13 results on '"Colin Vullioud"'
Search Results
2. Epigenetic signatures of social status in wild female spotted hyenas (Crocuta crocuta)
- Author
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Colin Vullioud, Sarah Benhaiem, Dorina Meneghini, Moshe Szyf, Yong Shao, Heribert Hofer, Marion L. East, Jörns Fickel, and Alexandra Weyrich
- Subjects
Biology (General) ,QH301-705.5 - Abstract
Abstract In mammalian societies, dominance hierarchies translate into inequalities in health, reproductive performance and survival. DNA methylation is thought to mediate the effects of social status on gene expression and phenotypic outcomes, yet a study of social status-specific DNA methylation profiles in different age classes in a wild social mammal is missing. We tested for social status signatures in DNA methylation profiles in wild female spotted hyenas (Crocuta crocuta), cubs and adults, using non-invasively collected gut epithelium samples. In spotted hyena clans, female social status influences access to resources, foraging behavior, health, reproductive performance and survival. We identified 149 differentially methylated regions between 42 high- and low-ranking female spotted hyenas (cubs and adults). Differentially methylated genes were associated with energy conversion, immune function, glutamate receptor signalling and ion transport. Our results provide evidence that socio-environmental inequalities are reflected at the molecular level in cubs and adults in a wild social mammal.
- Published
- 2024
- Full Text
- View/download PDF
3. Mothers with higher twinning propensity had lower fertility in pre-industrial Europe
- Author
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Ian J. Rickard, Colin Vullioud, François Rousset, Erik Postma, Samuli Helle, Virpi Lummaa, Ritva Kylli, Jenni E. Pettay, Eivin Røskaft, Gine R. Skjærvø, Charlotte Störmer, Eckart Voland, Dominique Waldvogel, and Alexandre Courtiol
- Subjects
Science - Abstract
Abstract Historically, mothers producing twins gave birth, on average, more often than non-twinners. This observation has been interpreted as twinners having higher intrinsic fertility – a tendency to conceive easily irrespective of age and other factors – which has shaped both hypotheses about why twinning persists and varies across populations, and the design of medical studies on female fertility. Here we show in >20k pre-industrial European mothers that this interpretation results from an ecological fallacy: twinners had more births not due to higher intrinsic fertility, but because mothers that gave birth more accumulated more opportunities to produce twins. Controlling for variation in the exposure to the risk of twinning reveals that mothers with higher twinning propensity – a physiological predisposition to producing twins – had fewer births, and when twin mortality was high, fewer offspring reaching adulthood. Twinning rates may thus be driven by variation in its mortality costs, rather than variation in intrinsic fertility.
- Published
- 2022
- Full Text
- View/download PDF
4. Assigning metabolic rate measurements to torpor and euthermy in heterothermic endotherms: ‘torpor’, a new package for R
- Author
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Nicolas J. Fasel, Colin Vullioud, and Michel Genoud
- Subjects
energetics ,metabolism ,bayesian ,mixture models ,energy saving ,Science ,Biology (General) ,QH301-705.5 - Abstract
Torpor is a state of controlled reduction of metabolic rate (M) in endotherms. Assigning measurements of M to torpor or euthermy can be challenging, especially when the difference between euthermic M and torpid M is small, in species defending a high minimal body temperature in torpor, in thermolabile species, and slightly below the thermoneutral zone (TNZ). Here, we propose a novel method for distinguishing torpor from euthermy. We use the variation in M measured during euthermic rest and torpor at varying ambient temperatures (Ta) to objectively estimate the lower critical temperature (Tlc) of the TNZ and to assign measurements to torpor, euthermic rest or rest within TNZ. In addition, this method allows the prediction of M during euthermic rest and torpor at varying Ta, including resting M within the TNZ. The present method has shown highly satisfactory results using 28 published sets of metabolic data obtained by respirometry on 26 species of mammals. Ultimately, this novel method aims to facilitate analysis of respirometry data in heterothermic endotherms. Finally, the development of the associated R-package (torpor) will enable widespread use of the method amongst biologists.
