A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands
International audience Salmonids belong to a high trophic level and are thus considered as strictly carnivorous species, metabolically adapted for high catabolism of proteins and low utilisation of dietary carbohydrates. However they conserved a “mammalian-type” nutritional regulation of glucokinase...
Published in: | Science of The Total Environment |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.archives-ouvertes.fr/hal-01607554 https://doi.org/10.1016/j.scitotenv.2017.08.247 |
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ftunivnantes:oai:HAL:hal-01607554v1 2023-05-15T13:58:19+02:00 A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands Marandel, Lucie Gaudin, Philippe Gueraud, Francois Glise, Stéphane Herman, Alexandre Plagnes- Juan, Elisabeth Veron, Vincent Panserat, Stéphane Labonne, Jacques Nutrition, Métabolisme, Aquaculture (NuMéA) Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA) Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP) This work benefited from the financial support of the Fédération de recherche MIRA (Milieu et ressources aquatiques) on behalf of University of Pau and Pays de l'Adour. This study is part of SALMEVOL 1041 program, funded by the French Polar Institute Paul Emile Victor (IPEV). 2018 https://hal.archives-ouvertes.fr/hal-01607554 https://doi.org/10.1016/j.scitotenv.2017.08.247 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2017.08.247 hal-01607554 https://hal.archives-ouvertes.fr/hal-01607554 doi:10.1016/j.scitotenv.2017.08.247 PRODINRA: 405859 WOS: 000413313700028 http://creativecommons.org/licenses/by-sa/ CC-BY-SA ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://hal.archives-ouvertes.fr/hal-01607554 Science of the Total Environment, Elsevier, 2018, 612, pp.276-285. ⟨10.1016/j.scitotenv.2017.08.247⟩ gluconeogenesis environment glucose metabolism carbohydrate polar salmonids kerguelen islands glyconeogenesis glucokinase métabolisme du glucose environnement gluconeogénèse iles kerguelen salmonidae poisson sauvage [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA]Life Sciences [q-bio]/Animal biology info:eu-repo/semantics/article Journal articles 2018 ftunivnantes https://doi.org/10.1016/j.scitotenv.2017.08.247 2022-11-09T02:00:39Z International audience Salmonids belong to a high trophic level and are thus considered as strictly carnivorous species, metabolically adapted for high catabolism of proteins and low utilisation of dietary carbohydrates. However they conserved a “mammalian-type” nutritional regulation of glucokinase encoding gene and its enzymatic activity by dietary carbohydrates which remains puzzling regarding their dietary regime. The present study investigates the hypothesis that this conservation could be linked to a real consumption by trout of this nutrient in their natural habitat. To do so, brown trout were sampled in the sub-Antarctic Kerguelen Islands, a site presenting oligotrophic hydrosystems and no local freshwater fish fauna prior the introduction of salmonids fifty years ago. Qualitative and quantitative analysis of carbohydrate content within Kerguelen trout stomachs demonstrate that these animals are fed on food resources containing digestible carbohydrates. Additionally, glycaemia and more particularly gck mRNA level and gck enzymatic activity prove that Kerguelen trout digest and metabolise dietary carbohydrates. Physiological and molecular analyses performed in the present study thus strongly evidence for consumption of dietary carbohydrates by wild trout in natural environments. Investigating differences between Kerguelen individuals, we found that smaller individuals presented higher glycaemia, as well as higher carbohydrates contents in stomach. However no relationship between scaled mass index and any physiological indicator was found. Thus it appears that Kerguelen trout do not turn to carbohydrate diet because of a different condition index, or that the consumption of carbohydrates does not lead to a generally degraded physiological status. As a conclusion, our findings may explain the evolutionary conservation of a “mammalian-type” nutritional regulation of gck by dietary carbohydrates in these carnivorous fish Article in Journal/Newspaper Antarc* Antarctic Kerguelen Islands Université de Nantes: HAL-UNIV-NANTES Antarctic Kerguelen Kerguelen Islands Science of The Total Environment 612 276 285 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
gluconeogenesis environment glucose metabolism carbohydrate polar salmonids kerguelen islands glyconeogenesis glucokinase métabolisme du glucose environnement gluconeogénèse iles kerguelen salmonidae poisson sauvage [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA]Life Sciences [q-bio]/Animal biology |
spellingShingle |
