Global change effects on the long‐term feeding ecology and contaminant exposures of East Greenland polar bears
Identifieur interne : 000F02 ( Main/Merge ); précédent : 000F01; suivant : 000F03Global change effects on the long‐term feeding ecology and contaminant exposures of East Greenland polar bears
Auteurs : Melissa A. Mckinney [Canada] ; Sara J. Iverson [Canada] ; Aaron T. Fisk [Canada] ; Christian Sonne [Danemark] ; Frank F. Rigét [Danemark] ; Robert J. Letcher [Canada] ; Michael T. Arts [Canada] ; Erik W. Born ; Aqqalu Rosing-Asvid ; Rune Dietz [Danemark]Source :
- [ 1354-1013 ]
Abstract
Rapid climate changes are occurring in the Arctic, with substantial repercussions for arctic ecosystems. It is challenging to assess ecosystem changes in remote polar environments, but one successful approach has entailed monitoring the diets of upper trophic level consumers. Quantitative fatty acid signature analysis (QFASA) and fatty acid carbon isotope (δ13C‐FA) patterns were used to assess diets of East Greenland (EG) polar bears (Ursus maritimus) (n = 310) over the past three decades. QFASA‐generated diet estimates indicated that, on average, EG bears mainly consumed arctic ringed seals (47.5 ± 2.1%), migratory subarctic harp (30.6 ± 1.5%) and hooded (16.7 ± 1.3%) seals and rarely, if ever, consumed bearded seals, narwhals or walruses. Ringed seal consumption declined by 14%/decade over 28 years (90.1 ± 2.5% in 1984 to 33.9 ± 11.1% in 2011). Hooded seal consumption increased by 9.5%/decade (0.0 ± 0.0% in 1984 to 25.9 ± 9.1% in 2011). This increase may include harp seal, since hooded and harp seal FA signatures were not as well differentiated relative to other prey species. Declining δ13C‐FA ratios supported shifts from more nearshore/benthic/ice‐associated prey to more offshore/pelagic/open‐water‐associated prey, consistent with diet estimates. Increased hooded seal and decreased ringed seal consumption occurred during years when the North Atlantic Oscillation (NAO) was lower. Thus, periods with warmer temperatures and less sea ice were associated with more subarctic and less arctic seal species consumption. These changes in the relative abundance, accessibility, or distribution of arctic and subarctic marine mammals may have health consequences for EG polar bears. For example, the diet change resulted in consistently slower temporal declines in adipose levels of legacy persistent organic pollutants, as the subarctic seals have higher contaminant burdens than arctic seals. Overall, considerable changes are occurring in the EG marine ecosystem, with consequences for contaminant dynamics.
Url:
DOI: 10.1111/gcb.12241
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: 000B37
- to stream Istex, to step Curation: 000B37
- to stream Istex, to step Checkpoint: 000008
Links to Exploration step
ISTEX:61729C05F432E6586558A4E54F360596802D7AF5Le document en format XML
<record><TEI wicri:istexFullTextTei="no"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Global change effects on the long‐term feeding ecology and contaminant exposures of East Greenland polar bears</title><author><name sortKey="Mckinney, Melissa A" sort="Mckinney, Melissa A" uniqKey="Mckinney M" first="Melissa A." last="Mckinney">Melissa A. Mckinney</name></author><author><name sortKey="Iverson, Sara J" sort="Iverson, Sara J" uniqKey="Iverson S" first="Sara J." last="Iverson">Sara J. Iverson</name></author><author><name sortKey="Fisk, Aaron T" sort="Fisk, Aaron T" uniqKey="Fisk A" first="Aaron T." last="Fisk">Aaron T. Fisk</name></author><author><name sortKey="Sonne, Christian" sort="Sonne, Christian" uniqKey="Sonne C" first="Christian" last="Sonne">Christian Sonne</name></author><author><name sortKey="Riget, Frank F" sort="Riget, Frank F" uniqKey="Riget F" first="Frank F." last="Rigét">Frank F. Rigét</name></author><author><name sortKey="Letcher, Robert J" sort="Letcher, Robert