Investigating trophic level variability in Celtic Sea fish predators
The trophic level (TL) mean and variance, and the degree of omnivory for five Celtic Sea fish predators were estimated using a database of stomach content records characterized by a high level of taxonomic resolution. The predators occupied a high position in the food web, i.e. 4.75 for Atlantic cod...
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ftccsdartic:oai:HAL:ird-00548995v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
food web GAM indicator omnivory predation trophic level [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
food web GAM indicator omnivory predation trophic level [SDE.BE]Environmental Sciences/Biodiversity and Ecology Chassot, Emmanuel Rouyer, Tristan Trenkel, Verena M. Gascuel, Didier Investigating trophic level variability in Celtic Sea fish predators |
topic_facet |
food web GAM indicator omnivory predation trophic level [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
The trophic level (TL) mean and variance, and the degree of omnivory for five Celtic Sea fish predators were estimated using a database of stomach content records characterized by a high level of taxonomic resolution. The predators occupied a high position in the food web, i.e. 4.75 for Atlantic cod Gadus morhua, 4.44 for haddock Melanogrammus aeglefinus, 4.88 for European hake Merluccius merluccius, 5.00 for megrim Lepidorhombus whiffiagonis and 5.27 for whiting (Merlangius merlangus). The level of taxonomic resolution of the prey did not greatly affect mean TL predator values; an effect on variance was evident, low resolution masking intra-population variability in TL. Generalized additive models were used to explain the variability of predator TL caused by environmental variables (ICES subdivision, season) and predator characteristics (length). Significant year, location, season, and interaction effects were found for some species and with length at the scale of ICES subdivision. The species specific variability of TL could be due to spatio-temporal variations in prey availability and/or in predator selectivity following ontogenetic changes. Omnivorous fish TL was less affected by spatio-temporal variations. In addition, results showed that the omnivory index and TL variability provide dissimilar information on predator feeding strategy. Combining information on TL variability and omnivory allowed us to separate between within-individual and between-individual components contributing to trophic niche width and to identify the type of generalization of fish predators. |
author2 |
Laboratoire d'Ecologie Halieutique - Agrocampus Ouest Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) UMR 212 EME "écosystèmes marins exploités" (EME) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM) Écologie et Modèles pour l'Halieutique (IFREMER EMH) Institut Français de Recherche pour l'Exploitation de la Mer - Atlantique (IFREMER Atlantique) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Chassot, Emmanuel Rouyer, Tristan Trenkel, Verena M. Gascuel, Didier |
author_facet |
Chassot, Emmanuel Rouyer, Tristan Trenkel, Verena M. Gascuel, Didier |
author_sort |
Chassot, Emmanuel |
title |
Investigating trophic level variability in Celtic Sea fish predators |
title_short |
Investigating trophic level variability in Celtic Sea fish predators |
title_full |
Investigating trophic level variability in Celtic Sea fish predators |
title_fullStr |
Investigating trophic level variability in Celtic Sea fish predators |
title_full_unstemmed |
Investigating trophic level variability in Celtic Sea fish predators |
title_sort |
investigating trophic level variability in celtic sea fish predators |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.ird.fr/ird-00548995 https://hal.ird.fr/ird-00548995/document https://hal.ird.fr/ird-00548995/file/Chassot_al-fig-captions-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig2-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig3-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig4-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig5-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig6-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-MS-JFB-final-cor-edition.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab2-cor.pdf https://doi.org/10.1111/j.1095-8649.2008.01938.x |
long_lat |
ENVELOPE(-57.955,-57.955,-61.923,-61.923) ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Gam Hake |
geographic_facet |
Gam Hake |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
