Auteurs, date et publication :
Auteurs Peter Streb , Gabriel Cornic , Cornelius Lütz
Date : 2025
Pages : 75-97
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Cony Decock , Mario Amalfi , Gerardo Robledo , Gabriel Castillo
Publication : Cryptogamie, Mycologie
Date : 2025
Volume : 34
Issue : 1
Pages : 15-27
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Alain Lenoir , Raphaël Boulay , Alain Dejean , Axel Touchard , Virginie Cuvillier-Hot
Publication : Environmental Science and Pollution Research
Date : 2025
Volume : 23
Issue : 16
Pages : 16865-16872
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Drought frequency and intensity are expected to increase in the Mediterranean as a consequence of global climate change. To understand how photosynthetic capacity responds to long-term water stress, we measured seasonal patterns of stomatal (SL), mesophyll (MCL) and biochemical limitations (BL) to net photosynthesis (Amax) in three Quercus ilex (L.) populations from sites differing in annual rainfall. In the absence of water stress, stomatal conductance (gs), maximum carboxylation capacity (Vcmax), photosynthetic electron transport rate (Jmax) and Amax were similar among populations. However, as leaf predawn water potential (Ψl,pd) declined, the population from the wettest site showed steeper declines in gs, Vcmax, Jmax and Amax than those from the drier sites. Consequently, SL, MCL and BL increased most steeply in response to decreasing Ψl,pd in the population from the wettest site. The higher sensitivity of Amax to drought was primarily the result of stronger stomatal regulation of water loss. Among-population differences were not observed when gs was used instead of Ψl,pd as a drought stress indicator. Given that higher growth rates, stature and leaf area index were observed at the wettest site, we speculate that hydraulic architecture may explain the greater drought sensitivity of this population. Collectively, these results highlight the importance of considering among-population differences in photosynthetic responses to seasonal drought in large scale process-based models of forest ecosystem function.
Auteurs, date et publication :
Auteurs Nicolas K. Martin-StPaul , Jean-Marc Limousin , Jesús Rodríguez-Calcerrada , Julien Ruffault , Serge Rambal , Matthew G. Letts , Laurent Misson
Publication : Functional Plant Biology
Date : 2012
Volume : 39
Issue : 1
Pages : 25-37
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Andrew J. Helmstetter , Alexander S. T. Papadopulos , Javier Igea , Tom J. M. Van Dooren , Armand M. Leroi , Vincent Savolainen
Publication : Nature Communications
Date : 2016
Volume : 7
Pages : 11271
Catégorie(s)
#CNRS #ENS #PLANAQUARésumé
1. Parenting is costly and because the relationship between the mother and embryos is not mutualistic, mother-offspring conflicts may exist whenever resource are scarce. However, intergenerational trade-offs and conflicts resulting from limited access to water, a vital and depreciable resource, remain largely overlooked. 2. In this study, we examined the physiological, reproductive and life-history responses to water restriction in the European Common Lizard (Zootoca vivipara). We hypothesized that, under water-limited conditions, pregnant females experience both short-term and long-term physiological impacts (dehydration and stress) underlying an allocation trade-off for water between mothers and offspring. 3.Water restriction led to a decrease in body mass, and an increase in plasma osmolality (dehydration) and corticosterone concentration in both males and females. The extent of the dehydration was positively correlated with fecundity in females. This suggests a trade-off between maternal water balance and allocation of water to developing embryos during reproduction. 4. Water restriction had no immediate effect on reproductive output or offspring morphology at birth. Yet, water restriction in pregnant females enhanced their reproductive effort the following year but reduced the early life growth and annual survival of their second-year offspring. 5. These delayed fitness responses to water restriction in offspring and mothers suggest that water can trigger intergenerational conflicts as demonstrated for energy. Although the mediation of this conflict remains to be clarified, we hypothesized that it represents a selective force that influences reproductive strategies.
