sediments encompassing 130 years of sedimentation. Huge changes occurred in the structure and composition of archaeal assemblages along the sediment core. Methanogenic taxa (i.e. Methanosaeta and Methanomicrobiales) were progressively replaced by uncultured archaeal lineages (i.e. Marine Benthic Group-D (MBG-D) and Miscellaneous Crenarchaeal Group (MCG)) which are suspected to be involved in the methane cycle.

Methanosaeta

Methanomicrobiales

Euryarchaeota

Crenarchaeota

10.1371/journal.pone.0043346

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Citations (80)

Transcriptome méthanogène pour réduire les émissions de méthane par les ruminants

HAL (Le Centre pour la Communication Scientifique Directe) (2016)

Milka Popova Diego Morgavi N. Costedoat‐Chalumeau Jean‐Pierre Morel Gérard Fonty

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Rôle de la microflore sur la cinétique d'apparition des protozoaires ciliés dans le rumen de l'agneau

annales de biologie animale biochimie biophysique (1986)

Gérard Fonty P. Gouët J.P. Jouany J. Sénaud

10.1051/rnd:19860220

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Citations (3)

Hydrolysis and degradation of esterified phenolic acids from the maize cell wall by rumen microbial species

annales de biologie animale biochimie biophysique (1997)

I. Giraud JM Besle Gérard Fonty

Degradation

Hydrolytic degradation

10.1051/rnd:19970733

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Citations (4)

Rumen methanogens display species-specific methane production kinetics

HAL (Le Centre pour la Communication Scientifique Directe) (2016)

Milka Popova Maxence Tillier Dominique Graviou Diego Morgavi Gérard Fonty

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Degradation of maize stem by two rumen fungal species, Piromyces communis and Caecomyces communis, in pure cultures or in association with cellulolytic bacteria

annales de biologie animale biochimie biophysique (1992)

V. Roger E. Grenet Jacqueline JAMOT Annick Bernalier Gérard Fonty

Fibrobacter succinogenes

10.1051/rnd:19920402

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Citations (26)

Isolation and characterization of fermentative bacteria from the intestine of two edible snails, Helix pomatia and Cantareus aspersus (Gastropoda: Pulmonata).

HAL (Le Centre pour la Communication Scientifique Directe) (2006)

Maryvonne Charrier Gérard Fonty Brigitte Gaillard-Martinie Abdelkader Aïnouche Gerard Andant

Helix pomatia

Isolation

Helix (gastropod)

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Colony counts and characterization of bacteria adherent to the rumen wall and desquamated epithelial cells in conventional young lambs

Canadian Journal of Microbiology (1989)

Francoise Rieu Gérard Fonty Ph. Gouet

Characterization and enumeration of the adherent epimural community of the rumen wall of young, conventionally reared lambs were carried out from 2 to 21 days after birth. Three hundred strains were isolated by anaerobic procedures from three sites: dorsal, ventral, and caudal sacs, and from the sloughed epithelial cells. The population of epimural bacteria was very dense from the first days of the lamb's life. This population increased slightly with age. During the first week the counts were similar in the dorsal and ventral sacs, but they were 10 to 100 times lower in the caudal sac. Total counts for anaerobic bacteria were higher than the counts for aerobic bacteria. The isolated strains were distributed into 19 groups: 11 groups included aerotolerant strains, and 8 others, strictly anaerobic strains. During the first week the facultative microflora was mainly composed of Escherichia coli and Streptococci. Later, the epimural community was more complex and included Staphyloccus, Micrococcus, and Gaffkya. The strictly anaerobic microflora was mainly composed of Clostridium, Peptostreptococcus, Veillonella, Propionibacterium, and Acidaminococcus. Some of these strains appeared to be similar to those previously isolated from the rumen fluid of young lambs; however, the genera Micrococcus, Veillonella, Gaffkya, and Acidaminococcus, and E. coli seemed to be specific of the rumen wall tissues.Key words: rumen, lamb, microflora, rumen wall.

Veillonella

Peptostreptococcus

Fusobacterium

Propionibacterium

10.1139/m89-114

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Effects of a strain of Saccharomyces cerevisiae (levucell SC), a microbial additive for ruminants, on lactate metabolism in vitro

HAL (Le Centre pour la Communication Scientifique Directe) (1996)

Frédérique Chaucheyras Jean‐Michel Salmon Gérard Fonty P. Gouet Gaelle Bertin

Strain (injury)

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