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| Registros recuperados: 11 | |
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| Geoffroy, Benjamain; Alfonso, Sebastien; Sadoul, Bastien; Blumstein, Daniel T. |
| Humans currently occupy all continents and by doing so, modify the environment and create novel threats to many species; a phenomenon known as human-induced rapid environmental changes (HIREC). These growing anthropogenic disturbances represent major and relatively new environmental challenges for many animals, and invariably alter selection on traits adapted to previous environments. Those species that survive often have moved from their original habitat or modified their phenotype through plasticity or genetic evolution. Based on the most recent advances in this research area, we predict that wild individuals with highly plastic capacities, relatively high basal stress level, and that are generally shy—in other words, individuals displaying a reactive... |
| Tipo: Text |
Palavras-chave: Coping style; Antipredator behavior; Evolution; Stress physiology; Ecology; Predation; Urbanization; Pollution. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00664/77564/79528.pdf |
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| Alfonso, Sebastien; Sadoul, Bastien; Gesto, Manuel; Joassard, Lucette; Chatain, Beatrice; Geffroy, Benjamin; Bégout, Marie-laure. |
| Coping styles consist of a coherent set of individual physiological and behavioral differences in stress responses that are consistent across time and context. Such consistent inter-individual differences in behavior have already been shown in European sea bass (Dicentrarchus labrax), but the associated mechanisms are still poorly understood. Here, we combine physiological measurements with individual behavioral responses in order to characterize coping styles in fish. Fish were tagged and placed in a tank for group risk-taking tests (GRT) at 8 months of age to evaluate boldness using the proxy latency of leaving a sheltered area towards an open area. A subsample of these fish were individually challenged 16 months later using an open field test (OFT), in... |
| Tipo: Text |
Palavras-chave: Personality; HPI axis; Gene transcription; Neurotransmitters. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00491/60282/63708.pdf |
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| Sadoul, Bastien; Alfonso, Sebastien; Bessa, E.; Bouchareb, A.; Blondeau-bidet, E.; Clair, P.; Chatain, Beatrice; Begout, Marie-laure; Geffroy, Benjamin. |
| Stress enhances or inhibits neurogenesis in mammals and some fish species. The link between the two processes is still unclear. Most studies have been performed in very specific stressful or altered environments. Despite the known inter-individual divergence in coping abilities within populations, the relationship between the stress axis and neurogenesis has never been addressed in unstressed individuals. Here we correlate brain expression of the pcna (proliferating cell nuclear antigen) and neurod1 (neurogenic differentiation factor 1) genes, two markers of neurogenesis, with transcripts of cortisol receptors in three fish species living in very distinct environments. Within the three species, individuals with the highest expression of neurogenesis genes... |
| Tipo: Text |
Palavras-chave: Neurogenesis; Stress; Glucocorticoid receptor; Mineralocorticoid receptor; Hypothalamo-pituitary-interrenal axis. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00444/55560/57164.pdf |
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| Geffroy, Benjamin; Sadoul, Bastien; Putman, Breanna J.; Berger-tal, Oded; Garamszegi, László Zsolt; Møller, Anders Pape; Blumstein, Daniel T.; De Waal, Frans B. M.. |
| Humans profoundly impact landscapes, ecosystems, and animal behavior. In many cases, animals living near humans become tolerant of them and reduce antipredator responses. Yet, we still lack an understanding of the underlying evolutionary dynamics behind these shifts in traits that affect animal survival. Here, we used a phylogenetic meta-analysis to determine how the mean and variability in antipredator responses change as a function of the number of generations spent in contact with humans under 3 different contexts: urbanization, captivity, and domestication. We found that any contact with humans leads to a rapid reduction in mean antipredator responses as expected. Notably, the variance among individuals over time observed a short-term increase followed... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00652/76397/77422.pdf |
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| Sadoul, Bastien; Blumstein, Daniel T.; Alfonso, Sebastien; Geffroy, Benjamin. |
| Wild animals face novel environmental threats from human activities that may occur along a gradient of interactions with humans. Recent work has shown that merely living close to humans has major implications for a variety of antipredator traits and physiological responses. Here, we hypothesize that when human presence protects prey from their genuine predators (as sometimes seen in urban areas and at some tourist sites), this predator shield, followed by a process of habituation to humans, decouples commonly associated traits related to coping styles, which results in a new range of phenotypes. Such individuals are characterized by low aggressiveness and physiological stress responses, but have enhanced behavioral plasticity, boldness, and cognitive... |
| Tipo: Text |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00688/80053/83056.pdf |