gluconeogenesis environment glucose metabolism carbohydrate polar salmonids kerguelen islands glyconeogenesis glucokinase métabolisme du glucose environnement gluconeogénèse iles kerguelen salmonidae poisson sauvage [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA]Life Sciences [q-bio]/Animal biology Marandel, Lucie Gaudin, Philippe Gueraud, Francois Glise, Stéphane Herman, Alexandre Plagnes- Juan, Elisabeth Veron, Vincent Panserat, Stéphane Labonne, Jacques A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
topic_facet |
gluconeogenesis environment glucose metabolism carbohydrate polar salmonids kerguelen islands glyconeogenesis glucokinase métabolisme du glucose environnement gluconeogénèse iles kerguelen salmonidae poisson sauvage [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDV.BA]Life Sciences [q-bio]/Animal biology |
description |
International audience Salmonids belong to a high trophic level and are thus considered as strictly carnivorous species, metabolically adapted for high catabolism of proteins and low utilisation of dietary carbohydrates. However they conserved a “mammalian-type” nutritional regulation of glucokinase encoding gene and its enzymatic activity by dietary carbohydrates which remains puzzling regarding their dietary regime. The present study investigates the hypothesis that this conservation could be linked to a real consumption by trout of this nutrient in their natural habitat. To do so, brown trout were sampled in the sub-Antarctic Kerguelen Islands, a site presenting oligotrophic hydrosystems and no local freshwater fish fauna prior the introduction of salmonids fifty years ago. Qualitative and quantitative analysis of carbohydrate content within Kerguelen trout stomachs demonstrate that these animals are fed on food resources containing digestible carbohydrates. Additionally, glycaemia and more particularly gck mRNA level and gck enzymatic activity prove that Kerguelen trout digest and metabolise dietary carbohydrates. Physiological and molecular analyses performed in the present study thus strongly evidence for consumption of dietary carbohydrates by wild trout in natural environments. Investigating differences between Kerguelen individuals, we found that smaller individuals presented higher glycaemia, as well as higher carbohydrates contents in stomach. However no relationship between scaled mass index and any physiological indicator was found. Thus it appears that Kerguelen trout do not turn to carbohydrate diet because of a different condition index, or that the consumption of carbohydrates does not lead to a generally degraded physiological status. As a conclusion, our findings may explain the evolutionary conservation of a “mammalian-type” nutritional regulation of gck by dietary carbohydrates in these carnivorous fish |
author2 |
Nutrition, Métabolisme, Aquaculture (NuMéA) Institut National de la Recherche Agronomique (INRA)-Université de Pau et des Pays de l'Adour (UPPA) Ecologie Comportementale et Biologie des Populations de Poissons (ECOBIOP) This work benefited from the financial support of the Fédération de recherche MIRA (Milieu et ressources aquatiques) on behalf of University of Pau and Pays de l'Adour. This study is part of SALMEVOL 1041 program, funded by the French Polar Institute Paul Emile Victor (IPEV). |
format |
Article in Journal/Newspaper |
author |
Marandel, Lucie Gaudin, Philippe Gueraud, Francois Glise, Stéphane Herman, Alexandre Plagnes- Juan, Elisabeth Veron, Vincent Panserat, Stéphane Labonne, Jacques |
author_facet |
Marandel, Lucie Gaudin, Philippe Gueraud, Francois Glise, Stéphane Herman, Alexandre Plagnes- Juan, Elisabeth Veron, Vincent Panserat, Stéphane Labonne, Jacques |
author_sort |
Marandel, Lucie |
title |
A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
title_short |
A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
title_full |
A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
title_fullStr |
A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
title_full_unstemmed |
A reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in Kerguelen Islands |
title_sort |
reassessment of the carnivorous status of salmonids : hepatic glucokinase is expressed in wild fish in kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-01607554 https://doi.org/10.1016/j.scitotenv.2017.08.247 |
geographic |
Antarctic Kerguelen Kerguelen Islands |
geographic_facet |
Antarctic Kerguelen Kerguelen Islands |
genre |
Antarc* Antarctic Kerguelen Islands |
genre_facet |
Antarc* Antarctic Kerguelen Islands |
op_source |
ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://hal.archives-ouvertes.fr/hal-01607554 Science of the Total Environment, Elsevier, 2018, 612, pp.276-285. ⟨10.1016/j.scitotenv.2017.08.247⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2017.08.247 hal-01607554 https://hal.archives-ouvertes.fr/hal-01607554 doi:10.1016/j.scitotenv.2017.08.247 PRODINRA: 405859 WOS: 000413313700028 |
op_rights |
http://creativecommons.org/licenses/by-sa/ |
op_rightsnorm |
CC-BY-SA |
op_doi |
https://doi.org/10.1016/j.scitotenv.2017.08.247 |
container_title |
Science of The Total Environment |
container_volume |
612 |
container_start_page |
276 |
op_container_end_page |
285 |
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1766266556224897024 |