Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis
Fatty acids have been widely used as trophic biomarkers in marine mammals. However, for the South American sea lion, the most abundant otariid in the eastern South Pacific, there is no information about blubber fatty acids and their link to diet. Here, we compare fatty acid profiles of sea lions fro...
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ftunivchile:oai:repositorio.uchile.cl:2250/177869 2023-05-15T18:09:55+02:00 Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis Guerrero, Alicia I. Pavez Díaz, Guido Santos Carvallo, Macarena Rogers, Tracey L. Sepúlveda, Maritza 2020 application/pdf https://doi.org/10.1038/s41598-020-62178-6 https://repositorio.uchile.cl/handle/2250/177869 en eng Nature Scientific Reports (2020) 10:5725 doi:10.1038/s41598-020-62178-6 https://repositorio.uchile.cl/handle/2250/177869 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Scientific Reports Signature analysis Stable-isotope Feeding ecology Salmo-salar Diet Flavescens Predator Stratification Profiles Tissues Artículo de revista 2020 ftunivchile https://doi.org/10.1038/s41598-020-62178-6 2022-12-25T00:51:48Z Fatty acids have been widely used as trophic biomarkers in marine mammals. However, for the South American sea lion, the most abundant otariid in the eastern South Pacific, there is no information about blubber fatty acids and their link to diet. Here, we compare fatty acid profiles of sea lions from two distinct oceanographic regions in northern and southern Chile. Their fatty acids vary greatly between regions, suggesting dietary differences at a spatial scale. The fatty acid C22:6 omega 3 was more abundant in sea lions from the northern region, likely associated with consumption of anchovy, cephalopods, and crustaceans, which are rich in that fatty acid, and have been reported as their main prey items. Sea lions from the southern region were richer in C22:1 and C20:1, characteristic of teleost fish, suggesting a piscivorous diet. Males displayed a more diverse fatty acid composition than females, suggesting a wider trophic niche. Few individual sea lions within the southern region had unusually high levels of C18:2 omega 6, commonly found in terrestrial environments. This suggests consumption of farmed salmon, whose diet is usually based on terrestrial sources. This demonstrates how human intervention is being reflected in the tissues of a top predator in a natural environment. Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 3180433 Scott Foundation CONICYT-PCHA 2016-21161109 FIP 2014-28 Article in Journal/Newspaper Salmo salar Universidad de Chile: Repositorio académico Pacific Scientific Reports 10 1 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Signature analysis Stable-isotope Feeding ecology Salmo-salar Diet Flavescens Predator Stratification Profiles Tissues |
spellingShingle |
Signature analysis Stable-isotope Feeding ecology Salmo-salar Diet Flavescens Predator Stratification Profiles Tissues Guerrero, Alicia I. Pavez Díaz, Guido Santos Carvallo, Macarena Rogers, Tracey L. Sepúlveda, Maritza Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
topic_facet |
Signature analysis Stable-isotope Feeding ecology Salmo-salar Diet Flavescens Predator Stratification Profiles Tissues |
description |
Fatty acids have been widely used as trophic biomarkers in marine mammals. However, for the South American sea lion, the most abundant otariid in the eastern South Pacific, there is no information about blubber fatty acids and their link to diet. Here, we compare fatty acid profiles of sea lions from two distinct oceanographic regions in northern and southern Chile. Their fatty acids vary greatly between regions, suggesting dietary differences at a spatial scale. The fatty acid C22:6 omega 3 was more abundant in sea lions from the northern region, likely associated with consumption of anchovy, cephalopods, and crustaceans, which are rich in that fatty acid, and have been reported as their main prey items. Sea lions from the southern region were richer in C22:1 and C20:1, characteristic of teleost fish, suggesting a piscivorous diet. Males displayed a more diverse fatty acid composition than females, suggesting a wider trophic niche. Few individual sea lions within the southern region had unusually high levels of C18:2 omega 6, commonly found in terrestrial environments. This suggests consumption of farmed salmon, whose diet is usually based on terrestrial sources. This demonstrates how human intervention is being reflected in the tissues of a top predator in a natural environment. Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT) CONICYT FONDECYT 3180433 Scott Foundation CONICYT-PCHA 2016-21161109 FIP 2014-28 |
format |
Article in Journal/Newspaper |
author |
Guerrero, Alicia I. Pavez Díaz, Guido Santos Carvallo, Macarena Rogers, Tracey L. Sepúlveda, Maritza |
author_facet |
Guerrero, Alicia I. Pavez Díaz, Guido Santos Carvallo, Macarena Rogers, Tracey L. Sepúlveda, Maritza |
author_sort |
Guerrero, Alicia I. |
title |
Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
title_short |
Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
title_full |
Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
title_fullStr |
Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
title_full_unstemmed |
Foraging behaviour of the South American sea lion (Otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
title_sort |
foraging behaviour of the south american sea lion (otaria byronia) in two disparate ecosystems assessed through blubber fatty acid analysis |
publisher |
Nature |
publishDate |
2020 |
url |
https://doi.org/10.1038/s41598-020-62178-6 https://repositorio.uchile.cl/handle/2250/177869 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Salmo salar |
genre_facet |
Salmo salar |
op_source |
Scientific Reports |
op_relation |
Scientific Reports (2020) 10:5725 doi:10.1038/s41598-020-62178-6 https://repositorio.uchile.cl/handle/2250/177869 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1038/s41598-020-62178-6 |
container_title |
Scientific Reports |
container_volume |
10 |
container_issue |
1 |
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1766182621537107968 |