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| Vandeputte, Marc; Clota, Frederic; Sadoul, Bastien; Blanc, Marie-odile; Blondeau-bidet, Eva; Bégout, Marie-laure; Cousin, Xavier; Geffroy, Benjamin. |
| Temperature‐dependent sex determination (TSD) can be observed in multiple reptile and fish species. It is adaptive when varying environmental conditions advantage either males or females. A good knowledge of the thermosensitive period is key to understand how environmental changes may lead to changes in population sex ratio. Here, by manipulating temperature during development, we confirm that cold temperature (16°C) increases the proportion of fish that develop as females in European sea bass (Dicentrarchus labrax) until 56 days posthatching, but show that it has an opposite effect at later stages, with the proportion of males reaching ~90% after 230 days at 16°C. This is the first observation of opposite effects of temperature at different time periods... |
| Tipo: Text |
Palavras-chave: Dicentrarchus labrax; Fish; Sex ratio; Temperature-dependent sex determination; Thermosensitive period; TSD. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00658/76965/78184.pdf |
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| Sadoul, Bastien; Geffroy, Benjamin. |
| Stress in teleosts is an increasingly studied topic because of its interaction with growth, reproduction, immune system and ultimately fitness of the animal. Whether it is for evaluating welfare in aquaculture, adaptive capacities in fish ecology, or to investigate effects of human‐induced rapid environmental change, new experimental methods to describe stress physiology in captive or wild fish have flourished. Cortisol has proven to be a reliable indicator of stress and is considered the major stress hormone. Initially principally measured in blood, cortisol measurement methods are now evolving towards lower invasiveness and to allow repeated measurements over time. We present an overview of recent achievements in the field of cortisol measurement in... |
| Tipo: Text |
Palavras-chave: Aquaculture; Cortisol; Glucocorticoids; Non-invasive; Stress; Welfare. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00478/59001/61616.pdf |
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| Geffroy, Benjamin; Sadoul, Bastien; Bouchareb, Amine; Prigent, Sylvain; Bourdineaud, Jean-paul; Gonzalez-rey, Maria; Morais, Rosana N.; Mela, Maritana; Carvalho, Lucelia Nobre; Bessa, Eduardo. |
| Nature-based tourism is gaining extensive popularity, increasing the intensity and frequency of human-wildlife contacts. As a consequence, behavioral and physiological alterations were observed in most exposed animals. However, while the majority of these studies investigated the effects of punctual exposure to tourists, the consequences of constant exposition to humans in the wild remains overlooked. This is an important gap considering the exponential interest for recreational outdoor activities. To infer long-term effects of intensive tourism, we capitalized on Odontostilbe pequira, a short-lived sedentary Tetra fish who spends its life close to humans, on which it feeds on dead skin. Hence, those fish are constantly exposed to tourists throughout their... |
| Tipo: Text |
Palavras-chave: Coping style; Ecotourism; Conservation; Behavior; Gene expression; Cortisol; Neurogenesis; Fish. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00423/53470/54366.pdf |
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| Sadoul, Bastien; Augustine, S.; Zimmer, E.; Begout, Marie-laure; Vijayan, M. M.. |
| Bisphenol A (BPA) in eggs prior to fertilization was found to induce long-term metabolic disturbances in juvenile rainbow trout (Oncorhynchus mykiss ). Here we describe these imprinting effects in a Dynamic Energy Budget (DEB) framework, which allows interpretation of the data in an energy allocation context. First, DEB parameters for control rainbow trout were optimized using data extracted from 12 studies in the literature. Several modes of action on DEB parameters were then tested in order to correctly predict weight differences observed in rainbow trout in response to 5 different concentrations of BPA in eggs prior to fertilization. Reduced energy conductance v̇ at day 0, followed by an exponential recovery, was found to closely fit the experimental... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00442/55359/56871.pdf |
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| Alfonso, Sebastien; Sadoul, Bastien; Cousin, Xavier; Bégout, Marie-laure. |
| In aquaculture, fish are exposed to unavoidable stressors that can be detrimental for their health and welfare. However, welfare in farmed fish can be difficult to assess, and, so far, no standardized test has been universally accepted as a welfare indicator. This work contributes to the establishment of behavioural welfare indicators in a marine teleost in response to different water quality acute stressors. Groups of ten fish were exposed to high Total Ammonia Nitrogen concentration (High TAN, 18 mg.L-1), Hyperoxia (200 % O2 saturation), Hypoxia (20 % O2 saturation), or control water quality (100% O2 saturation and TAN < 2.5 mg.L-1) over 1 hour. Fish were then transferred in a novel environment for a group behaviour test under the same water quality... |
| Tipo: Text |
Palavras-chave: Fish; Welfare; Water quality; Behaviour; Stress. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00612/72399/71344.pdf |
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| Registros recuperados: 11 | |
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