Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds
The Arctic, and Svalbard in particular, is experiencing a more rapid warming compared to the global average. Such Atlantification of the Arctic may change food webs in a way that can also affect the contaminant levels in top predators such as seabirds. Studies have found that the black-legged kittiw...
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The University of Bergen
2022
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ftunivbergen:oai:bora.uib.no:11250/2985681 2023-05-15T14:41:20+02:00 Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds Stople, Torunn 2022-02-25T23:00:26Z application/pdf https://hdl.handle.net/11250/2985681 eng eng The University of Bergen https://hdl.handle.net/11250/2985681 Copyright the Author. All rights reserved sentinel dietary ecology Black legged kittiwake persistent organic pollutants marine Borealization climate change contaminant exposure Rissa tridactyla stable isotopes 751999 Master thesis 2022 ftunivbergen 2023-03-14T17:41:13Z The Arctic, and Svalbard in particular, is experiencing a more rapid warming compared to the global average. Such Atlantification of the Arctic may change food webs in a way that can also affect the contaminant levels in top predators such as seabirds. Studies have found that the black-legged kittiwake (Rissa tridactyla) in Kongsfjorden, Svalbard, has changed its diet from mainly Arctic prey items towards a more mixed diet with contribution from Atlantic species since 2007. Atlantic species might function as biovectors, bringing contaminants into the Arctic from more contaminated areas. However, Arctic species might have a higher contaminant load, due their high lipid content. My thesis explored if changes observed in dietary ecology, using two different approaches, can explain variability in black-legged kittiwake exposure to organochlorine contaminants during the years 2007-2020, here represented by seven compounds including polychlorinated biphenyl (PCB) 99, PCB 153, PCB 180, β-hexachlorocyclohexane, hexachlorobenzene, p,p’- dichlorodiphenyldichloroethylene (DDE), and oxychlordane. Dietary ecology was quantified by both frequency of occurrence of diet items and groups from regurgitate samples and by stable isotope analysis. Stable nitrogen isotope values (δ 15N) have been established as a proxy for trophic position, and stable carbon isotope values (δ 13C) indicate foraging habitat and primary carbon source. Annual variation in frequency of occurrence of prey species (or groups) did not explain the variation in either δ 13C or δ 15N values. There were significant differences in the annual variations in contaminants levels, but there was no clear temporal trend for any contaminants during the study period. Model selection showed that neither diet items nor stable isotope values explained the variation in contaminant levels. Instead, the null-model, with year as a random effect factor, was often ranked as a strong model. However, some variables, such as trophic level, carbon source and frequency of occurrence ... Master Thesis Arctic Black-legged Kittiwake Climate change Kongsfjord* Kongsfjorden rissa tridactyla Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Svalbard |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
sentinel dietary ecology Black legged kittiwake persistent organic pollutants marine Borealization climate change contaminant exposure Rissa tridactyla stable isotopes 751999 |
spellingShingle |
sentinel dietary ecology Black legged kittiwake persistent organic pollutants marine Borealization climate change contaminant exposure Rissa tridactyla stable isotopes 751999 Stople, Torunn Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
topic_facet |
sentinel dietary ecology Black legged kittiwake persistent organic pollutants marine Borealization climate change contaminant exposure Rissa tridactyla stable isotopes 751999 |
description |
The Arctic, and Svalbard in particular, is experiencing a more rapid warming compared to the global average. Such Atlantification of the Arctic may change food webs in a way that can also affect the contaminant levels in top predators such as seabirds. Studies have found that the black-legged kittiwake (Rissa tridactyla) in Kongsfjorden, Svalbard, has changed its diet from mainly Arctic prey items towards a more mixed diet with contribution from Atlantic species since 2007. Atlantic species might function as biovectors, bringing contaminants into the Arctic from more contaminated areas. However, Arctic species might have a higher contaminant load, due their high lipid content. My thesis explored if changes observed in dietary ecology, using two different approaches, can explain variability in black-legged kittiwake exposure to organochlorine contaminants during the years 2007-2020, here represented by seven compounds including polychlorinated biphenyl (PCB) 99, PCB 153, PCB 180, β-hexachlorocyclohexane, hexachlorobenzene, p,p’- dichlorodiphenyldichloroethylene (DDE), and oxychlordane. Dietary ecology was quantified by both frequency of occurrence of diet items and groups from regurgitate samples and by stable isotope analysis. Stable nitrogen isotope values (δ 15N) have been established as a proxy for trophic position, and stable carbon isotope values (δ 13C) indicate foraging habitat and primary carbon source. Annual variation in frequency of occurrence of prey species (or groups) did not explain the variation in either δ 13C or δ 15N values. There were significant differences in the annual variations in contaminants levels, but there was no clear temporal trend for any contaminants during the study period. Model selection showed that neither diet items nor stable isotope values explained the variation in contaminant levels. Instead, the null-model, with year as a random effect factor, was often ranked as a strong model. However, some variables, such as trophic level, carbon source and frequency of occurrence ... |
format |
Master Thesis |
author |
Stople, Torunn |
author_facet |
Stople, Torunn |
author_sort |
Stople, Torunn |
title |
Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
title_short |
Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
title_full |
Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
title_fullStr |
Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
title_full_unstemmed |
Is a warmer Arctic a more contaminated Arctic? Atlantification of Kongsfjorden in relation to contaminant levels in seabirds |
title_sort |
is a warmer arctic a more contaminated arctic? atlantification of kongsfjorden in relation to contaminant levels in seabirds |
publisher |
The University of Bergen |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/2985681 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Black-legged Kittiwake Climate change Kongsfjord* Kongsfjorden rissa tridactyla Svalbard |
genre_facet |
Arctic Black-legged Kittiwake Climate change Kongsfjord* Kongsfjorden rissa tridactyla Svalbard |
op_relation |
https://hdl.handle.net/11250/2985681 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766313120608813056 |