Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic
Studies on glaucous gulls (Larus hyperboreus) breeding in the Barents Sea have reported that high blood levels of halogenated organic contaminants in this species might cause reproductive, behavioral, and developmental stress. However, potential endocrine system modulation caused by contaminant expo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.276.4589 2023-05-15T14:55:53+02:00 Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic Breeding Glaucous Gulls Larus Hyperboreus The Pennsylvania State University CiteSeerX Archives application/zip http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.276.4589 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.276.4589 Metadata may be used without restrictions as long as the oai identifier remains attached to it. ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/50/d6/Environ_Health_Perspect_2004_Apr_112(5)_532-537.tar.gz text ftciteseerx 2016-01-07T20:50:50Z Studies on glaucous gulls (Larus hyperboreus) breeding in the Barents Sea have reported that high blood levels of halogenated organic contaminants in this species might cause reproductive, behavioral, and developmental stress. However, potential endocrine system modulation caused by contaminant exposure has yet not been reported in this Arctic apical predator. In this present study we aimed to investigate whether the current levels of a selection of organochlorines (OCs) were associated with altered circulating levels of thyroid hormones (THs) in free-ranging adult glaucous gulls breeding at Bear Island in the Barents Sea. Blood concentrations of 14 polychlorinated biphenyls, hexachlorobenzene (HCB), oxychlordane, and p,p´-dichlorodiphenyldichloroethylene (p,p´-DDE) were quantified, in addition to free and total thyroxine (T 4) and triiodothyronine (T 3), in plasma of 66 glaucous gulls in the spring of 2001. Negative correlations were found between plasma levels of T 4 and T 4:T 3 ratio, and blood levels of OCs in male glaucous gulls. Despite their relatively low contribution to the total OC fraction, HCB and oxychlordane were the most prominent compounds in terms of their negative effect on the variation of the T 4:T 3 ratio. Moreover, lower T 4 levels and T 4:T 3 ratios were measured in glaucous gulls breeding in a colony exposed to high levels of OCs, compared with a less exposed colony. Levels of T 3 were elevated in the high-OC–exposed colony. This may indicate that the glaucous gull is susceptible to changes to TH homeostasis mediated by exposure to halogenated organic contaminants. Key words: Arctic, contaminant, endocrine disruption, glaucous gull, organochlorine, T 3, T 4, thyroid hormone. Environ Health Perspect 112:532–537 (2004). doi:10.1289/ehp.6756 available via Text Arctic Barents Sea Bear Island Glaucous Gull Larus hyperboreus Unknown Arctic Barents Sea Bear Island ENVELOPE(-67.250,-67.250,-68.151,-68.151) |
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English |
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Studies on glaucous gulls (Larus hyperboreus) breeding in the Barents Sea have reported that high blood levels of halogenated organic contaminants in this species might cause reproductive, behavioral, and developmental stress. However, potential endocrine system modulation caused by contaminant exposure has yet not been reported in this Arctic apical predator. In this present study we aimed to investigate whether the current levels of a selection of organochlorines (OCs) were associated with altered circulating levels of thyroid hormones (THs) in free-ranging adult glaucous gulls breeding at Bear Island in the Barents Sea. Blood concentrations of 14 polychlorinated biphenyls, hexachlorobenzene (HCB), oxychlordane, and p,p´-dichlorodiphenyldichloroethylene (p,p´-DDE) were quantified, in addition to free and total thyroxine (T 4) and triiodothyronine (T 3), in plasma of 66 glaucous gulls in the spring of 2001. Negative correlations were found between plasma levels of T 4 and T 4:T 3 ratio, and blood levels of OCs in male glaucous gulls. Despite their relatively low contribution to the total OC fraction, HCB and oxychlordane were the most prominent compounds in terms of their negative effect on the variation of the T 4:T 3 ratio. Moreover, lower T 4 levels and T 4:T 3 ratios were measured in glaucous gulls breeding in a colony exposed to high levels of OCs, compared with a less exposed colony. Levels of T 3 were elevated in the high-OC–exposed colony. This may indicate that the glaucous gull is susceptible to changes to TH homeostasis mediated by exposure to halogenated organic contaminants. Key words: Arctic, contaminant, endocrine disruption, glaucous gull, organochlorine, T 3, T 4, thyroid hormone. Environ Health Perspect 112:532–537 (2004). doi:10.1289/ehp.6756 available via |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Breeding Glaucous Gulls Larus Hyperboreus |
spellingShingle |
Breeding Glaucous Gulls Larus Hyperboreus Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
author_facet |
Breeding Glaucous Gulls Larus Hyperboreus |
author_sort |
Breeding Glaucous Gulls |
title |
Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
title_short |
Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
title_full |
Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
title_fullStr |
Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
title_full_unstemmed |
Research | Article Effects of Organochlorine Contaminants on Thyroid Hormone Levels in Arctic |
title_sort |
research | article effects of organochlorine contaminants on thyroid hormone levels in arctic |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.276.4589 |
long_lat |
ENVELOPE(-67.250,-67.250,-68.151,-68.151) |
geographic |
Arctic Barents Sea Bear Island |
geographic_facet |
Arctic Barents Sea Bear Island |
genre |
Arctic Barents Sea Bear Island Glaucous Gull Larus hyperboreus |
genre_facet |
Arctic Barents Sea Bear Island Glaucous Gull Larus hyperboreus |
op_source |
ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/50/d6/Environ_Health_Perspect_2004_Apr_112(5)_532-537.tar.gz |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.276.4589 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766327902802018304 |