J" uniqKey="Letcher R" first="Robert J." last="Letcher">Robert J. Letcher</name></author><author><name sortKey="Arts, Michael T" sort="Arts, Michael T" uniqKey="Arts M" first="Michael T." last="Arts">Michael T. Arts</name></author><author><name sortKey="Born, Erik W" sort="Born, Erik W" uniqKey="Born E" first="Erik W." last="Born">Erik W. Born</name></author><author><name sortKey="Rosing Svid, Aqqalu" sort="Rosing Svid, Aqqalu" uniqKey="Rosing Svid A" first="Aqqalu" last="Rosing-Asvid">Aqqalu Rosing-Asvid</name></author><author><name sortKey="Dietz, Rune" sort="Dietz, Rune" uniqKey="Dietz R" first="Rune" last="Dietz">Rune Dietz</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:61729C05F432E6586558A4E54F360596802D7AF5</idno><date when="2013" year="2013">2013</date><idno type="doi">10.1111/gcb.12241</idno><idno type="url">https://api-v5.istex.fr/document/61729C05F432E6586558A4E54F360596802D7AF5/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000B37</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">000B37</idno><idno type="wicri:Area/Istex/Curation">000B37</idno><idno type="wicri:Area/Istex/Checkpoint">000008</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">000008</idno><idno type="wicri:doubleKey">1354-1013:2013:Mckinney M:global:change:effects</idno><idno type="wicri:Area/Main/Merge">000F02</idno></publicationStmt><sourceDesc><biblStruct><analytic><author><name sortKey="Mckinney, Melissa A" sort="Mckinney, Melissa A" uniqKey="Mckinney M" first="Melissa A." last="Mckinney">Melissa A. Mckinney</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Biology, Dalhousie University, B3H 4R2, Halifax, NS</wicri:regionArea><wicri:noRegion>NS</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Great Lakes Institute for Environmental Research, University of Windsor, ON, N9B 3P4, Windsor</wicri:regionArea><wicri:noRegion>Windsor</wicri:noRegion></affiliation><affiliation></affiliation></author><author><name sortKey="Iverson, Sara J" sort="Iverson, Sara J" uniqKey="Iverson S" first="Sara J." last="Iverson">Sara J. Iverson</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Biology, Dalhousie University, NS, B3H 4R2, Halifax</wicri:regionArea><wicri:noRegion>Halifax</wicri:noRegion></affiliation></author><author><name sortKey="Fisk, Aaron T" sort="Fisk, Aaron T" uniqKey="Fisk A" first="Aaron T." last="Fisk">Aaron T. Fisk</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Great Lakes Institute for Environmental Research, University of Windsor, ON, N9B 3P4, Windsor</wicri:regionArea><wicri:noRegion>Windsor</wicri:noRegion></affiliation></author><author><name sortKey="Sonne, Christian" sort="Sonne, Christian" uniqKey="Sonne C" first="Christian" last="Sonne">Christian Sonne</name><affiliation wicri:level="1"><country xml:lang="fr">Danemark</country><wicri:regionArea>Department of Biological Sciences, Arctic Research Centre, Aarhus University, DK‐4000, Roskilde</wicri:regionArea><wicri:noRegion>Roskilde</wicri:noRegion></affiliation></author><author><name sortKey="Riget, Frank F" sort="Riget, Frank F" uniqKey="Riget F" first="Frank F." last="Rigét">Frank F. Rigét</name><affiliation wicri:level="1"><country xml:lang="fr">Danemark</country><wicri:regionArea>Department of Biological Sciences, Arctic Research Centre, Aarhus University, DK‐4000, Roskilde</wicri:regionArea><wicri:noRegion>Roskilde</wicri:noRegion></affiliation></author><author><name sortKey="Letcher, Robert J" sort="Letcher, Robert J" uniqKey="Letcher R" first="Robert J." last="Letcher">Robert J. Letcher</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Ecotoxicology and Wildlife Health Division, Science and Technology Branch, Environment Canada, National Wildlife Research Centre, Carleton University, ON, K1A 0H3, Ottawa</wicri:regionArea><wicri:noRegion>Ottawa</wicri:noRegion></affiliation></author><author><name sortKey="Arts, Michael