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Your search keyword '"Séverine Suchail"' showing total 2 results
Start Over Author "Séverine Suchail" Topic 030104 developmental biology
2 results on '"Séverine Suchail"'

1. Colony adaptive response to simulated heat waves and consequences at the individual level in honeybees (Apis mellifera)

Author

Didier Crauser, Michel Pélissier, Hélène Dechatre, Maryline Pioz, Samuel Soubeyrand, Yves Le Conte, Séverine Suchail, Célia Bordier, Cédric Alaux, Mathilde Peruzzi, Abeilles et Environnement (AE), Institut National de la Recherche Agronomique (INRA)-Avignon Université (AU), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), Biostatistique et Processus Spatiaux (BIOSP), Institut National de la Recherche Agronomique (INRA), ANR-13-ADAP-0002, Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Biostatistique et Processus Spatiaux (BioSP), and Bordier, Célia

Subjects
0106 biological sciences, 0301 basic medicine, Thermotolerance, Hot Temperature, Science, media_common.quotation_subject, [SDV]Life Sciences [q-bio], Foraging, Insect, flux de chaleur, food habits, 010603 evolutionary biology, 01 natural sciences, Article, 03 medical and health sciences, Extreme weather, colonie d'abeilles, apis mellifera, Pollinator, Deformed wing virus, Animals, thermorégulation, media_common, thermoregulation, Multidisciplinary, physiologie animale, biology, comportement alimentaire, Ecology, Simulation de Vagues de Chaleur (SHW), Adaptive response, Thermoregulation, Bees, biology.organism_classification, Brood, Oxidative Stress, 030104 developmental biology, 13. Climate action, Medicine
Abstract

Since climate change is expected to bring more severe and frequent extreme weather events such as heat waves, assessing the physiological and behavioural sensitivity of organisms to temperature becomes a priority. We therefore investigated the responses of honeybees, an important insect pollinator, to simulated heat waves (SHW). Honeybees are known to maintain strict brood thermoregulation, but the consequences at the colony and individual levels remain poorly understood. For the first time, we quantified and modelled colony real-time activity and found a 70% increase in foraging activity with SHW, which was likely due to the recruitment of previously inactive bees. Pollen and nectar foraging was not impacted, but an increase in water foragers was observed at the expense of empty bees. Contrary to individual energetic resources, vitellogenin levels increased with SHW, probably to protect bees against oxidative stress. Finally, though immune functions were not altered, we observed a significant decrease in deformed wing virus loads with SHW. In conclusion, we demonstrated that honeybees could remarkably adapt to heat waves without a cost at the individual level and on resource flow. However, the recruitment of backup foraging forces might be costly by lowering the colony buffering capacity against additional environmental pressures.

Published
2017
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2. Stress response in honeybees is associated with changes in task-related physiology and energetic metabolism

Author

Cédric Alaux, Jean-Marc Devaud, Maryline Pioz, Claude Collet, Yves Le Conte, Mercedes Charreton, Célia Bordier, Séverine Suchail, Abeilles et Environnement (AE), Institut National de la Recherche Agronomique (INRA)-Avignon Université (AU), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), Centre de Recherches sur la Cognition Animale (CRCA), Centre de Biologie Intégrative (CBI), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut des sciences du cerveau de Toulouse. (ISCT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées, ANR-13-ADAP-0002, Institut des sciences du cerveau de Toulouse. (ISCT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Centre de Recherches sur la Cognition Animale - UMR5169 (CRCA), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre de Biologie Intégrative (CBI), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT), and Avignon Université (AU)-Institut National de la Recherche Agronomique (INRA)

Subjects
0106 biological sciences, 0301 basic medicine, Physiology, Juvenile-hormone esterase, [SDV]Life Sciences [q-bio], Gene Expression, 01 natural sciences, heat stress, chemistry.chemical_compound, apis mellifera, homeostasis, perturbation du métabolisme, division du travail, biology, Glycogen, Energetic metabolism, Thermoregulation, Bees, Insect Proteins, France, stress thermique, immunodéficit, métabolisme énergétique, Division of labour, 03 medical and health sciences, Vitellogenin, Immune system, Stress, Physiological, réponse au stress, Animals, Adipokinetic hormone, Pesticides, pesticide, changement physiologique, homéostasie, Stressor, fungi, immune deficiency, Immune challenge, Brood, 010602 entomology, 030104 developmental biology, chemistry, 13. Climate action, Insect Science, biology.protein, Basal Metabolism, Carboxylic Ester Hydrolases
Abstract

In a rapidly changing environment, honeybee colonies are increasingly exposed to diverse sources of stress (e.g., new parasites, pesticides, climate warming), which represent a challenge to individual and social homeostasis. However, bee physiological responses to stress remain poorly understood. We therefore exposed bees specialised in different tasks (nurses, guards and foragers) to ancient (immune and heat stress) or historically more recent sources of stress (pesticides), and we determined changes in the expression of genes linked to behavioural maturation (vitellogenin – vg and juvenile hormone esterase – jhe) as well as in energetic metabolism (glycogen level, expression level of the receptor to the adipokinetic hormone – akhr, and endothermic performance). While acute exposure to sublethal doses of two pesticides did not affect vg and jhe expression, immune and heat challenges caused a decrease and increase in both genes, respectively, suggesting that bees had responded to ecologically relevant stressors. Since vg and jhe are expressed to a higher level in nurses than in foragers, it is reasonable to assume that an immune challenge stimulated behavioural maturation to decrease potential contamination risk and that a heat challenge promoted a nurse profile for brood thermoregulation. All behavioural castes responded in the same way. Though endothermic performances did not change upon stress exposure, the akhr level dropped in immune and heat-challenged individuals. Similarly, the abdomen glycogen level tended to decline in immune-challenged bees. Altogether, these results suggest that bee responses are stress specific and adaptive but that they tend to entail a reduction of energetic metabolism that needs to be studied on a longer timescale.

Published
2017
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