- Published
- 2022
- Full Text
- View/download PDF
5. Author Correction: Mothers with higher twinning propensity had lower fertility in pre-industrial Europe
- Author
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Ian J. Rickard, Colin Vullioud, François Rousset, Erik Postma, Samuli Helle, Virpi Lummaa, Ritva Kylli, Jenni E. Pettay, Eivin Røskaft, Gine R. Skjærvø, Charlotte Störmer, Eckart Voland, Dominique Waldvogel, and Alexandre Courtiol
- Subjects
Science - Published
- 2022
- Full Text
- View/download PDF
6. Recovery of influenza A viruses from lake water and sediments by experimental inoculation.
- Author
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Daniela Numberger, Carola Dreier, Colin Vullioud, Gülsah Gabriel, Alex D Greenwood, and Hans-Peter Grossart
- Subjects
Medicine ,Science - Abstract
Influenza A viruses (IAV) are zoonotic pathogens relevant to human, domestic animal and wildlife health. Many avian IAVs are transmitted among waterfowl via a faecal-oral-route. Therefore, environmental water where waterfowl congregate may play an important role in the ecology and epidemiology of avian IAV. Water and sediment may sustain and transmit virus among individuals or species. It is unclear at what concentrations waterborne viruses are infectious or remain detectable. To address this, we performed lake water and sediment dilution experiments with varying concentrations or infectious doses of four IAV strains from seal, turkey, duck and gull. To test for infectivity of the IAV strains in a concentration dependent manner, we applied cultivation to specific pathogen free (SPF) embryonated chicken eggs and Madin-Darby Canine Kidney (MDCK) cells. IAV recovery was more effective from embryonated chicken eggs than MDCK cells for freshwater lake dilutions, whereas, MDCK cells were more effective for viral recovery from sediment samples. Low infectious dose (1 PFU/200 μL) was sufficient in most cases to detect and recover IAV from lake water dilutions. Sediment required higher initial infectious doses (≥ 100 PFU/200 μL).
- Published
- 2019
- Full Text
- View/download PDF
7. Correction: Recovery of influenza A viruses from lake water and sediments by experimental inoculation.
- Author
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Daniela Numberger, Carola Dreier, Colin Vullioud, Gülsah Gabriel, Alex D Greenwood, and Hans-Peter Grossart
- Subjects
Medicine ,Science - Abstract
[This corrects the article DOI: 10.1371/journal.pone.0216880.].
- Published
- 2019
- Full Text
- View/download PDF
8. Assigning metabolic rate measurements to torpor and euthermy in heterothermic endotherms: 'torpor', a new package for R
- Author
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Nicolas J, Fasel, Colin, Vullioud, and Michel, Genoud
- Subjects
Mammals ,Rest ,Torpor ,Animals ,Energy Metabolism ,Body Temperature Regulation - Abstract
Torpor is a state of controlled reduction of metabolic rate (M) in endotherms. Assigning measurements of M to torpor or euthermy can be challenging, especially when the difference between euthermic M and torpid M is small, in species defending a high minimal body temperature in torpor, in thermolabile species, and slightly below the thermoneutral zone (TNZ). Here, we propose a novel method for distinguishing torpor from euthermy. We use the variation in M measured during euthermic rest and torpor at varying ambient temperatures (Ta) to objectively estimate the lower critical temperature (Tlc) of the TNZ and to assign measurements to torpor, euthermic rest or rest within TNZ. In addition, this method allows the prediction of M during euthermic rest and torpor at varying Ta, including resting M within the TNZ. The present method has shown highly satisfactory results using 28 published sets of metabolic data obtained by respirometry on 26 species of mammals. Ultimately, this novel method aims to facilitate analysis of respirometry data in heterothermic endotherms. Finally, the development of the associated R-package (torpor) will enable widespread use of the method amongst biologists.
