Auteurs, date et publication :
Auteurs Christian Pichot , Nicolas Beudez , Cécile Callou , André Chanzy , Alyssa Clavreul , Philippe Clastre , Benjamin Jaillet , François Lafolie , Jean-François Le Galliard , Chloé Martin , Florent Massol , Damien Maurice , Nicolas Moitrier , Ghislaine Monet , Hélène Raynal , Antoine Schellenberger , Rachid Yahiaoui
Date : 2022
Catégorie(s)
#CNRS #Ecotron IleDeFrance #ENSRésumé
Patterns of size variation in fish are supposed to be generated by growth differences, not by egg or hatchling size variation. However, annual killifish live in temporary ponds with a limited time period available for growth and reproduction. It has therefore been hypothesized that among annual killifish, hatchling size variation should be of large relative importance to generate adaptive adult size variation. Using growth curves of 203 individuals from 18 Austrolebias species raised in a common environment, we demonstrate that hatchling size variation indeed is a main determinant of adult size variation in annual killifish, in agreement with the time constraint hypothesis. Furthermore, we find an increased early growth rate in piscivorous species augmenting their difference in size from small congeneric species. This should be adaptive if size differences determine predation success. Environmental effects of spatial location of the population of origin on hatchling size and growth suggest that the time constraint might be weakened in populations occurring near the Atlantic coast. Our study reveals how extreme environments demand specific life history solutions to achieve adaptive size variation and that there might be scope for local adaptations in growth trajectories.
Auteurs, date et publication :
Auteurs Andrew Helmstetter , Tom JM Van Dooren
Publication : bioRxiv
Date : 2019
Pages : 2019.12.31.891648
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Thibaud Decaëns , Frédéric Bénéluz , Liliana Ballesteros-Mejia , Diego Bonilla , Rodolphe Rougerie
Publication : ZooKeys
Date : 2025
Volume : 1031
Pages : 183
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Alexandra Pardow , Michael Lakatos
Publication : Biotropica
Date : 2025
Volume : 45
Issue : 1
Pages : 27-36
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Abstract Cold-adapted species escape climate warming by latitudinal and/or altitudinal range shifts, and currently occur in Southern Europe in isolated mountain ranges within “sky islands”. Here, we studied the genetic structure of the Apollo butterfly in five such sky islands (above 1,000 m) in France, and infer its demographic history since the last interglacial, using single nucleotide polymorphisms (ddRADseq SNPs). The Auvergne and Alps populations show strong genetic differentiation but not alpine massifs, although separated by deep valleys. Combining three complementary demographic inference methods and species distribution models (SDMs) we show that the LIG period was highly unfavourable for Apollo that probably survived in small population in the highest summits of Auvergne. The population shifted downslope and expanded eastward between LIG and LGM throughout the large climatically suitable Rhône valley between the glaciated summits of Auvergne and Alps. The Auvergne and Alps populations started diverging before the LGM but remained largely connected till the mid-Holocene. Population decline in Auvergne was more gradual but started before ($sim$7 kya vs. 800 ya), and was much stronger with current population size ten times lower than in the Alps. In the Alps, the low genetic structure and limited evidence for isolation by distance suggest a nonequilibrium metapopulation functioning. The core Apollo population experienced cycles of contraction-expansion with climate fluctuations with largely interconnected populations overtime according to a “metapopulation-pulsar” functioning. This study demonstrates the power of combining demographic inferences and SDMs to determine past and future evolutionary trajectories of an endangered species at a regional scale.
Auteurs, date et publication :
Auteurs Caroline Kebaïli , Stéphanie Sherpa , Delphine Rioux , Laurence Després
Publication : Molecular Ecology
Date : 2025
Volume : 31
Issue : 2
Pages : 448–466
Catégorie(s)
#CNRS #eDNAAuteurs, date et publication :
Auteurs Blanka Vlasáková
Publication : Journal of Tropical Ecology
Date : 2025
Volume : 31
Issue : 1
Pages : 95-98
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Rapid life-history changes caused by size-selective harvesting are often interpreted as a response to direct harvest selection against a large body size. However, similar trait changes may result from a harvest-induced relaxation of natural selection for a large body size via density-dependent selection. Here, we show evidence of such density-dependent selection favouring large-bodied individuals at high population densities, in replicated pond populations of medaka fish. Harvesting, in contrast, selected medaka directly against large-bodied medaka and, in parallel, decreased medaka population densities. Five years of harvesting were enough for harvested and unharvested medaka populations to inherit the classically-predicted trait differences, whereby harvested medaka grew slower and matured earlier than unharvested medaka. We demonstrate that this life-history divergence was not driven by direct harvest selection for a smaller body size in harvested populations, but by density-dependent natural selection for a larger body size in unharvested populations.
Auteurs, date et publication :
Auteurs Alix Bouffet-Halle , Jacques Mériguet , David Carmignac , Simon Agostini , Alexis Millot , Samuel Perret , Eric Motard , Beatriz Decenciere , Eric Edeline
Publication : bioRxiv
Date : 2020
Pages : 561522
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Lívia R Pinheiro , Jean-Aimé Cerda , Marcelo Duarte
Publication : The Canadian Entomologist
Date : 2025
Volume : 148
Issue : 4
Pages : 396-415
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Thomas Bourguignon , Jan Šobotník , Robert Hanus , Jana Krasulová , Vladimír Vrkoslav , Josef Cvačka , Yves Roisin
Publication : Molecular phylogenetics and evolution
Date : 2025
Catégorie(s)
#CNRS #FORET NouraguesAuteurs, date et publication :
Auteurs Carlo L Seifert , Christian H Schulze , Tobias CT Dreschke , Heinrich Frötscher , Konrad Fiedler
Publication : Entomologia Experimentalis et Applicata
Date : 2025
Volume : 158
Issue : 1
Pages : 54-59