Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea.
Accepted manuscript version. Published version available in Environmental Research 2017, 158: 94-104. As apex predators, polar bears (Ursus maritimus) are among the most heavily polluted organisms in the Arctic. In addition to this anthropogenic stressor, climate warming has been shown to negatively...
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Online Access: | https://hdl.handle.net/10037/12267 https://doi.org/10.1016/j.envres.2017.05.034 |
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ftunivtroemsoe:oai:munin.uit.no:10037/12267 2023-05-15T15:15:45+02:00 Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. Bourgeon, Sophie Riemer, Astrid Kolind Tartu, Sabrina Aars, Jon Polder, Anuschka Jenssen, Bjørn Munro Routti, Heli Anna Irmeli 2017-06-11 https://hdl.handle.net/10037/12267 https://doi.org/10.1016/j.envres.2017.05.034 eng eng Elsevier Environmental Research info:eu-repo/grantAgreement/RCN/POLARPROG/216568/NORWAY/Synergistic effects of sea ice-free periods and contaminant exposure on energy metabolism in polar bears// Bourgeon, S., Riemer, A. K., Tartu, S., Aars, J., Polder, A., Jenssen, B. M. & Routti, H. A. I. (2017). Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. Environmental Research,158:94-104. FRIDAID 1475304 doi:10.1016/j.envres.2017.05.034 0013-9351 1096-0953 https://hdl.handle.net/10037/12267 openAccess VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økotoksikologi: 489 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecotoxicology: 489 Breeding status Climate change Fasting Organochlorines Perfluoroalkyl substances Journal article Tidsskriftartikkel Peer reviewed 2017 ftunivtroemsoe https://doi.org/10.1016/j.envres.2017.05.034 2021-06-25T17:55:18Z Accepted manuscript version. Published version available in Environmental Research 2017, 158: 94-104. As apex predators, polar bears (Ursus maritimus) are among the most heavily polluted organisms in the Arctic. In addition to this anthropogenic stressor, climate warming has been shown to negatively affect their body condition, reproductive output and survival. Among potential underlying physiological mechanisms, thyroid hormones (THs), which control thermoregulation, metabolism and reproduction, can be affected by a variety of both natural and anthropogenic factors. While THs have been extensively used as proxies for pollution exposure in mammals, including polar bears, there is a lack of knowledge of their natural variations. In this context, we examined seasonal variations in body condition and circulating TH concentrations in free-ranging female polar bears. Females with variable reproductive status (i.e., solitary, with cubs of the year or with yearlings) were sampled from locations with contrasted sea ice conditions. Furthermore, we studied THs in relation to levels of organo-halogenated contaminants. As predicted, solitary females were in better condition than females caring for offspring, especially in spring. In addition, TH levels were lower in autumn compared to spring, although this seasonal effect was mainly observed in solitary females. Finally, the negative relationships between organochlorine and perfluoroalkyl substances and some THs suggest a possible alteration of homeostasis of THs. Since the latter relationships were only observed during spring, we emphasize the importance of considering the ecological factors when using THs as proxies for pollution exposure. Yet, the combined effects of natural and anthropogenic stressors on THs might impair the ability of polar bears to adapt to ongoing climate changes. Article in Journal/Newspaper Arctic Barents Sea Climate change Sea ice Ursus maritimus University of Tromsø: Munin Open Research Archive Arctic Barents Sea Environmental Research 158 94 104 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økotoksikologi: 489 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecotoxicology: 489 Breeding status Climate change Fasting Organochlorines Perfluoroalkyl substances |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økotoksikologi: 489 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecotoxicology: 489 Breeding status Climate change Fasting Organochlorines Perfluoroalkyl substances Bourgeon, Sophie Riemer, Astrid Kolind Tartu, Sabrina Aars, Jon Polder, Anuschka Jenssen, Bjørn Munro Routti, Heli Anna Irmeli Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økotoksikologi: 489 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecotoxicology: 489 Breeding status Climate change Fasting Organochlorines Perfluoroalkyl substances |
description |
Accepted manuscript version. Published version available in Environmental Research 2017, 158: 94-104. As apex predators, polar bears (Ursus maritimus) are among the most heavily polluted organisms in the Arctic. In addition to this anthropogenic stressor, climate warming has been shown to negatively affect their body condition, reproductive output and survival. Among potential underlying physiological mechanisms, thyroid hormones (THs), which control thermoregulation, metabolism and reproduction, can be affected by a variety of both natural and anthropogenic factors. While THs have been extensively used as proxies for pollution exposure in mammals, including polar bears, there is a lack of knowledge of their natural variations. In this context, we examined seasonal variations in body condition and circulating TH concentrations in free-ranging female polar bears. Females with variable reproductive status (i.e., solitary, with cubs of the year or with yearlings) were sampled from locations with contrasted sea ice conditions. Furthermore, we studied THs in relation to levels of organo-halogenated contaminants. As predicted, solitary females were in better condition than females caring for offspring, especially in spring. In addition, TH levels were lower in autumn compared to spring, although this seasonal effect was mainly observed in solitary females. Finally, the negative relationships between organochlorine and perfluoroalkyl substances and some THs suggest a possible alteration of homeostasis of THs. Since the latter relationships were only observed during spring, we emphasize the importance of considering the ecological factors when using THs as proxies for pollution exposure. Yet, the combined effects of natural and anthropogenic stressors on THs might impair the ability of polar bears to adapt to ongoing climate changes. |
format |
Article in Journal/Newspaper |
author |
Bourgeon, Sophie Riemer, Astrid Kolind Tartu, Sabrina Aars, Jon Polder, Anuschka Jenssen, Bjørn Munro Routti, Heli Anna Irmeli |
author_facet |
Bourgeon, Sophie Riemer, Astrid Kolind Tartu, Sabrina Aars, Jon Polder, Anuschka Jenssen, Bjørn Munro Routti, Heli Anna Irmeli |
author_sort |
Bourgeon, Sophie |
title |
Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
title_short |
Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
title_full |
Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
title_fullStr |
Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
title_full_unstemmed |
Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. |
title_sort |
potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (ursus maritimus) from the barents sea. |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://hdl.handle.net/10037/12267 https://doi.org/10.1016/j.envres.2017.05.034 |
geographic |
Arctic Barents Sea |
geographic_facet |
Arctic Barents Sea |
genre |
Arctic Barents Sea Climate change Sea ice Ursus maritimus |
genre_facet |
Arctic Barents Sea Climate change Sea ice Ursus maritimus |
op_relation |
Environmental Research info:eu-repo/grantAgreement/RCN/POLARPROG/216568/NORWAY/Synergistic effects of sea ice-free periods and contaminant exposure on energy metabolism in polar bears// Bourgeon, S., Riemer, A. K., Tartu, S., Aars, J., Polder, A., Jenssen, B. M. & Routti, H. A. I. (2017). Potentiation of ecological factors on the disruption of thyroid hormones by organo-halogenated contaminants in female polar bears (Ursus maritimus) from the Barents Sea. Environmental Research,158:94-104. FRIDAID 1475304 doi:10.1016/j.envres.2017.05.034 0013-9351 1096-0953 https://hdl.handle.net/10037/12267 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1016/j.envres.2017.05.034 |
container_title |
Environmental Research |
container_volume |
158 |
container_start_page |
94 |
op_container_end_page |
104 |
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1766346085742149632 |