- Published
- 2021
9. Mothers with higher twinning propensity had lower fertility in pre-industrial Europe
- Author
-
Ian J. Rickard, Colin Vullioud, François Rousset, Erik Postma, Samuli Helle, Virpi Lummaa, Ritva Kylli, Jenni E. Pettay, Eivin Røskaft, Gine R. Skjærvø, Charlotte Störmer, Eckart Voland, Dominique Waldvogel, Alexandre Courtiol, Department of Anthropology [Durham University], Durham University, Leibniz Institute for Zoo and Wildlife Research (IZW), Leibniz Association, Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), University of Exeter, University of Turku, Université d'Oulu, Trondheim University, Justus-Liebig-Universität Gießen = Justus Liebig University (JLU), and Universität Zürich [Zürich] = University of Zurich (UZH)
- Subjects
Adult ,Female [MeSH] ,General Chemistry ,Adult [MeSH] ,Multidisciplinary ,Humans [MeSH] ,Parturition [MeSH] ,Behavioural ecology ,Fertility [MeSH] ,Twins [MeSH] ,Middle Aged [MeSH] ,General Biochemistry, Genetics and Molecular Biology ,Europe/epidemiology [MeSH] ,Maternal Age [MeSH] ,Human behaviour ,Biological anthropology ,Young Adult [MeSH] ,Mothers [MeSH] ,Statistical methods ,Pregnancy [MeSH] ,General Physics and Astronomy ,[SHS.ANTHRO-BIO]Humanities and Social Sciences/Biological anthropology ,Parturition ,Twins ,Mothers ,[SHS.DEMO]Humanities and Social Sciences/Demography ,Middle Aged ,Europe ,Young Adult ,Fertility ,Pregnancy ,Humans ,Female ,Maternal Age - Abstract
Historically, mothers producing twins gave birth, on average, more often than non-twinners. This observation has been interpreted as twinners having higher intrinsic fertility – a tendency to conceive easily irrespective of age and other factors – which has shaped both hypotheses about why twinning persists and varies across populations, and the design of medical studies on female fertility. Here we show in >20k pre-industrial European mothers that this interpretation results from an ecological fallacy: twinners had more births not due to higher intrinsic fertility, but because mothers that gave birth more accumulated more opportunities to produce twins. Controlling for variation in the exposure to the risk of twinning reveals that mothers with higher twinning propensity – a physiological predisposition to producing twins – had fewer births, and when twin mortality was high, fewer offspring reaching adulthood. Twinning rates may thus be driven by variation in its mortality costs, rather than variation in intrinsic fertility.
- Published
- 2021
10. Confidence as an expression of commitment: why misplaced expressions of confidence backfire
- Author
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Colin Vullioud, Thomas C. Scott-Phillips, Hugo Mercier, Fabrice Clément, Université de Neuchâtel (UNINE), Centre de Sciences Cognitives, Department of Anthropology [Durham University], Durham University, Institut Jean-Nicod (IJN), Département d'Etudes Cognitives - ENS Paris (DEC), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École des hautes études en sciences sociales (EHESS)-Collège de France (CdF (institution))-Centre National de la Recherche Scientifique (CNRS)-Département de Philosophie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Université Paris sciences et lettres (PSL), École des hautes études en sciences sociales (EHESS), and Centre National de la Recherche Scientifique (CNRS)
- Subjects
ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,05 social sciences ,050109 social psychology ,Experimental and Cognitive Psychology ,Data_CODINGANDINFORMATIONTHEORY ,Commit ,[SHS.ANTHRO-SE]Humanities and Social Sciences/Social Anthropology and ethnology ,050105 experimental psychology ,Expression (mathematics) ,[SCCO]Cognitive science ,[SHS.EVOLUTION]Humanities and Social Sciences/domain_shs.evolution ,Arts and Humanities (miscellaneous) ,0501 psychology and cognitive sciences ,Communication source ,Psychology ,Social psychology ,Competence (human resources) ,Ecology, Evolution, Behavior and Systematics ,Overconfidence effect - Abstract
