Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos)
The dietary nutrient profile has metabolic significance and possibly contributes to species' foraging behavior. The brown bear (Ursus arctos) was used as a model species for which dietary ingredient and nutrient concentrations as well as nutrient ratios were determined annually, seasonally and...
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ftunivzuerich:oai:www.zora.uzh.ch:233995 2024-06-23T07:57:21+00:00 Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) De Cuyper, Annelies Strubbe, Diederik Clauss, Marcus Lens, Luc Zedrosser, Andreas Steyaert, Sam Verbist, Leen Janssens, Geert P J 2023 application/pdf https://www.zora.uzh.ch/id/eprint/233995/ https://www.zora.uzh.ch/id/eprint/233995/1/EcolEvol_brown_bear_diets_2023.pdf https://doi.org/10.5167/uzh-233995 https://doi.org/10.1002/ece3.10156 eng eng Wiley Open Access https://www.zora.uzh.ch/id/eprint/233995/1/EcolEvol_brown_bear_diets_2023.pdf doi:10.5167/uzh-233995 doi:10.1002/ece3.10156 info:pmid/37261316 urn:issn:2045-7758 info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ De Cuyper, Annelies; Strubbe, Diederik; Clauss, Marcus; Lens, Luc; Zedrosser, Andreas; Steyaert, Sam; Verbist, Leen; Janssens, Geert P J (2023). Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos). Ecology and Evolution, 13(5):e10156. Department of Small Animals 570 Life sciences biology 630 Agriculture Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivzuerich https://doi.org/10.5167/uzh-23399510.1002/ece3.10156 2024-06-05T00:26:05Z The dietary nutrient profile has metabolic significance and possibly contributes to species' foraging behavior. The brown bear (Ursus arctos) was used as a model species for which dietary ingredient and nutrient concentrations as well as nutrient ratios were determined annually, seasonally and per reproductive class. Brown bears had a vertebrate-and-ant-dominated diet in spring and early summer and a berry-dominated diet in fall, which translated into protein-rich and carbohydrate-rich diets, respectively. Fiber concentrations appeared constant over time and averaged at 25% of dry matter intake. Dietary ingredient proportions differed between reproductive classes; however, these differences did not translate into a difference in dietary nutrient concentrations, suggesting that bears manage to maintain similar nutrient profiles with selection of different ingredients. In terms of nutrient ratios, the dietary protein to non-protein ratio, considered optimal at around 0.2 (on metabolizable energy basis), averaged around 0.2 in this study in fall and around 0.8 in spring and summer. We introduced the minimal non-fat to fat ratio necessary for efficient maintenance metabolism. This ratio varied across seasons but never fell beneath the theoretically estimated minimum to ensure metabolic efficiency. This population thus managed to ingest diets that never exerted a lack of glucogenic substrate, suggesting that metabolic efficiency may either be a driver of active diet selection or that natural resources available to bears did not constitute a constraint in this respect. Given the considerable proportion of fiber in the diet of brown bears, the relevance of this nutrient and its role in foraging behavior might be underestimated. Article in Journal/Newspaper Ursus arctos University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
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Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Department of Small Animals 570 Life sciences biology 630 Agriculture |
spellingShingle |
Department of Small Animals 570 Life sciences biology 630 Agriculture De Cuyper, Annelies Strubbe, Diederik Clauss, Marcus Lens, Luc Zedrosser, Andreas Steyaert, Sam Verbist, Leen Janssens, Geert P J Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
topic_facet |
Department of Small Animals 570 Life sciences biology 630 Agriculture |
description |
The dietary nutrient profile has metabolic significance and possibly contributes to species' foraging behavior. The brown bear (Ursus arctos) was used as a model species for which dietary ingredient and nutrient concentrations as well as nutrient ratios were determined annually, seasonally and per reproductive class. Brown bears had a vertebrate-and-ant-dominated diet in spring and early summer and a berry-dominated diet in fall, which translated into protein-rich and carbohydrate-rich diets, respectively. Fiber concentrations appeared constant over time and averaged at 25% of dry matter intake. Dietary ingredient proportions differed between reproductive classes; however, these differences did not translate into a difference in dietary nutrient concentrations, suggesting that bears manage to maintain similar nutrient profiles with selection of different ingredients. In terms of nutrient ratios, the dietary protein to non-protein ratio, considered optimal at around 0.2 (on metabolizable energy basis), averaged around 0.2 in this study in fall and around 0.8 in spring and summer. We introduced the minimal non-fat to fat ratio necessary for efficient maintenance metabolism. This ratio varied across seasons but never fell beneath the theoretically estimated minimum to ensure metabolic efficiency. This population thus managed to ingest diets that never exerted a lack of glucogenic substrate, suggesting that metabolic efficiency may either be a driver of active diet selection or that natural resources available to bears did not constitute a constraint in this respect. Given the considerable proportion of fiber in the diet of brown bears, the relevance of this nutrient and its role in foraging behavior might be underestimated. |
format |
Article in Journal/Newspaper |
author |
De Cuyper, Annelies Strubbe, Diederik Clauss, Marcus Lens, Luc Zedrosser, Andreas Steyaert, Sam Verbist, Leen Janssens, Geert P J |
author_facet |
De Cuyper, Annelies Strubbe, Diederik Clauss, Marcus Lens, Luc Zedrosser, Andreas Steyaert, Sam Verbist, Leen Janssens, Geert P J |
author_sort |
De Cuyper, Annelies |
title |
Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
title_short |
Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
title_full |
Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
title_fullStr |
Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
title_full_unstemmed |
Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos) |
title_sort |
nutrient intake and its possible drivers in free-ranging european brown bears (ursus arctos arctos) |
publisher |
Wiley Open Access |
publishDate |
2023 |
url |
https://www.zora.uzh.ch/id/eprint/233995/ https://www.zora.uzh.ch/id/eprint/233995/1/EcolEvol_brown_bear_diets_2023.pdf https://doi.org/10.5167/uzh-233995 https://doi.org/10.1002/ece3.10156 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
De Cuyper, Annelies; Strubbe, Diederik; Clauss, Marcus; Lens, Luc; Zedrosser, Andreas; Steyaert, Sam; Verbist, Leen; Janssens, Geert P J (2023). Nutrient intake and its possible drivers in free-ranging European brown bears (Ursus arctos arctos). Ecology and Evolution, 13(5):e10156. |
op_relation |
https://www.zora.uzh.ch/id/eprint/233995/1/EcolEvol_brown_bear_diets_2023.pdf doi:10.5167/uzh-233995 doi:10.1002/ece3.10156 info:pmid/37261316 urn:issn:2045-7758 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5167/uzh-23399510.1002/ece3.10156 |
_version_ |
1802650956751437824 |