Critical indirect effects of climate change on sub-Antarctic ecosystem functioning
Sub-Antarctic islands represent critical breeding habitats for land-based top predators that dominate Southern Ocean food webs. Reproduction and molting incur high energetic demands that are sustained at the sub-Antarctic Prince Edward Islands (PEIs) by both inshore (phytoplankton blooms; "isla...
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Online Access: | https://oceanrep.geomar.de/id/eprint/22080/ https://oceanrep.geomar.de/id/eprint/22080/1/ece3678.pdf https://doi.org/10.1002/ece3.678 |
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ftoceanrep:oai:oceanrep.geomar.de:22080 2023-05-15T13:37:37+02:00 Critical indirect effects of climate change on sub-Antarctic ecosystem functioning Allan, E. L. Froneman, P. William Durgadoo, Jonathan V. McQuaid, Christopher D. Ansorge, Isabelle J. Richoux, Nicole B. 2013 text https://oceanrep.geomar.de/id/eprint/22080/ https://oceanrep.geomar.de/id/eprint/22080/1/ece3678.pdf https://doi.org/10.1002/ece3.678 en eng Wiley https://oceanrep.geomar.de/id/eprint/22080/1/ece3678.pdf Allan, E. L., Froneman, P. W., Durgadoo, J. V. , McQuaid, C. D., Ansorge, I. J. and Richoux, N. B. (2013) Critical indirect effects of climate change on sub-Antarctic ecosystem functioning. Open Access Ecology and Evolution, 3 (9). pp. 2994-3004. DOI 10.1002/ece3.678 <https://doi.org/10.1002/ece3.678>. doi:10.1002/ece3.678 cc_by info:eu-repo/semantics/openAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1002/ece3.678 2023-04-07T15:10:22Z Sub-Antarctic islands represent critical breeding habitats for land-based top predators that dominate Southern Ocean food webs. Reproduction and molting incur high energetic demands that are sustained at the sub-Antarctic Prince Edward Islands (PEIs) by both inshore (phytoplankton blooms; "island mass effect"; autochthonous) and offshore (allochthonous) productivity. As the relative contributions of these sustenance pathways are, in turn, affected by oceanographic conditions around the PEIs, we address the consequences of climatically driven changes in the physical environment on this island ecosystem. We show that there has been a measurable long-term shift in the carbon isotope signatures of the benthos inhabiting the shallow shelf region of the PEIs, most likely reflecting a long-term decline in enhanced phytoplankton productivity at the islands in response to a climate-driven shift in the position of the sub-Antarctic Front. Our results indicate that regional climate change has affected the balance between allochthonous and autochthonous productivity at the PEIs. Over the last three decades, inshore-feeding top predators at the islands have shown a marked decrease in their population sizes. Conversely, population sizes of off-shore-feeding predators that forage over great distances from the islands have remained stable or increased, with one exception. Population decline of predators that rely heavily on organisms inhabiting the inshore region strongly suggest changes in prey availability, which are likely driven by factors such as fisheries impacts on some prey populations and shifts in competitive interactions among predators. In addition to these local factors, our analysis indicates that changes in prey availability may also result indirectly through regional climate change effects on the islands' marine ecosystem. Most importantly, our results indicate that a fundamental shift in the balance between allochthonous and autochthonous trophic pathways within this island ecosystem may be detected throughout ... Article in Journal/Newspaper Antarc* Antarctic Prince Edward Islands Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Southern Ocean Ecology and Evolution 3 9 2994 3004 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Sub-Antarctic islands represent critical breeding habitats for land-based top predators that dominate Southern Ocean food webs. Reproduction and molting incur high energetic demands that are sustained at the sub-Antarctic Prince Edward Islands (PEIs) by both inshore (phytoplankton blooms; "island mass effect"; autochthonous) and offshore (allochthonous) productivity. As the relative contributions of these sustenance pathways are, in turn, affected by oceanographic conditions around the PEIs, we address the consequences of climatically driven changes in the physical environment on this island ecosystem. We show that there has been a measurable long-term shift in the carbon isotope signatures of the benthos inhabiting the shallow shelf region of the PEIs, most likely reflecting a long-term decline in enhanced phytoplankton productivity at the islands in response to a climate-driven shift in the position of the sub-Antarctic Front. Our results indicate that regional climate change has affected the balance between allochthonous and autochthonous productivity at the PEIs. Over the last three decades, inshore-feeding top predators at the islands have shown a marked decrease in their population sizes. Conversely, population sizes of off-shore-feeding predators that forage over great distances from the islands have remained stable or increased, with one exception. Population decline of predators that rely heavily on organisms inhabiting the inshore region strongly suggest changes in prey availability, which are likely driven by factors such as fisheries impacts on some prey populations and shifts in competitive interactions among predators. In addition to these local factors, our analysis indicates that changes in prey availability may also result indirectly through regional climate change effects on the islands' marine ecosystem. Most importantly, our results indicate that a fundamental shift in the balance between allochthonous and autochthonous trophic pathways within this island ecosystem may be detected throughout ... |
format |
Article in Journal/Newspaper |
author |
Allan, E. L. Froneman, P. William Durgadoo, Jonathan V. McQuaid, Christopher D. Ansorge, Isabelle J. Richoux, Nicole B. |
spellingShingle |
Allan, E. L. Froneman, P. William Durgadoo, Jonathan V. McQuaid, Christopher D. Ansorge, Isabelle J. Richoux, Nicole B. Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
author_facet |
Allan, E. L. Froneman, P. William Durgadoo, Jonathan V. McQuaid, Christopher D. Ansorge, Isabelle J. Richoux, Nicole B. |
author_sort |
Allan, E. L. |
title |
Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
title_short |
Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
title_full |
Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
title_fullStr |
Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
title_full_unstemmed |
Critical indirect effects of climate change on sub-Antarctic ecosystem functioning |
title_sort |
critical indirect effects of climate change on sub-antarctic ecosystem functioning |
publisher |
Wiley |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/22080/ https://oceanrep.geomar.de/id/eprint/22080/1/ece3678.pdf https://doi.org/10.1002/ece3.678 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Prince Edward Islands Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/22080/1/ece3678.pdf Allan, E. L., Froneman, P. W., Durgadoo, J. V. , McQuaid, C. D., Ansorge, I. J. and Richoux, N. B. (2013) Critical indirect effects of climate change on sub-Antarctic ecosystem functioning. Open Access Ecology and Evolution, 3 (9). pp. 2994-3004. DOI 10.1002/ece3.678 <https://doi.org/10.1002/ece3.678>. doi:10.1002/ece3.678 |
op_rights |
cc_by info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/ece3.678 |
container_title |
Ecology and Evolution |
container_volume |
3 |
container_issue |
9 |
container_start_page |
2994 |
op_container_end_page |
3004 |
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1766094995286130688 |