Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet

Using top predators as sentinels of the marine environment, Hg contamination was investigated within the large subantarctic seabird community of the Kerguelen Islands, a remote and poorly known area located in the Southern Indian Ocean. Focusing on chicks (21 species), Hg analysis pointed out large...

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Main Author:	Blévin, Pierre - Joel
Other Authors:	Cherel, Yves
Language:	English
Published:	2015
Subjects:	Biomagnification Contamination Kerguelen Southern Ocean Stable isotopes Trophic level
Online Access:	https://vsmart.lib.aegean.gr/webopac/List.csp?SearchT1=Bl%C3%A9vin%2C+Pierre&Index1=Keywordsbib&Database=1&SearchMethod=Find_1&SearchTerm1=Bl%C3%A9vin%2C+Pierre&OpacLanguage=gre&Profile=Default&EncodedRequest=m9C9A8MBF225DCcC491867FLs&EncodedQuery=m9C9A8MBF225DCcC491867FLs&Source=SysQR&PageType=Start&PreviousList=RecordListFind&WebPageNr=1&NumberToRetrieve=50&WebAction=NewSearch&StartValue=0&RowRepeat=0&ExtraInfo=&SortIndex=Year&SortDirection=-1&Resource=&SavingIndicator=&RestrType=&RestrTerms=&RestrShowAll=&LinkToIndex= http://hdl.handle.net/11610/11688
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author	Blévin, Pierre - Joel
author2	Cherel, Yves
author_facet	Cherel, Yves Blévin, Pierre - Joel
author_sort	Blévin, Pierre - Joel
collection	DSpace
description	Using top predators as sentinels of the marine environment, Hg contamination was investigated within the large subantarctic seabird community of the Kerguelen Islands, a remote and poorly known area located in the Southern Indian Ocean. Focusing on chicks (21 species), Hg analysis pointed out large inter-specific variations in body feather Hg concentrations, which ranged from 0.08 ± 0.01 to 5.31 ± 1.12 μg∙g-1 dry mass. Seabirds from Kerguelen thus encompass the whole range of chick feather Hg values that were previously collected worldwide. Using stable isotopes, the effects of foraging habitat (reflected by 13C) and trophic positions (reflected by 15N) on Hg concentrations were then investigated. A multivariate analysis showed that the species-related Hg variations were highly and positively linked to feather 15N values, thus highlighting biomagnification processes occurring throughout the subantarctic marine trophic webs. By contrast, Hg contamination overall correlated poorly with seabird foraging habitat. However, when focusing on oceanic species, seabird Hg concentration was related to feather 13C values, with species feeding in colder waters south of Kerguelen Islands being less prone to be contaminated than species feeding in northern warmer waters. In conclusion, the study emphasizes the global effect of anthropogenic Hg emission that is detectable in remote subantarctic islands. Those isolated localities therefore appear as ideal study sites to monitor the temporal trends of global Hg contamination, with the help of some carefully selected seabird species
id	oai:hellanicus.lib.aegean.gr:11610-11688
institution	Hellanicus
language	English
publishDate	2015
record_format	dspace
spelling	oai:hellanicus.lib.aegean.gr:11610-116882021-01-22T13:59:13Z Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet Blévin, Pierre - Joel Cherel, Yves Biomagnification Contamination Kerguelen Southern Ocean Stable isotopes Trophic level Using top predators as sentinels of the marine environment, Hg contamination was investigated within the large subantarctic seabird community of the Kerguelen Islands, a remote and poorly known area located in the Southern Indian Ocean. Focusing on chicks (21 species), Hg analysis pointed out large inter-specific variations in body feather Hg concentrations, which ranged from 0.08 ± 0.01 to 5.31 ± 1.12 μg∙g-1 dry mass. Seabirds from Kerguelen thus encompass the whole range of chick feather Hg values that were previously collected worldwide. Using stable isotopes, the effects of foraging habitat (reflected by 13C) and trophic positions (reflected by 15N) on Hg concentrations were then investigated. A multivariate analysis showed that the species-related Hg variations were highly and positively linked to feather 15N values, thus highlighting biomagnification processes occurring throughout the subantarctic marine trophic webs. By contrast, Hg contamination overall correlated poorly with seabird foraging habitat. However, when focusing on oceanic species, seabird Hg concentration was related to feather 13C values, with species feeding in colder waters south of Kerguelen Islands being less prone to be contaminated than species feeding in northern warmer waters. In conclusion, the study emphasizes the global effect of anthropogenic Hg emission that is detectable in remote subantarctic islands. Those isolated localities therefore appear as ideal study sites to monitor the temporal trends of global Hg contamination, with the help of some carefully selected seabird species 2015-11-18T09:46:06Z 2015-11-18T09:46:06Z 2012 https://vsmart.lib.aegean.gr/webopac/List.csp?SearchT1=Bl%C3%A9vin%2C+Pierre&Index1=Keywordsbib&Database=1&SearchMethod=Find_1&SearchTerm1=Bl%C3%A9vin%2C+Pierre&OpacLanguage=gre&Profile=Default&EncodedRequest=m9C9A8MBF225DCcC491867FLs&EncodedQuery=m9C9A8MBF225DCcC491867FLs&Source=SysQR&PageType=Start&PreviousList=RecordListFind&WebPageNr=1&NumberToRetrieve=50&WebAction=NewSearch&StartValue=0&RowRepeat=0&ExtraInfo=&SortIndex=Year&SortDirection=-1&Resource=&SavingIndicator=&RestrType=&RestrTerms=&RestrShowAll=&LinkToIndex= http://hdl.handle.net/11610/11688 en application/pdf Μυτιλήνη
spellingShingle	Biomagnification Contamination Kerguelen Southern Ocean Stable isotopes Trophic level Blévin, Pierre - Joel Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title	Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title_full	Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title_fullStr	Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title_full_unstemmed	Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title_short	Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet
title_sort	mercury in a community of subantarctic seabirds chick feather concentrations and influence of foraging habitat and diet
topic	Biomagnification Contamination Kerguelen Southern Ocean Stable isotopes Trophic level
url	https://vsmart.lib.aegean.gr/webopac/List.csp?SearchT1=Bl%C3%A9vin%2C+Pierre&Index1=Keywordsbib&Database=1&SearchMethod=Find_1&SearchTerm1=Bl%C3%A9vin%2C+Pierre&OpacLanguage=gre&Profile=Default&EncodedRequest=m9C9A8MBF225DCcC491867FLs&EncodedQuery=m9C9A8MBF225DCcC491867FLs&Source=SysQR&PageType=Start&PreviousList=RecordListFind&WebPageNr=1&NumberToRetrieve=50&WebAction=NewSearch&StartValue=0&RowRepeat=0&ExtraInfo=&SortIndex=Year&SortDirection=-1&Resource=&SavingIndicator=&RestrType=&RestrTerms=&RestrShowAll=&LinkToIndex= http://hdl.handle.net/11610/11688
work_keys_str_mv	AT blevinpierrejoel mercuryinacommunityofsubantarcticseabirdschickfeatherconcentrationsandinfluenceofforaginghabitatanddiet

Mercury in a community of subantarctic seabirds: Chick feather concentrations and influence of foraging habitat and diet

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