Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill
Interannual variability is a characteristic feature of the Southern Ocean ecosystem, yet the relative roles of biological and physical processes in generating these fluctuations are unknown. There is now extensive evidence that there are years when there is a very low abundance of Antarctic krill (E...
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/interannual-variability-of-the-south-georgia-marine-ecosystem-biological-and-physical-sources-of-variation-in-the-abundance-of-krill(d14a744a-5ec1-4edf-9949-dd5a250e0ffc).html http://www.scopus.com/inward/record.url?scp=0032420809&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/d14a744a-5ec1-4edf-9949-dd5a250e0ffc 2024-06-23T07:45:48+00:00 Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill Murphy, EJ Watkins, JL Reid, K Trathan, PN Everson, I Croxall, JP Priddle, J Brandon, MA Brierley, Andrew Stuart Hofmann, E 1998-09 https://research-portal.st-andrews.ac.uk/en/researchoutput/interannual-variability-of-the-south-georgia-marine-ecosystem-biological-and-physical-sources-of-variation-in-the-abundance-of-krill(d14a744a-5ec1-4edf-9949-dd5a250e0ffc).html http://www.scopus.com/inward/record.url?scp=0032420809&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/interannual-variability-of-the-south-georgia-marine-ecosystem-biological-and-physical-sources-of-variation-in-the-abundance-of-krill(d14a744a-5ec1-4edf-9949-dd5a250e0ffc).html info:eu-repo/semantics/restrictedAccess Murphy , EJ , Watkins , JL , Reid , K , Trathan , PN , Everson , I , Croxall , JP , Priddle , J , Brandon , MA , Brierley , A S & Hofmann , E 1998 , ' Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill ' , Fisheries Oceanography , vol. 7 , pp. 381-390 . ecosystem interannual variability krill models Southern Ocean transport ANTARCTIC PENGUIN POPULATIONS SEA-ICE EXTENT MACKEREL ICEFISH TEMPERATURE DIET article 1998 ftunstandrewcris 2024-06-13T00:07:09Z Interannual variability is a characteristic feature of the Southern Ocean ecosystem, yet the relative roles of biological and physical processes in generating these fluctuations are unknown. There is now extensive evidence that there are years when there is a very low abundance of Antarctic krill (Euphausia superba) in the South Georgia area, and that this variation affects much of the ecosystem, with the most obvious impacts on survival and breeding success of some of the major predators on krill. The open nature of the South Georgia ecosystem means this variability has large-scale relevance, but even though there are unique time series of data available, information on some key processes is limited. Fluctuations in year-class success in parts, or all, of the krill population across the Scotia Sea can generate large changes in the available biomass. The ocean transport pathways maintain the large-scale ecosystem structure by moving krill over large distances to areas where they are available to predator colonies. This large-scale physical system shows strong spatial and temporal coherence in the patterns of the interannual and subdecadal variability. This physical variability affects both the population dynamics of krill and the transport pathways, emphasizing that both the causes and the consequences of events at South Georgia are part of much larger-scale processes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Icefish Scotia Sea Sea ice Southern Ocean University of St Andrews: Research Portal Antarctic Scotia Sea Southern Ocean |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ecosystem interannual variability krill models Southern Ocean transport ANTARCTIC PENGUIN POPULATIONS SEA-ICE EXTENT MACKEREL ICEFISH TEMPERATURE DIET |
spellingShingle |
ecosystem interannual variability krill models Southern Ocean transport ANTARCTIC PENGUIN POPULATIONS SEA-ICE EXTENT MACKEREL ICEFISH TEMPERATURE DIET Murphy, EJ Watkins, JL Reid, K Trathan, PN Everson, I Croxall, JP Priddle, J Brandon, MA Brierley, Andrew Stuart Hofmann, E Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
topic_facet |
ecosystem interannual variability krill models Southern Ocean transport ANTARCTIC PENGUIN POPULATIONS SEA-ICE EXTENT MACKEREL ICEFISH TEMPERATURE DIET |
description |
Interannual variability is a characteristic feature of the Southern Ocean ecosystem, yet the relative roles of biological and physical processes in generating these fluctuations are unknown. There is now extensive evidence that there are years when there is a very low abundance of Antarctic krill (Euphausia superba) in the South Georgia area, and that this variation affects much of the ecosystem, with the most obvious impacts on survival and breeding success of some of the major predators on krill. The open nature of the South Georgia ecosystem means this variability has large-scale relevance, but even though there are unique time series of data available, information on some key processes is limited. Fluctuations in year-class success in parts, or all, of the krill population across the Scotia Sea can generate large changes in the available biomass. The ocean transport pathways maintain the large-scale ecosystem structure by moving krill over large distances to areas where they are available to predator colonies. This large-scale physical system shows strong spatial and temporal coherence in the patterns of the interannual and subdecadal variability. This physical variability affects both the population dynamics of krill and the transport pathways, emphasizing that both the causes and the consequences of events at South Georgia are part of much larger-scale processes. |
format |
Article in Journal/Newspaper |
author |
Murphy, EJ Watkins, JL Reid, K Trathan, PN Everson, I Croxall, JP Priddle, J Brandon, MA Brierley, Andrew Stuart Hofmann, E |
author_facet |
Murphy, EJ Watkins, JL Reid, K Trathan, PN Everson, I Croxall, JP Priddle, J Brandon, MA Brierley, Andrew Stuart Hofmann, E |
author_sort |
Murphy, EJ |
title |
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
title_short |
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
title_full |
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
title_fullStr |
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
title_full_unstemmed |
Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
title_sort |
interannual variability of the south georgia marine ecosystem: biological and physical sources of variation in the abundance of krill |
publishDate |
1998 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/interannual-variability-of-the-south-georgia-marine-ecosystem-biological-and-physical-sources-of-variation-in-the-abundance-of-krill(d14a744a-5ec1-4edf-9949-dd5a250e0ffc).html http://www.scopus.com/inward/record.url?scp=0032420809&partnerID=8YFLogxK |
geographic |
Antarctic Scotia Sea Southern Ocean |
geographic_facet |
Antarctic Scotia Sea Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Icefish Scotia Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Icefish Scotia Sea Sea ice Southern Ocean |
op_source |
Murphy , EJ , Watkins , JL , Reid , K , Trathan , PN , Everson , I , Croxall , JP , Priddle , J , Brandon , MA , Brierley , A S & Hofmann , E 1998 , ' Interannual variability of the South Georgia marine ecosystem: biological and physical sources of variation in the abundance of krill ' , Fisheries Oceanography , vol. 7 , pp. 381-390 . |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/interannual-variability-of-the-south-georgia-marine-ecosystem-biological-and-physical-sources-of-variation-in-the-abundance-of-krill(d14a744a-5ec1-4edf-9949-dd5a250e0ffc).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1802642396979134464 |