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Start Over Descriptor "OBSTACLE A LA MIGRATION" Topic 01 natural sciences
2 results on '"OBSTACLE A LA MIGRATION"'

1. Silver eel downstream migration in fragmented rivers: use of a Bayesian model to track movements triggering and duration

Author

Hilaire Drouineau, Alain Alric, Peggy Gomes, Pierre Sagnes, Frederique Bau, Nicolas Deligne, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Pôle Écohydraulique ONEMA-Irstea-INP, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut national de Recherche en Sciences et Technologies pour l'Environnement et l'Agriculture - IRSTEA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
0106 biological sciences, MIGRATION, Biodiversité et Ecologie, Silver eel, Ingénierie de l'environnement, Aquatic Science, Track (rail transport), 010603 evolutionary biology, 01 natural sciences, Movement ecology, Downstream (manufacturing), STATISTIQUE BAYESIENNE, Hydroelectricity, 14. Life underwater, Escapement, Hydropower, bayesian statistics, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Fish migration, biology, Anguilla anguilla, Discharge, Ecology, business.industry, 010604 marine biology & hydrobiology, Dynamique des Fluides, State-space model, ANGUILLA ANGUILLA, biology.organism_classification, Fishery, OBSTACLE A LA MIGRATION, River fragmentation, Environmental science, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, business, Migration delay
Abstract

International audience; Obstacles in rivers are considered to be one of the main threats to diadromous fish. As a result of the recent collapse of the European eel, the European Commission introduced a Regulation, requiring to reduce all sources of anthropogenic mortality, including those caused by passing through hydropower turbines. Improving knowledge about migration triggers and processes is crucial to assess and mitigate the impact of obstacles. In our study, we tracked 97 tagged silver eels in a fragmented river situated in the Western France (the River Dronne). Using the movement ecology framework, and implementing a Bayesian state-space model, we confirmed the influence of river discharge on migration triggering and the distance travelled by fish. We also demonstrated that, in our studied area, there is a small window of opportunity for migration. Moreover, we found that obstacles have a significant impact on distance travelled. Combined with the small window, this suggests that assessment of obstacles impact on downstream migration should not be limited to quantifying mortality at hydroelectric facilities, but should also consider the delay induced by obstacles, and its effects on escapement. The study also suggests that temporary turbines shutdown may mitigate the impacts of hydropower facilities in rivers with migration process similar to those observed here.

Published
2017
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2. To boldly climb: behavioural and cognitive differences in migrating European glass eels

Author

Fabien Pierron, Françoise Daverat, Simon Blanchet, T. Podgorniak, E. de Oliveira, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Station d'écologie théorique et expérimentale (SETE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Simulation et Traitement de l'information pour l'Exploitation des systèmes de Production (EDF R&D STEP), EDF R&D (EDF R&D), EDF (EDF)-EDF (EDF), Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Station d’Ecologie Expérimentale du CNRS à Moulis (SEEM), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE)

Subjects
cognition, 0106 biological sciences, 0301 basic medicine, Operations research, brain, eel, Population, Biology, 01 natural sciences, Environmental stress, 03 medical and health sciences, BARRAGE, [SDV.BA.ZV]Life Sciences [q-bio]/Animal biology/Vertebrate Zoology, 14. Life underwater, lcsh:Science, education, DAMS, education.field_of_study, Fish migration, Multidisciplinary, Habitat fragmentation, 010604 marine biology & hydrobiology, Biology (Whole Organism), COMPORTEMENT ANIMAL, Cognition, ANGUILLA ANGUILLA, ANIMAL BEHAVIOUR, behaviour, Exploratory behaviour, Fishery, POPULATION DYNAMICS, OBSTACLE A LA MIGRATION, 030104 developmental biology, Climbing, DYNAMIQUE DE POPULATION, lcsh:Q, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, human activities, Research Article
Abstract

European eel ( Anguilla anguilla ) is a catadromous fish species that received substantial attention as its population has markedly declined in the last three decades. The possible causes of this decline include habitat fragmentation factors such as dams and weirs. In some cases, these obstacles are equipped with fish friendly passage devices that may select young eels according to their climbing behaviour. We tested how individual climbing tendency was related to the event of fishway passage experienced in the field and classified fish climbing profiles as climbing ‘leaders’, ‘followers’, ‘finishers’ and ‘no climbers’. Moreover, we analysed the brain transcription level of genes related to neurogenesis and synaptic plasticity and compared it to climbing profiles. We found that fish from the upstream segments of an impounded river had a higher climbing propensity. Their behaviour was also more repeatable throughout the whole test than the obstacle-naive fish from the downstream segment. Moreover, we found that boldly climbing ‘leaders’ had lower levels of transcription of synapse-related genes than the climbing ‘followers’. These differences could be related to coping styles of fish, where proactive ‘leaders’ express a routine and risky behaviour, whereas reactive fish need an environmental assessment before exploratory behaviour. Our study showed that differences in climbing propensity exist in glass eels separated by water obstacles. Moreover, eels could adopt climbing different strategies according to the way they deal with environmental stress and to the cognitive abilities they possess.

Published
2016
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