Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings
Despite the current increasing population trend, white-tailed eagles are still prone to many anthropogenic stressors. Mercury (Hg) is a very persistent naturally occurring element and apex predators as well as birds feeding on aquatic ecosystems are usually exposed to higher levels of Hg. Since glob...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/303807 2023-08-20T04:10:19+02:00 Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings Johansson, Venla Helsingin yliopisto, Eläinlääketieteellinen tiedekunta University of Helsinki, Faculty of Veterinary Medicine Helsingfors universitet, Veterinärmedicinska fakulteten 2019 application/pdf http://hdl.handle.net/10138/303807 eng eng Helsingin yliopisto University of Helsinki Helsingfors universitet URN:NBN:fi:hulib-201907033143 http://hdl.handle.net/10138/303807 Mercury Blood Clinical Chemical Parameters Dietary Ecology White-tailed eagle Feathers Eläinlääketieteen lisensiaatin koulutusohjelma Degree programme in veterinary medicine Utbildningsprogrammet i veterinärmedicin pro gradu -tutkielmat master's thesis pro gradu-avhandlingar 2019 ftunivhelsihelda 2023-07-28T06:18:04Z Despite the current increasing population trend, white-tailed eagles are still prone to many anthropogenic stressors. Mercury (Hg) is a very persistent naturally occurring element and apex predators as well as birds feeding on aquatic ecosystems are usually exposed to higher levels of Hg. Since global Hg emissions are still increasing, Hg remains as a topical health issue. The effects of mercury on wildlife have been studied extensively. Blood clinical-chemical parameters (BCCPs) can potentially be useful as biomarker endpoints for contaminant exposure. However, the effects of Hg on blood chemistry and metabolism are still poorly described. Mercury concentrations and stable isotope composition can be measured from the feathers of nestlings and the nestlings represents well the geographical area of interest. Stable isotope analyses can be used to investigate the potential dietary sources of mercury. In the experimental part we investigated the regional differences in stable isotope values, Hg concentration and BCCPs, as well as the interactions between stable isotope values and Hg exposure. We also investigated possible effects of Hg exposure on the health of WTE nestlings in three populations in Finland perceived by BCCPs. Blood and feather samples were collected from WTE nestlings in Finland during the years 2015 and 2016 in three different locations. Blood plasma was analysed for 16 different BCCPs. Feathers were analysed for total Hg concentration as well as for stable nitrogen (δ15N) and carbon (δ13C) composition. A significant difference in δ13C and δ15N values in Varsinais-Suomi and Ostrobothnia compared to Lappi was apparent and is likely to indicate variable local dietary habits. Nonetheless, the concurrent variation in δ15N and δ13C values is indicative of changes in prey composition rather than regional changes in baseline isotope signatures. We noted significantly higher Hg concentrations in Lapland population compared to the other regions. Since there was a high correlation between Hg and stable ... Master Thesis White-tailed eagle Lapland Lappi Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Mercury Blood Clinical Chemical Parameters Dietary Ecology White-tailed eagle Feathers Eläinlääketieteen lisensiaatin koulutusohjelma Degree programme in veterinary medicine Utbildningsprogrammet i veterinärmedicin |
spellingShingle |
Mercury Blood Clinical Chemical Parameters Dietary Ecology White-tailed eagle Feathers Eläinlääketieteen lisensiaatin koulutusohjelma Degree programme in veterinary medicine Utbildningsprogrammet i veterinärmedicin Johansson, Venla Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
topic_facet |
Mercury Blood Clinical Chemical Parameters Dietary Ecology White-tailed eagle Feathers Eläinlääketieteen lisensiaatin koulutusohjelma Degree programme in veterinary medicine Utbildningsprogrammet i veterinärmedicin |
description |
Despite the current increasing population trend, white-tailed eagles are still prone to many anthropogenic stressors. Mercury (Hg) is a very persistent naturally occurring element and apex predators as well as birds feeding on aquatic ecosystems are usually exposed to higher levels of Hg. Since global Hg emissions are still increasing, Hg remains as a topical health issue. The effects of mercury on wildlife have been studied extensively. Blood clinical-chemical parameters (BCCPs) can potentially be useful as biomarker endpoints for contaminant exposure. However, the effects of Hg on blood chemistry and metabolism are still poorly described. Mercury concentrations and stable isotope composition can be measured from the feathers of nestlings and the nestlings represents well the geographical area of interest. Stable isotope analyses can be used to investigate the potential dietary sources of mercury. In the experimental part we investigated the regional differences in stable isotope values, Hg concentration and BCCPs, as well as the interactions between stable isotope values and Hg exposure. We also investigated possible effects of Hg exposure on the health of WTE nestlings in three populations in Finland perceived by BCCPs. Blood and feather samples were collected from WTE nestlings in Finland during the years 2015 and 2016 in three different locations. Blood plasma was analysed for 16 different BCCPs. Feathers were analysed for total Hg concentration as well as for stable nitrogen (δ15N) and carbon (δ13C) composition. A significant difference in δ13C and δ15N values in Varsinais-Suomi and Ostrobothnia compared to Lappi was apparent and is likely to indicate variable local dietary habits. Nonetheless, the concurrent variation in δ15N and δ13C values is indicative of changes in prey composition rather than regional changes in baseline isotope signatures. We noted significantly higher Hg concentrations in Lapland population compared to the other regions. Since there was a high correlation between Hg and stable ... |
author2 |
Helsingin yliopisto, Eläinlääketieteellinen tiedekunta University of Helsinki, Faculty of Veterinary Medicine Helsingfors universitet, Veterinärmedicinska fakulteten |
format |
Master Thesis |
author |
Johansson, Venla |
author_facet |
Johansson, Venla |
author_sort |
Johansson, Venla |
title |
Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
title_short |
Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
title_full |
Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
title_fullStr |
Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
title_full_unstemmed |
Spatial Trends in Mercury Exposure, its Dietary Sources and Clinical Health Effects in Finnish White-Tailed Eagle Nestlings |
title_sort |
spatial trends in mercury exposure, its dietary sources and clinical health effects in finnish white-tailed eagle nestlings |
publisher |
Helsingin yliopisto |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/303807 |
genre |
White-tailed eagle Lapland Lappi |
genre_facet |
White-tailed eagle Lapland Lappi |
op_relation |
URN:NBN:fi:hulib-201907033143 http://hdl.handle.net/10138/303807 |
_version_ |
1774724428287967232 |