Auteurs, date et publication :
Auteurs François Feer
Publication : Revista de Biología Tropical
Date : 2025
Volume : 61
Issue : 2
Pages : 753-768
Catégorie(s)
#⛔ No DOI found #CNRS #FORET NouraguesRésumé
Functional variability (FV) of populations can be decomposed into three main features: the individual variability of multiple traits, the strength of correlations between those traits and the main direction of these correlations, the latter two being known as ‘phenotypic integration’. Evolutionary biology has long recognized that FV in natural populations is key to determining potential evolutionary responses, but this topic has been little studied in functional ecology. Here, we focus on the arctico-alpine perennial plant species Polygonum viviparum L.. We used a comprehensive sampling of seven functional traits in 29 wild populations covering the whole environmental niche of the species. The niche of the species was captured by a temperature gradient, which separated alpine stressful habitats from species-rich, competitive subalpine ones. We sought to assess the relative roles of abiotic stress and biotic interactions in shaping different aspects of functional variation within and among populations, that is, the multi-trait variability, the strength of correlations between traits and the main directions of functional trade-offs. Populations with the highest extent of functional variability were found in the warm end of the gradient, whereas populations exhibiting the strongest degree of phenotypic integration were located in sites with intermediate temperatures. This could reveal both the importance of environmental filtering and population demography in structuring FV. Interestingly, we found that the main axes of multivariate functional variation were radically different within and across population. Although the proximate causes of FV structure remain uncertain, our study presents a robust methodology for the quantitative study of functional variability in connection with species' niches. It also opens up new perspectives for the conceptual merging of intraspecific functional patterns with community ecology.
Auteurs, date et publication :
Auteurs Florian C. Boucher , Wilfried Thuiller , Cindy Arnoldi , Cécile H. Albert , Sébastien Lavergne
Publication : Functional Ecology
Date : 2025
Volume : 27
Issue : 2
Pages : 382-391
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Patrick Saccone , Samuel Morin , Florence Baptist , Jean-Marc Bonneville , Marie-Pascale Colace , Florent Domine , Mathieu Faure , Roberto Geremia , Jonathan Lochet , Franck Poly , Sandra Lavorel , Jean-Christophe Clément
Publication : Plant and Soil
Date : 2025
Volume : 363
Issue : 1-2
Pages : 215-229
Catégorie(s)
#CNRS #Lautaret #UGARésumé
Mountain grassland ecosystems are particularly vulnerable to direct climate impacts and to indirect climate change impacts through farmers’ management adaptation. We modelled expected spatio-temporal trajectories of land management of a mountain grassland landscape in the French Alps under a range of short-term climate and socio-economic scenarios which were constructed using an advanced participatory approach with a variety of stakeholders. First, regional experts from nature conservation and agricultural extension were involved in the co-development of detailed qualitative climate and socioeconomic scenarios, expressed as coherent storylines. Second, to map land management adaptation to these storylines, we used a role playing game whereby farmers were put in an imaginary future situation and asked to make decisions under scenario constraints. For each scenario, game outcomes were used to map future land management at parcels to landscape scales. Main adaptations were conversion from mowing to grazing and increasing manured area, with varying proportions and locations for these two types of changes differing across scenarios, though overall small. These results highlight the limited adaptability of current farmers given a strongly constraining natural and social context. Beyond research outputs, this framework generated interesting outcomes for stakeholders and raised their awareness about the socio-ecological system’s vulnerability to future changes.
Auteurs, date et publication :
Auteurs Pénélope Lamarque , Aloïs Artaux , Cécile Barnaud , Laurent Dobremez , Baptiste Nettier , Sandra Lavorel
Publication : Landscape and Urban Planning
Date : 2025
Volume : 119
Pages : 147-157
Catégorie(s)
#CNRS #Lautaret #UGAAuteurs, date et publication :
Auteurs Alexandra Rodriguez , Amandine Gasc , Sandrine Pavoine , Philippe Grandcolas , Philippe Gaucher , Jérôme Sueur
Publication : Ecological Informatics
Date : 2025
Volume : 21
Pages : 133-143
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Bibiana Rojas
Publication : Behavioral ecology and sociobiology
Date : 2025
Volume : 68
Issue : 4
Pages : 551-559
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Virginie Roy , Reginaldo Constantino , Vincent Chassany , Stephanie Giusti‐Miller , Michel Diouf , Philippe Mora , Myriam Harry
Publication : Molecular ecology
Date : 2025
Volume : 23
Issue : 4
Pages : 902-920
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Models of gross primary production (GPP) based on remote sensing measurements are currently parameterized with vegetation-specific parameter sets and therefore require accurate information on the distribution of vegetation to drive them. Can this parameterization scheme be replaced with a vegetation-invariant set of parameters that can maintain or increase model applicability by reducing errors introduced from the uncertainty of land cover classification? Based on the measurements of ecosystem carbon fluxes from 168 globally distributed sites in a range of vegetation types, we examined the predictive capacity of seven light use efficiency (LUE) models. Two model experiments were conducted: (i) a constant set of parameters for various vegetation types and (ii) vegetation-specific parameters. The results showed no significant differences in model performance in simulating GPP while using both set of parameters. These results indicate that a universal of set of parameters, which is independent of vegetation cover type and characteristics can be adopted in prevalent LUE models. Availability of this well tested and universal set of parameters would help to improve the accuracy and applicability of LUE models in various biomes and geographic regions.
Auteurs, date et publication :
Auteurs Wenping Yuan
Publication : Ecological Modelling
Date : 2025
Pages : 10
Catégorie(s)
#CNRS #FORET PuechabonRésumé
The rate of metabolic processes demanding energy in tree stems changes in relation with prevailing climatic conditions. Tree water availability can affect stem respiration through impacts on growth, phloem transport or maintenance of diverse cellular processes, but little is known on this topic. Here we monitored seasonal changes in stem CO2 efflux (Fs), radial growth, sap flow and non-structural carbohydrates in trees of Quercus ilex in a Mediterranean forest stand subjected since 2003 to either partial (33%) throughfall exclusion (E) or unchanged throughfall (C). Fs increased exponentially during the day by an effect of temperature, although sap flow attenuated the increase in Fs during the day time. Over the year, Fs also increased exponentially with increasing temperatures, but Fs computed at a standard temperature of 15 ◦C (Fs15) varied by almost 4-fold among dates. Fs15 was the highest after periods of stem growth and decreased as tree water availability decreased, similarly in C and E treatments. The decline in Fs15 was not linked to a depletion of soluble sugars, which increased when water stress was higher. The proportion of ecosystem respiration attributed to the stems was highest following stem growth (23.3%) and lowest during the peak of drought (6.5%). High within-year variability in Fs15 makes unadvisable to pool annual data of Fs vs. temperature to model Fs at short time scales (hours to months) in Mediterranean-type forest ecosystems. We demonstrate that water availability is an important factor governing stem CO2 efflux and suggest that trees in Mediterranean environments acclimate to seasonal drought by reducing stem respiration. Stem respiratory rates do not seem to change after a long-term increase in drought intensity, however.
Auteurs, date et publication :
Auteurs Jesús Rodríguez-Calcerrada
Publication : Agricultural and Forest Meteorology
Date : 2025
Pages : 12
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Adriano Cavalleri , Laurence A Mound
Publication : Zootaxa
Date : 2025
Volume : 3814
Issue : 4
Pages : 581-590