Résumé
This study presents the occurrence and abundance of Aeromonas antibiotic-resistant bacteria (ARB) and genes (ARGs) isolated from water, biofilm and fish in two commercial trout farms before and one week after flumequine treatment. Wild (WT) and non-wild (NWT) strains were determined for quinolones (flumequine, oxolinic acid and enrofloxacin), oxytetracycline (OXY), florfenicol (FFN), trimethoprim-sulfamethoxazole (TMP) and colistin (COL), and pMAR (presumptive multi-resistant) strains were classified. Forty-four ARGs for the mentioned antibiotics, β-lactams and multi-resistance were quantified for 211 isolates. BlaSHV-01, mexF and tetE were the dominant ARGs. A greater occurrence and abundance of tetA2, sul3, floR1, blaSHV-01 and mexF were observed for NWT compared to WT. The occurrence of pMAR and NWT Aeromonas for quinolones, OXY, FFN, TMP, COL and ARGs depended on the Aeromonas origin, antibiotic use and the presence of upstream activities. Our results revealed the impact of a flumequine treatment on Aeromonas present on a fish farm through an increase in NWT and pMAR strains. The link between fish and their environment was shown by the detection of identical ARB and ARGs in the two types of samples. There appears to be a high risk of resistance genes developing and spreading in aquatic environments.
Auteurs, date et publication :
Auteurs Niki Hayatgheib , Ségolène Calvez , Catherine Fournel , Lionel Pineau , Hervé Pouliquen , Emmanuelle Moreau
Publication : Microorganisms
Date : 2021
Volume : 9
Issue : 6
Pages : 1201
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
DNA-based snapshots of ancient vegetation have shown that the composition of high-latitude plant communities changed considerably during the late Quaternary. However, parallel changes in biotic interactions remain largely uninvestigated. Here we show how mutualisms involving plants and heterotrophic organisms varied during the last 50,000 years. During 50–25 ka BP, a cool period featuring stadial-interstadial fluctuations, arbuscular mycorrhizal and non-N-fixing plants predominated. During 25-15 ka BP, a cold, dry interval, the representation of ectomycorrhizal, non-mycorrhizal and facultatively mycorrhizal plants increased, while that of N-fixing plants decreased further. From 15 ka BP, which marks the transition to and establishment of the Holocene interglaciation, representation of arbuscular mycorrhizal plants decreased further, while that of ectomycorrhizal, non-mycorrhizal, N-fixing and wind-pollinated plants increased. These changes in the mutualist trait structure of vegetation may reflect responses to historical environmental conditions that are without current analogue, or biogeographic processes, such as spatial decoupling of mutualist partners.
Auteurs, date et publication :
Auteurs Martin Zobel , John Davison , Mary E Edwards , Christian Brochmann , Eric Coissac , Pierre Taberlet , Eske Willerslev , Mari Moora
Publication : Nature Communications
Date : 2025
Volume : 9
Issue : 1
Pages : 139
Catégorie(s)
#CNRS #eDNARésumé
Territorial behaviour has been widely described across many animal taxa, where the acquisition and defence of a territory are critical for the fitness of an individual. Extensive evidence suggests that androgens (e.g. testosterone) are involved in the modulation of territorial behaviour in male vertebrates. Short-term increase of androgen following a territorial encounter appears to favour the outcome of a challenge. The “Challenge Hypothesis” proposed by Wingfield and colleagues outlines the existence of a positive feedback relationship between androgen and social challenges (e.g. territorial intrusions) in male vertebrates. Here we tested the challenge hypothesis in the highly territorial poison frog, Allobates femoralis, in its natural habitat by exposing males to simulated territorial intrusions in form of acoustic playbacks. We quantified repeatedly androgen concentrations of individual males via a non-invasive water-borne sampling approach. Our results show that A. femoralis males exhibited a positive behavioural and androgenic response after being confronted to simulated territorial intrusions, providing support for the Challenge Hypothesis in a territorial frog.Competing Interest StatementThe authors have declared no competing interest.
Auteurs, date et publication :
Auteurs Camilo Rodríguez , Leonida Fusani , Gaëlle Raboisson , Walter Hödl , Eva Ringler , Virginie Canoine
Publication : bioRxiv
Date : 2020
Pages : 2020.11.15.383364
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs O. Guillaume , A. Coulon , J.-F. Le Galliard , J. Clobert , J. F. Le Galliard , F. Gaill , J. M. Guarini
Date : 2025
Pages : 43-61
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Christophe Girod , Danilo Matzke
Publication : Zoosystema
Date : 2025
Volume : 42
Issue : 4
Pages : 57-76
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Warning signals are well known in the visual system, but rare in other modalities. Some moths produce ultrasonic sounds to warn bats of noxious taste or to mimic unpalatable models. Here, we report results from a long-term study across the globe, assaying moth response to playback of bat echolocation. We tested 252 genera, spanning most families of large-bodied moths, and document anti-bat ultrasound production in 52 genera, with eight subfamily origins described. Based on acoustic analysis of ultrasonic emissions and palatability experiments with bats, it seems that acoustic warning and mimicry are the raison d'être for sound production in most moths. However, some moths use high-duty-cycle ultrasound capable of jamming bat sonar. In fact, we find preliminary evidence of independent origins of sonar jamming in at least six subfamilies. Palatability data indicate that jamming and warning are not mutually exclusive strategies. To explore the possible organization of anti-bat warning sounds into acoustic mimicry rings, we intensively studied a community of moths in Ecuador and, using machine-learning approaches, found five distinct acoustic clusters. While these data represent an early understanding of acoustic aposematism and mimicry across this megadiverse insect order, it is likely that ultrasonically signaling moths comprise one of the largest mimicry complexes on earth.
Auteurs, date et publication :
Auteurs Jesse R. Barber , David Plotkin , Juliette J. Rubin , Nicholas T. Homziak , Brian C. Leavell , Peter R. Houlihan , Krystie A. Miner , Jesse W. Breinholt , Brandt Quirk-Royal , Pablo Sebastián Padrón , Matias Nunez , Akito Y. Kawahara
Publication : Proceedings of the National Academy of Sciences
Date : 2022
Volume : 119
Issue : 25
Pages : e2117485119
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Yu Bai , Stefano Tebaldini , Dinh Ho Tong Minh , Wen Yang
Publication : IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Date : 2025
Issue : 99
Pages : 1-7
Catégorie(s)
#CIRAD #CNRS #FORET Nouragues #FORET ParacouAuteurs, date et publication :
Auteurs Isabelle Maréchaux , Jérôme Chave
Publication : Ecological Monographs
Date : 2023
Volume : 87
Issue : 4
Pages : 632-664
Catégorie(s)
#CNRS #FORET Nouragues #FORET ParacouAuteurs, date et publication :
Auteurs Matieu Henry , Maxime Réjou-Méchain , Miguel Cifuentes Jara , Craig Wayson , Daniel Piotto , James Westfall , José María Michel Fuentes , Federico Alice Guier , Héctor Castañeda Lombis , Edwin Castellanos López
Publication : Annals of Forest Science
Date : 2025
Volume : 72
Issue : 6
Pages : 779-788
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Mario X Ruiz‐González , Jérémie Lauth , Céline Leroy , Alain Jauneau , Hervé Gryta , Patricia Jargeat , Alain Dejean , Jérôme Orivel
Publication : Journal of Basic Microbiology
Date : 2025
Volume : 53
Issue : 1
Pages : 98-100