International audience; Because communication can be abused by senders, it is not inherently stable. One way of stabilizing communication is for senders to commit to their messages. If a sender is committed to a message, she is willing to incur a cost (direct or reputational) if the message is found to be unreliable. This cost provides a reason for receivers to accept messages to which senders are committed. We suggest that expressions of confidence can be used as commitment signals: messages expressed more confidently commit their senders more. On this basis, we make three predictions: that confidently expressed messages are more persuasive (H1’, already well established), that senders whose messages were accepted due to the senders' confidence but were then found to be unreliable should incur costs (H2’), and that if a message is accepted for reasons other than confidence, when it is found to be unreliable the sender should incur lower reputational costs than if the message had been accepted on the basis of the sender's confidence (H3’). A review of the literature revealed broadly supportive but still ambiguous evidence for H2’ and no tests of H3’. In Experiments 1, 2, and 3 (testing H2’) participants received the same advice from two senders, one being confident and the other unconfident. Participants were more likely to follow the advice of the confident sender, but once the advice was revealed to have been misguided, participants adjusted their trust so that they trusted the initially unconfident sender more than the confident sender. In Experiments 3 and 4 (testing H3’) participants chose between either two senders differing in confidence or two senders differing in competence. Participants followed the advice of the confident sender and of the competent sender. When it was revealed that the advice was misguided, the confident sender suffered from a larger drop in trust than the competent sender. These results are relevant for communicative theories of overconfidence.
- Published
- 2017
11. Recovery of influenza a viruses from lake water and sediments by experimental inoculation
- Author
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Colin Vullioud, Alex D. Greenwood, Daniela Numberger, Guelsah Gabriel, Carole Dreier, and Hans-Peter Grossart
- Subjects
RNA viruses ,Viral Diseases ,Serial dilution ,Marine and Aquatic Sciences ,Fresh Water ,medicine.disease_cause ,Poultry ,0403 veterinary science ,Animal Cells ,Red Blood Cells ,Medicine and Health Sciences ,Influenza A virus ,Gamefowl ,Pathology and laboratory medicine ,Specific-pathogen-free ,Sedimentary Geology ,Infectivity ,0303 health sciences ,Multidisciplinary ,Infectious dose ,Eukaryota ,Geology ,04 agricultural and veterinary sciences ,Medical microbiology ,Infectious Diseases ,Viruses ,Vertebrates ,Medicine ,Pathogens ,Cellular Types ,Research Article ,Freshwater Environments ,040301 veterinary sciences ,Science ,Biology ,Hemagglutination ,Sediment ,Chickens ,Influenza ,Surface water ,Fresh water ,Lakes ,Microbiology ,Virus ,Birds ,03 medical and health sciences ,Surface Water ,ddc:570 ,medicine ,Influenza viruses ,Animals ,Institut für Biochemie und Biologie ,Petrology ,Blood Cells ,Biology and life sciences ,030306 microbiology ,Ecology and Environmental Sciences ,Organisms ,Viral pathogens ,Embryonated ,Aquatic Environments ,Aquatic animal ,Cell Biology ,Bodies of Water ,Microbial pathogens ,Fowl ,Amniotes ,Earth Sciences ,Hydrology ,Orthomyxoviruses - Abstract
Influenza A viruses (IAV) are zoonotic pathogens relevant to human, domestic animal and wildlife health. Many avian IAVs are transmitted among waterfowl via a faecal-oral-route. Therefore, environmental water where waterfowl congregate may play an important role in the ecology and epidemiology of avian IAV. Water and sediment may sustain and transmit virus among individuals or species. It is unclear at what concentrations waterborne viruses are infectious or remain detectable. To address this, we performed lake water and sediment dilution experiments with varying concentrations or infectious doses of four IAV strains from seal, turkey, duck and gull. To test for infectivity of the IAV strains in a concentration dependent manner, we applied cultivation to specific pathogen free (SPF) embryonated chicken eggs and Madin-Darby Canine Kidney (MDCK) cells. IAV recovery was more effective from embryonated chicken eggs than MDCK cells for freshwater lake dilutions, whereas, MDCK cells were more effective for viral recovery from sediment samples. Low infectious dose (1 PFU/200 mu L) was sufficient in most cases to detect and recover IAV from lake water dilutions. Sediment required higher initial infectious doses (>= 100 PFU/200 mu L).
