Résumé
Abstract
Animal personality traits are sometimes linked to an individual’s degree of plasticity, with certain personality types being more plastic than others. In territorial species, consistently high levels of aggression might increase the risk of harmful fights, while consistently low aggression might lead to the loss of a territory. Consequently, reacting plastically with an appropriate territorial response should be beneficial to avoid these risks. An integrative investigation of both personality traits and plasticity can help us better understand the dynamics of aggressive interactions during male-male competition. Here, we used a free-ranging Neotropical poison frog population to investigate the role of plasticity in male territorial aggression towards intruders. We conducted repeated standardized territorial intrusion experiments mimicking frogs of different body sizes via playback calls with different peak frequencies. We found individual repeatability for the latency to reach and approach a simulated intruder and observed that both aggressive and less aggressive males decreased their level of aggression towards big intruders. However, our results do not support a correlation between personality and plasticity in the context of male territory defense during the breeding season. We discuss how such a correlation between personality and plasticity might be conditional on the costs and benefits across contexts.
Auteurs, date et publication :
Auteurs Mélissa Peignier , Lauriane Bégué , Max Ringler , Birgit Szabo , Eva Ringler
Publication : Scientific Reports
Date : 2023
Volume : 13
Issue : 1
Pages : 3435
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Florian C. Boucher , Wilfried Thuiller , Cristina Roquet , Rolland Douzet , Serge Aubert , Nadir Alvarez , Sébastien Lavergne
Publication : Evolution
Date : 2025
Volume : 66
Issue : 4
Pages : 1255-1268
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Tatsuya Otani , Adriano JN Lima , Rempei Suwa , Marcio RM Amaral , Shinta Ohashi , Alberto CM Pinto , Joaquim Dos Santos , Takuya Kajimoto , Niro Higuchi , Moriyoshi Ishizuka
Publication : iForest-Biogeosciences and Forestry
Date : 2025
Volume : 11
Issue : 3
Pages : 352
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs S McCann , C Scott , T Jones , O Moeri , S O’Donnell , G Gries
Publication : Insectes sociaux
Date : 2025
Volume : 62
Issue : 1
Pages : 101-108
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Emerging organic micropollutants (OMPs) are ubiquitous in waterbodies and not fully eliminated by wastewater treatment plants (WWTP). A proposed WWTP upgrade includes OMPs sorption by biochar rather than activated carbon (AC). Activated biochar (AB) and non-activated biochar (NAB) sorption performance towards 4 target OMPs (benzotriazole, sulfamethoxazole, carbamazepine, diclofenac) were evaluated in real-wastewater. Sorption processes are discussed in light of sorption mechanisms that depend both on OMP and on biochar physico-chemical properties. AB and AC have similar average sorption efficiency (45%), while NABs are much less efficient (<19%). OMPs sorption significantly correlates to SSA, inversely to H/C (indicating hydrophobic interaction with graphene-like structures) and to CEC or ash content (indicating H-bond or ternary surface complexation sorption mechanisms). This highlights the need to mix AB sources with different physico-chemical characteristics to sorb a large OMP spectrum within WWTPs. Production and use of ABs alleviate the negative environmental impact of ACs.
Auteurs, date et publication :
Auteurs Fabienne Favre , Ana Slijepcevic , Umberto Piantini , Urban Frey , Samuel Abiven , Hans-Peter Schmidt , Laurent Charlet
Publication : Bioresource Technology Reports
Date : 2025
Volume : 17
Pages : 100966
Catégorie(s)
#CNRS #Ecotron IleDeFrance #ENSRésumé
Environmental contamination by xenobiotics represents a major threat for natural ecosystems and public health. In response, xenobiotic detoxification is a fundamental trait of organisms for developmental plasticity and stress tolerance, but the underlying molecular mechanisms remain poorly understood in plants. To decipher this process, we explored the consequences of allopolyploidy on xenobiotic tolerance in the genus Spartina Schreb. Specifically, we focused on microRNAs (miRNAs) owing to their central function in the regulation of gene expression patterns, including responses to stress. Small RNA-Seq was conducted on the parents S. alterniflora and S. maritima, their F1 hybrid S. x townsendii and the allopolyploid S. anglica under phenanthrene-induced stress (phe), a model Polycyclic Aromatic Hydrocarbon (PAH) compound. Differentially expressed miRNAs in response to phe were specifically identified within species. In complement, the respective impacts of hybridization and genome doubling were detected, through changes in miRNA expression patterns between S. x townsendii, S. anglica and the parents. The results support the impact of allopolyploidy in miRNA-guided regulation of plant response to phe. In total, we identified 17 phe-responsive miRNAs in Spartina among up-regulated MIR156 and down-regulated MIR159. We also describe novel phe-responsive miRNAs as putative Spartina-specific gene expression regulators in response to stress. Functional validation using Arabidopsis (L.) Heynh. T-DNA lines inserted in homologous MIR genes was performed, and the divergence of phe-responsive miRNA regulatory networks between Arabidopsis and Spartina was discussed.
