Persistent organic pollutants in great skuas Stercorarius skua
The bioaccumulation of persistent organic pollutants (POPs) is of particular environmental concern in top predators, which accumulate high concentrations of POPs that can cause adverse effects. Previous small scale studies found high concentrations of POPs in adult great skuas, Stercorarius skua, a...
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ftunivglasthes:oai:theses.gla.ac.uk:4192 2023-05-15T16:23:01+02:00 Persistent organic pollutants in great skuas Stercorarius skua Leat, Eliza Helen Kelsey 2013 http://theses.gla.ac.uk/4192/ https://eleanor.lib.gla.ac.uk/record=b2979065 unknown Leat, Eliza Helen Kelsey (2013) Persistent organic pollutants in great skuas Stercorarius skua. PhD thesis, University of Glasgow. QL Zoology Thesis NonPeerReviewed 2013 ftunivglasthes 2021-09-12T17:22:52Z The bioaccumulation of persistent organic pollutants (POPs) is of particular environmental concern in top predators, which accumulate high concentrations of POPs that can cause adverse effects. Previous small scale studies found high concentrations of POPs in adult great skuas, Stercorarius skua, a top predator in the marine environment. This thesis investigates the factors affecting concentrations and patterns of POPs (contribution of individual POPs to the ΣPOPs) in the great skua across its breeding range in the north-east Atlantic. Clear differences between colonies in both concentration and pattern of POPs in adult plasma were not indicative of being caused by long range transport of POPs in the atmosphere. Variation in diet between colonies is the mostly likely explanation for these colony differences, with great skuas from some colonies having a greater proportion of fish in their diet whilst others eat more seabird prey. Although seabirds are often used in studies of POPs in the environment, the effect of migratory behaviour has not previously been studied in detail. By using a combination of global location sensor (GLS) loggers and feather stable isotopes from winter grown feathers, the wintering areas of individuals from three breeding populations of great skuas were identified. Great skuas spend the winter in three distinct areas across the North Atlantic, with birds from the same breeding colonies wintering in different areas. In two of the three breeding populations, wintering area explained a significant proportion of variation in organochlorines (OCs) concentrations and pattern. However in the colony with the highest concentrations of OCs, no effect of wintering area was found, possibly as a result of these great skuas feeding at a higher trophic level during the breeding season than other populations. Temporally, concentrations of OCs were higher in 1980 than 2008 in eggs, whilst newer contaminants polybrominated diphenyl ethers (PBDEs) and perfluorinated chemicals (PFASs) show the opposite trend. In conclusion, concentrations of POPs in the great skua were influenced primarily by breeding season diet with wintering area and sex also having small but significant effects on POPs. Wintering area explained the most variation in the pattern of POPs in great skuas. The POP concentrations found in this study exceeded those which have been found to cause adverse effects on the immune system and reproduction in other species of seabird. Thesis Great skua North Atlantic North East Atlantic Stercorarius skua University of Glasgow: Glasgow Theses Service |
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University of Glasgow: Glasgow Theses Service |
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unknown |
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QL Zoology |
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QL Zoology Leat, Eliza Helen Kelsey Persistent organic pollutants in great skuas Stercorarius skua |
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QL Zoology |
description |
The bioaccumulation of persistent organic pollutants (POPs) is of particular environmental concern in top predators, which accumulate high concentrations of POPs that can cause adverse effects. Previous small scale studies found high concentrations of POPs in adult great skuas, Stercorarius skua, a top predator in the marine environment. This thesis investigates the factors affecting concentrations and patterns of POPs (contribution of individual POPs to the ΣPOPs) in the great skua across its breeding range in the north-east Atlantic. Clear differences between colonies in both concentration and pattern of POPs in adult plasma were not indicative of being caused by long range transport of POPs in the atmosphere. Variation in diet between colonies is the mostly likely explanation for these colony differences, with great skuas from some colonies having a greater proportion of fish in their diet whilst others eat more seabird prey. Although seabirds are often used in studies of POPs in the environment, the effect of migratory behaviour has not previously been studied in detail. By using a combination of global location sensor (GLS) loggers and feather stable isotopes from winter grown feathers, the wintering areas of individuals from three breeding populations of great skuas were identified. Great skuas spend the winter in three distinct areas across the North Atlantic, with birds from the same breeding colonies wintering in different areas. In two of the three breeding populations, wintering area explained a significant proportion of variation in organochlorines (OCs) concentrations and pattern. However in the colony with the highest concentrations of OCs, no effect of wintering area was found, possibly as a result of these great skuas feeding at a higher trophic level during the breeding season than other populations. Temporally, concentrations of OCs were higher in 1980 than 2008 in eggs, whilst newer contaminants polybrominated diphenyl ethers (PBDEs) and perfluorinated chemicals (PFASs) show the opposite trend. In conclusion, concentrations of POPs in the great skua were influenced primarily by breeding season diet with wintering area and sex also having small but significant effects on POPs. Wintering area explained the most variation in the pattern of POPs in great skuas. The POP concentrations found in this study exceeded those which have been found to cause adverse effects on the immune system and reproduction in other species of seabird. |
format |
Thesis |
author |
Leat, Eliza Helen Kelsey |
author_facet |
Leat, Eliza Helen Kelsey |
author_sort |
Leat, Eliza Helen Kelsey |
title |
Persistent organic pollutants in great skuas Stercorarius skua |
title_short |
Persistent organic pollutants in great skuas Stercorarius skua |
title_full |
Persistent organic pollutants in great skuas Stercorarius skua |
title_fullStr |
Persistent organic pollutants in great skuas Stercorarius skua |
title_full_unstemmed |
Persistent organic pollutants in great skuas Stercorarius skua |
title_sort |
persistent organic pollutants in great skuas stercorarius skua |
publishDate |
2013 |
url |
http://theses.gla.ac.uk/4192/ https://eleanor.lib.gla.ac.uk/record=b2979065 |
genre |
Great skua North Atlantic North East Atlantic Stercorarius skua |
genre_facet |
Great skua North Atlantic North East Atlantic Stercorarius skua |
op_relation |
Leat, Eliza Helen Kelsey (2013) Persistent organic pollutants in great skuas Stercorarius skua. PhD thesis, University of Glasgow. |
_version_ |
1766011174096207872 |