- Published
- 2019
12. Social support drives female dominance in the spotted hyaena
- Author
-
Alexandre Courtiol, Oliver P. Höner, Bettina Wachter, Eve Davidian, François Rousset, Colin Vullioud, Leibniz Institute for Zoo and Wildlife Research (IZW), Leibniz Association, Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226
- Subjects
0106 biological sciences ,Male ,Behavioural ecology ,Biology ,Crocuta crocuta ,Evolutionary ecology ,010603 evolutionary biology ,01 natural sciences ,Social group ,Sexual conflict ,03 medical and health sciences ,5. Gender equality ,Animals ,10. No inequality ,Social Behavior ,Ecology, Evolution, Behavior and Systematics ,030304 developmental biology ,0303 health sciences ,Sex Characteristics ,Ecology ,Female dominance ,Behavior, Animal ,Evolutionary theory ,biology.organism_classification ,Sexual dimorphism ,Dominance (ethology) ,Sexual selection ,Female ,Hyaenidae ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,Demography ,Sex characteristics - Abstract
International audience; Identifying how dominance within and between the sexes is established is pivotal to understanding sexual selection and sexual conflict. In many species, members of one sex dominate those of the other in one-on-one interactions. Whether this results from a disparity in intrinsic attributes, such as strength and aggressiveness, or in extrinsic factors, such as social support, is currently unknown. We assessed the effects of both mechanisms on dominance in the spotted hyaena (Crocuta crocuta), a species where sexual size dimorphism is low and females often dominate males. We found that individuals with greater potential social support dominated one-on-one interactions in all social contexts, irrespective of their body mass and sex. Female dominance emerged from a disparity in social support in favour of females. This disparity was a direct consequence of male-biased dispersal and the disruptive effect of dispersal on social bonds. Accordingly, the degree of female dominance varied with the demographic and kin structure of the social groups, ranging from male and female co-dominance to complete female dominance. Our study shows that social support can drive sex-biased dominance and provides empirical evidence that a sex-role-defining trait can emerge without the direct effect of sex.
- Published
- 2019
13. Correction: Recovery of influenza A viruses from lake water and sediments by experimental inoculation
- Author
-
Colin Vullioud, Hans-Peter Grossart, Alex D. Greenwood, Carola Dreier, Gülsah Gabriel, and Daniela Numberger
- Subjects
Veterinary medicine ,Geologic Sediments ,Multidisciplinary ,Microbial Viability ,Inoculation ,lcsh:R ,lcsh:Medicine ,Correction ,Water ,Influenza a ,Chick Embryo ,Biology ,Lake water ,Madin Darby Canine Kidney Cells ,Lakes ,Dogs ,Influenza A virus ,Animals ,lcsh:Q ,lcsh:Science ,Water Microbiology - Abstract
Influenza A viruses (IAV) are zoonotic pathogens relevant to human, domestic animal and wildlife health. Many avian IAVs are transmitted among waterfowl via a faecal-oral-route. Therefore, environmental water where waterfowl congregate may play an important role in the ecology and epidemiology of avian IAV. Water and sediment may sustain and transmit virus among individuals or species. It is unclear at what concentrations waterborne viruses are infectious or remain detectable. To address this, we performed lake water and sediment dilution experiments with varying concentrations or infectious doses of four IAV strains from seal, turkey, duck and gull. To test for infectivity of the IAV strains in a concentration dependent manner, we applied cultivation to specific pathogen free (SPF) embryonated chicken eggs and Madin-Darby Canine Kidney (MDCK) cells. IAV recovery was more effective from embryonated chicken eggs than MDCK cells for freshwater lake dilutions, whereas, MDCK cells were more effective for viral recovery from sediment samples. Low infectious dose (1 PFU/200 μL) was sufficient in most cases to detect and recover IAV from lake water dilutions. Sediment required higher initial infectious doses (≥ 100 PFU/200 μL).
- Published
- 2019
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