Auteurs, date et publication :
Auteurs Andreaz Dupoue , Jean-Francois Le Galliard , Remy Josserand , Dale F. DeNardo , Beatriz Decenciere , Simon Agostini , Claudy Haussy , Sandrine Meylan
Publication : FUNCTIONAL ECOLOGY
Date : 2018
Volume : 32
Issue : 3
Pages : 676-686
Catégorie(s)
#ANR-Citation #CEREEP #CNRS #ENSRésumé
Tree species distribution, and hence forest biodiversity, relies on the reproductive capacity of trees, which is currently affected by climate change. Drought-induced pollen sterility could increase as a consequence of more intense and more frequent droughts projected for temperate and Mediterranean regions, and threaten the sexual regeneration of trees in these regions. To evaluate this possibility, we examined the effect of long-term partial rainfall exclusion (À27% precipitation) on male reproductive development in holm oak, Quercus ilex, one of the most important and widespread tree species of the Mediterranean region.
Auteurs, date et publication :
Auteurs O. Bykova , J.-M. Limousin , J.-M. Ourcival , I. Chuine , S. Pfautsch
Publication : Plant Biology
Date : 2025
Volume : 20
Issue : 3
Pages : 450-455
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Adriane Aupic‐Samain , Virginie Baldy , Ninon Delcourt , Paul Henning Krogh , Thierry Gauquelin , Catherine Fernandez , Mathieu Santonja
Publication : Functional Ecology
Date : 2025
Volume : 35
Issue : 7
Pages : 1550-1559
Catégorie(s)
#CNRS #FORET O3HPRésumé
Climate warming and landscape fragmentation are both factors well known to threaten biodiversity and to generate species responses and adaptation. However, the impact of warming and fragmentation interplay on organismal responses remains largely under-explored, especially when it comes to gut symbionts, which may play a key role in essential host functions and traits by extending its functional and genetic repertoire. Here, we experimentally examined the combined effects of climate warming and habitat connectivity on the gut bacterial communities of the common lizard (Zootoca vivipara) over three years. While the strength of effects varied over the years, we found that a 2°C warmer climate decreases lizard gut microbiome diversity in isolated habitats. However, enabling connectivity among habitats with warmer and cooler climates offset or even reversed warming effects. The warming effects and the association between host dispersal behaviour and microbiome diversity appear to be a potential driver of this interplay. This study suggests that preserving habitat connectivity will play a key role in mitigating climate change impacts, including the diversity of the gut microbiome, and calls for more studies combining multiple anthropogenic stressors when predicting the persistence of species and communities through global changes.
Auteurs, date et publication :
Auteurs Emma Fromm , Lucie Zinger , Félix Pellerin , Lucie Di Gesu , Staffan Jacob , Laurane Winandy , Robin Aguilée , Nathalie Parthuisot , Amaia Iribar , Joël White , Elvire Bestion , Julien Cote
Publication : Proceedings of the Royal Society B: Biological Sciences
Date : 2024
Volume : 291
Issue : 2021
Pages : 20240220
Catégorie(s)
#CNRS #Metatron terrestreRésumé
In subalpine grasslands of the central French Alps, cessation of traditional mowing promotes dominance of Patzkea paniculata (L.) G.H.Loos (Poaceae) tussocks, with high biomass but low fodder quality. Mowing limits P. paniculata abundance through the depletion of its water-soluble carbohydrate (WSC) reserves, which sustain early spring growth initiation. However, the effectiveness of mowing effects is modulated by grassland functional composition, fertilization and climate change, as WSC compounds, and notably fructans, support plant physiological responses to climate stresses such as drought or frost.
Auteurs, date et publication :
Auteurs L. Bernard , M.‐L. Decau , A. Morvan‐Bertrand , S. Lavorel , J.‐C. Clément , F. Loreto
Publication : Plant Biology
Date : 2020
Pages : plb.13081