Auteurs, date et publication :
Auteurs Armand Cavé-Radet , Armel Salmon , Loup Tran Van Canh , Richard L. Moyle , Lara-Simone Pretorius , Oscar Lima , Malika L. Ainouche , Abdelhak El Amrani
Publication : Plant Molecular Biology
Date : 2023
Volume : 111
Issue : 3
Pages : 309-328
Catégorie(s)
#CNRS #EcoGenO #Université de RennesAuteurs, date et publication :
Auteurs Simon J O’hanlon , Adrien Rieux , Rhys A Farrer , Gonçalo M Rosa , Bruce Waldman , Arnaud Bataille , Tiffany A Kosch , Kris A Murray , Balázs Brankovics , Matteo Fumagalli
Publication : Science
Date : 2025
Volume : 360
Issue : 6389
Pages : 621-627
Catégorie(s)
#CNRS #FORET NouraguesRésumé
A better understanding of stem growth phenology and its climate drivers would improve projections of the impact of climate change on forest productivity. Under a Mediterranean climate, tree growth is primarily limited by soil water availability during summer, but cold temperatures in winter also prevent tree growth in evergreen forests. In the widespread Mediterranean evergreen tree species Quercus ilex, the duration of stem growth has been shown to predict annual stem increment, and to be limited by winter temperatures on the one hand, and by the summer drought onset on the other hand. We tested how these climatic controls of Q. ilex growth varied with recent climate change by correlating a 40-year tree ring record and a 30-year annual diameter inventory against winter temperature, spring precipitation, and simulated growth duration. Our results showed that growth duration was the best predictor of annual tree growth. We predicted that recent climate changes have resulted in earlier growth onset (À10 days) due to winter warming and earlier growth cessation (À26 days) due to earlier drought onset. These climatic trends partly offset one another, as we observed no significant trend of change in tree growth between 1968 and 2008. A moving-window correlation analysis revealed that in the past, Q. ilex growth was only correlated with water availability, but that since the 2000s, growth suddenly became correlated with winter temperature in addition to spring drought. This change in the climate–growth correlations matches the start of the recent atmospheric warming pause also known as the ‘climate hiatus’. The duration of growth of Q. ilex is thus shortened because winter warming has stopped compensating for increasing drought in the last decade. Decoupled trends in precipitation and temperature, a neglected aspect of climate change, might reduce forest productivity through phenological constraints and have more consequences than climate warming alone.
Auteurs, date et publication :
Auteurs Morine Lempereur , Jean-Marc Limousin , Frédéric Guibal , Jean-Marc Ourcival , Serge Rambal , Julien Ruffault , Florent Mouillot
Publication : Global Change Biology
Date : 2025
Volume : 23
Issue : 1
Pages : 42-55
Catégorie(s)
#CNRS #FORET PuechabonRésumé
Treatment with antibiotics leads to the selection of isolates with increased resistance. We investigated if evolution towards resistance was associated with virulence changes, in the context of P. aeruginosa ventilator-associated pneumonia (VAP). Four patients were selected because they had multiple VAP episodes during short periods (12 days to 5 weeks), with emergence of resistance. We performed whole-genome sequencing of 12 P. aeruginosa from bronchoalveolar lavages or blood culture (3 isolates per patient). Production of quorum sensing-dependent virulence factors, serum resistance, cytotoxicity against A549 cells, biofilm production, and twitching motility were studied. Each patient was infected with a unique strain. For all patients, resistance development was explained by genetic events in ampD, mexR or oprD. Additional variations were detected in virulence- and/or fitness-associated genes (algB, gacA, groEL, lasR, mpl, pilE, pilM, rhlR) depending on the strain. We noticed a convergence towards quorum sensing deficiency, correlated with a decrease of pyocyanin and protease production, survival in serum, twitching motility and cytotoxicity. In one patient, changes in pilM and pilE were related to enhanced twitching. We show that the emergence of resistance in P. aeruginosa is associated with virulence modification, even in acute infections. The consequences of this short-term pathoadaptation need to be explored.
Auteurs, date et publication :
Auteurs Elise Persyn , Mohamed Sassi , Marc Aubry , Martin Broly , Sandie Delanou , Karim Asehnoune , Nathalie Caroff , Lise Crémet
Publication : Scientific Reports
Date : 2019
Volume : 9
Issue : 1
Pages : 4720
Catégorie(s)
#CNRS #EcoGenO #Université de RennesAuteurs, date et publication :
Auteurs Christopher Baraloto , Quentin Molto , Suzanne Rabaud , Bruno Hérault , Renato Valencia , Lilian Blanc , Paul V. A. Fine , Jill Thompson
Publication : Biotropica
Date : 2013
Volume : 45
Issue : 3
Pages : 288–298