ISSN: 0022-1112 EISSN: 1095-8649 Journal of Fish Biology https://hal.ird.fr/ird-00548995 Journal of Fish Biology, Wiley, 2008, 73 (4), pp.763-781. ⟨10.1111/j.1095-8649.2008.01938.x⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8649.2008.01938.x ird-00548995 https://hal.ird.fr/ird-00548995 https://hal.ird.fr/ird-00548995/document https://hal.ird.fr/ird-00548995/file/Chassot_al-fig-captions-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig2-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig3-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig4-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig5-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig6-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-MS-JFB-final-cor-edition.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab2-cor.pdf doi:10.1111/j.1095-8649.2008.01938.x IRD: fdi:010051239 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/j.1095-8649.2008.01938.x |
container_title |
Journal of Fish Biology |
container_volume |
73 |
container_issue |
4 |
container_start_page |
763 |
op_container_end_page |
781 |
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1766358094112096256 |
spelling |
ftccsdartic:oai:HAL:ird-00548995v1 2023-05-15T15:27:40+02:00 Investigating trophic level variability in Celtic Sea fish predators Chassot, Emmanuel Rouyer, Tristan Trenkel, Verena M. Gascuel, Didier Laboratoire d'Ecologie Halieutique - Agrocampus Ouest Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) UMR 212 EME "écosystèmes marins exploités" (EME) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM) Écologie et Modèles pour l'Halieutique (IFREMER EMH) Institut Français de Recherche pour l'Exploitation de la Mer - Atlantique (IFREMER Atlantique) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2008 https://hal.ird.fr/ird-00548995 https://hal.ird.fr/ird-00548995/document https://hal.ird.fr/ird-00548995/file/Chassot_al-fig-captions-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig2-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig3-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig4-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig5-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig6-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-MS-JFB-final-cor-edition.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab2-cor.pdf https://doi.org/10.1111/j.1095-8649.2008.01938.x en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1095-8649.2008.01938.x ird-00548995 https://hal.ird.fr/ird-00548995 https://hal.ird.fr/ird-00548995/document https://hal.ird.fr/ird-00548995/file/Chassot_al-fig-captions-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig2-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig3-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig4-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig5-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-fig6-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-MS-JFB-final-cor-edition.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab1-cor.pdf https://hal.ird.fr/ird-00548995/file/Chassot_al-Tab2-cor.pdf doi:10.1111/j.1095-8649.2008.01938.x IRD: fdi:010051239 info:eu-repo/semantics/OpenAccess ISSN: 0022-1112 EISSN: 1095-8649 Journal of Fish Biology https://hal.ird.fr/ird-00548995 Journal of Fish Biology, Wiley, 2008, 73 (4), pp.763-781. ⟨10.1111/j.1095-8649.2008.01938.x⟩ food web GAM indicator omnivory predation trophic level [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2008 ftccsdartic https://doi.org/10.1111/j.1095-8649.2008.01938.x 2021-12-12T05:53:56Z The trophic level (TL) mean and variance, and the degree of omnivory for five Celtic Sea fish predators were estimated using a database of stomach content records characterized by a high level of taxonomic resolution. The predators occupied a high position in the food web, i.e. 4.75 for Atlantic cod Gadus morhua, 4.44 for haddock Melanogrammus aeglefinus, 4.88 for European hake Merluccius merluccius, 5.00 for megrim Lepidorhombus whiffiagonis and 5.27 for whiting (Merlangius merlangus). The level of taxonomic resolution of the prey did not greatly affect mean TL predator values; an effect on variance was evident, low resolution masking intra-population variability in TL. Generalized additive models were used to explain the variability of predator TL caused by environmental variables (ICES subdivision, season) and predator characteristics (length). Significant year, location, season, and interaction effects were found for some species and with length at the scale of ICES subdivision. The species specific variability of TL could be due to spatio-temporal variations in prey availability and/or in predator selectivity following ontogenetic changes. Omnivorous fish TL was less affected by spatio-temporal variations. In addition, results showed that the omnivory index and TL variability provide dissimilar information on predator feeding strategy. Combining information on TL variability and omnivory allowed us to separate between within-individual and between-individual components contributing to trophic niche width and to identify the type of generalization of fish predators. Article in Journal/Newspaper atlantic cod Gadus morhua Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Gam ENVELOPE(-57.955,-57.955,-61.923,-61.923) Hake ENVELOPE(15.612,15.612,66.797,66.797) Journal of Fish Biology 73 4 763 781 |