Auteurs, date et publication :
Auteurs Eric Edeline , Gérard Lacroix , Christine Delire , Nicolas Poulet , Stéphane Legendre
Publication : Global Change Biology
Date : 2025
Volume : 19
Issue : 10
Pages : 3062-3068
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Alexia Stokes , Sébastien Barot , Jean-Christophe Lata , Gérard Lacroix , Clive G. Jones , William J. Mitsch
Publication : Ecological Engineering
Date : 2025
Volume : 45
Pages : 1-4
Catégorie(s)
#CNRS #Ecotron IleDeFrance #ENS #PLANAQUARésumé
Although parasite infection and pollution are common threats facing wild populations, the response of the gut microbiota to the joint impact of these stressors remains largely understudied. Here, we experimentally investigated the effects of exposure to Polycyclic Aromatic Hydrocarbons (PAHs) and infection by a common acanthocephalan intestinal parasite (Pomphorhynchus sp.) on the gut microbial flora of a freshwater fish, the European chub (Squalius cephalus). Naturally infected or uninfected individuals were exposed to PAHs at environmentally realistic concentrations over a five-week period. Characterization of the gut bacterial community through 16S rRNA gene amplicon sequencing revealed that parasitic infection was a more structuring factor of bacterial diversity and composition than PAH exposure. Specifically, chub infected by Pomphorhynchus sp. harbored significantly less evenly represented gut bacterial communities than the uninfected ones. In addition, substantial changes in sequence abundance were observed within the main bacterial phyla, including the Firmicutes, Fusobacteriota, Actinobacteriota, and Proteobacteria. Again, these compositional changes correlated with host infection with Pomphorhynchus sp., confirming its pivotal role in gut microbial assemblage. Overall, these results highlight the importance of defining the parasitic status of individuals when conducting microbial ecotoxicological analyses at the digestive tract level, as this should lead to better understanding of microbiota modulations and help to identify microbial markers specifically associated with chemicals.
Auteurs, date et publication :
Auteurs Yannick Colin , Noëlie Molbert , Thierry Berthe , Simon Agostini , Fabrice Alliot , Beatriz Decencière , Alexis Millot , Aurélie Goutte , Fabienne Petit
Publication : Scientific Reports
Date : 2022
Volume : 12
Issue : 1
Pages : 11084
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs L. Jacquin , Q. Mori , V. MéDoc
Publication : Parasitology
Date : 2025
Volume : 140
Issue : 10
Pages : 1310-1315
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Florence D. Hulot , Gérard Lacroix , Michel Loreau
Publication : Oikos
Date : 2025
Volume : 123
Issue : 11
Pages : 1291-1300
Catégorie(s)
#CNRS #ENS #PLANAQUAAuteurs, date et publication :
Auteurs Jean-François Humbert , Kamel Soudani , Gabriel Hmimina , Louise Audebert , Stéphane Buttigieg , Patrice Chatellier , Simon Chollet , Beatriz Decencière , François Derkx , Catherine Freissinet , others
Date : 2025
Catégorie(s)
#CNRS #Ecotron IleDeFrance #ENS #PLANAQUAAuteurs, 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 #PLANAQUARésumé
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 Meryem Mojtahid , Pauline Depuydt , Aurélia Mouret , Fatine Rihani , Sandrine Le Houedec , Sarah Fiorini , Simon Chollet , Florent Massol , Francis Dohou , Helena L. Filipsson , Wim Boer , Gert-Jan Reichart , Sophie Quinchard , Carole La , Christine Barras
Date : 2022