T" sort="Arts, Michael T" uniqKey="Arts M" first="Michael T." last="Arts">Michael T. Arts</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Environment Canada, National Water Research Institute, ON, L7R 4A6, Burlington</wicri:regionArea><wicri:noRegion>Burlington</wicri:noRegion></affiliation></author><author><name sortKey="Born, Erik W" sort="Born, Erik W" uniqKey="Born E" first="Erik W." last="Born">Erik W. Born</name><affiliation><wicri:noCountry code="subField">Greenland</wicri:noCountry></affiliation></author><author><name sortKey="Rosing Svid, Aqqalu" sort="Rosing Svid, Aqqalu" uniqKey="Rosing Svid A" first="Aqqalu" last="Rosing-Asvid">Aqqalu Rosing-Asvid</name><affiliation><wicri:noCountry code="subField">Greenland</wicri:noCountry></affiliation></author><author><name sortKey="Dietz, Rune" sort="Dietz, Rune" uniqKey="Dietz R" first="Rune" last="Dietz">Rune Dietz</name><affiliation wicri:level="1"><country xml:lang="fr">Danemark</country><wicri:regionArea>Department of Biological Sciences, Arctic Research Centre, Aarhus University, DK‐4000, Roskilde</wicri:regionArea><wicri:noRegion>Roskilde</wicri:noRegion></affiliation></author></analytic><series><idno type="ISSN">1354-1013</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1354-1013</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">Rapid climate changes are occurring in the Arctic, with substantial repercussions for arctic ecosystems. It is challenging to assess ecosystem changes in remote polar environments, but one successful approach has entailed monitoring the diets of upper trophic level consumers. Quantitative fatty acid signature analysis (QFASA) and fatty acid carbon isotope (δ13C‐FA) patterns were used to assess diets of East Greenland (EG) polar bears (Ursus maritimus) (n = 310) over the past three decades. QFASA‐generated diet estimates indicated that, on average, EG bears mainly consumed arctic ringed seals (47.5 ± 2.1%), migratory subarctic harp (30.6 ± 1.5%) and hooded (16.7 ± 1.3%) seals and rarely, if ever, consumed bearded seals, narwhals or walruses. Ringed seal consumption declined by 14%/decade over 28 years (90.1 ± 2.5% in 1984 to 33.9 ± 11.1% in 2011). Hooded seal consumption increased by 9.5%/decade (0.0 ± 0.0% in 1984 to 25.9 ± 9.1% in 2011). This increase may include harp seal, since hooded and harp seal FA signatures were not as well differentiated relative to other prey species. Declining δ13C‐FA ratios supported shifts from more nearshore/benthic/ice‐associated prey to more offshore/pelagic/open‐water‐associated prey, consistent with diet estimates. Increased hooded seal and decreased ringed seal consumption occurred during years when the North Atlantic Oscillation (NAO) was lower. Thus, periods with warmer temperatures and less sea ice were associated with more subarctic and less arctic seal species consumption. These changes in the relative abundance, accessibility, or distribution of arctic and subarctic marine mammals may have health consequences for EG polar bears. For example, the diet change resulted in consistently slower temporal declines in adipose levels of legacy persistent organic pollutants, as the subarctic seals have higher contaminant burdens than arctic seals. Overall, considerable changes are occurring in the EG marine ecosystem, with consequences for contaminant dynamics.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Merge
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000F02 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Merge/biblio.hfd -nk 000F02 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Canada
|area= ParkinsonCanadaV1
|flux= Main
|étape= Merge
|type= RBID
|clé= ISTEX:61729C05F432E6586558A4E54F360596802D7AF5
|texte= Global change effects on the long‐term feeding ecology and contaminant exposures of East Greenland polar bears
}}
| This area was generated with Dilib version V0.6.29. |  |