Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus
The deep scattering layers of the North Atlantic, including the Irminger Sea, contain many predators of the key copepod species Calanus. nmarchicus. Previous seasonally restricted studies have described the deep acoustic scattering layers of the Irminger Sea as 'ubiquitous'. They have show...
Published in: | Marine Biology |
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Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2005
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/spatiotemporal-variability-in-the-distribution-of-epi-and-mesopelagic-acoustic-backscatter-in-the-irminger-sea-north-atlantic-with-implications-for-predation-on-calanus-finmarchicus(fd4ccefc-98b8-4d83-af86-deae6d11f66f).html https://doi.org/10.1007/s00227-004-1510-8 http://www.scopus.com/inward/record.url?scp=18644380727&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/fd4ccefc-98b8-4d83-af86-deae6d11f66f 2023-05-15T13:35:45+02:00 Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus Anderson, C I H Brierley, A S Armstrong, F 2005-04 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/spatiotemporal-variability-in-the-distribution-of-epi-and-mesopelagic-acoustic-backscatter-in-the-irminger-sea-north-atlantic-with-implications-for-predation-on-calanus-finmarchicus(fd4ccefc-98b8-4d83-af86-deae6d11f66f).html https://doi.org/10.1007/s00227-004-1510-8 http://www.scopus.com/inward/record.url?scp=18644380727&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Anderson , C I H , Brierley , A S & Armstrong , F 2005 , ' Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus ' , Marine Biology , vol. 146 , no. 6 , pp. 1177-1188 . https://doi.org/10.1007/s00227-004-1510-8 ANTARCTIC KRILL TRANS-ATLANTIC LIFE-CYCLE DEPTH OCEAN OSCILLATION POPULATIONS SCATTERING AVOIDANCE ECOLOGY article 2005 ftunstandrewcris https://doi.org/10.1007/s00227-004-1510-8 2021-12-26T14:16:29Z The deep scattering layers of the North Atlantic, including the Irminger Sea, contain many predators of the key copepod species Calanus. nmarchicus. Previous seasonally restricted studies have described the deep acoustic scattering layers of the Irminger Sea as 'ubiquitous'. They have shown that the intensity of the acoustic backscatter varies across the region, and so, by implication, the potential predation pressure on C. nmarchicus also varies spatially. This paper reports observations of the distribution of epipelagic ( 0 - 200 m) and meso-pelagic ( 200 - 1,000 m) acoustic backscatter in the Irminger Sea, made using a scientific echosounder operating at 38 kHz during four seasonal ( winter, spring and summer) cruises. Our study demonstrates that the intensity of the backscatter varies seasonally in regionally distinct ways across the Irminger Sea. The mean acoustic backscatter, both in the upper 800 m and upper 200 m of the water column, varied significantly between the northern, central and southern areas of the central basin ('open ocean'), and within each area between the Greenland shelf slope, open ocean and Mid-Atlantic Ridge subregions. Different patterns of seasonal change in the acoustic backscatter between the upper 800 m and upper 200 m were also seen, indicating both persistent differences in the underlying amount of backscatter in each area, and varying patterns of seasonal increase in the near surface backscatter in the different areas and subregions. These observations could be related to the different oceanographic regimes encountered in each location, and are discussed in terms of their implications for potential predation pressure on C. finmarchicus. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Calanus finmarchicus Greenland North Atlantic University of St Andrews: Research Portal Antarctic Central Basin ENVELOPE(43.000,43.000,73.500,73.500) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Mid-Atlantic Ridge Marine Biology 146 6 1177 1188 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ANTARCTIC KRILL TRANS-ATLANTIC LIFE-CYCLE DEPTH OCEAN OSCILLATION POPULATIONS SCATTERING AVOIDANCE ECOLOGY |
spellingShingle |
ANTARCTIC KRILL TRANS-ATLANTIC LIFE-CYCLE DEPTH OCEAN OSCILLATION POPULATIONS SCATTERING AVOIDANCE ECOLOGY Anderson, C I H Brierley, A S Armstrong, F Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
topic_facet |
ANTARCTIC KRILL TRANS-ATLANTIC LIFE-CYCLE DEPTH OCEAN OSCILLATION POPULATIONS SCATTERING AVOIDANCE ECOLOGY |
description |
The deep scattering layers of the North Atlantic, including the Irminger Sea, contain many predators of the key copepod species Calanus. nmarchicus. Previous seasonally restricted studies have described the deep acoustic scattering layers of the Irminger Sea as 'ubiquitous'. They have shown that the intensity of the acoustic backscatter varies across the region, and so, by implication, the potential predation pressure on C. nmarchicus also varies spatially. This paper reports observations of the distribution of epipelagic ( 0 - 200 m) and meso-pelagic ( 200 - 1,000 m) acoustic backscatter in the Irminger Sea, made using a scientific echosounder operating at 38 kHz during four seasonal ( winter, spring and summer) cruises. Our study demonstrates that the intensity of the backscatter varies seasonally in regionally distinct ways across the Irminger Sea. The mean acoustic backscatter, both in the upper 800 m and upper 200 m of the water column, varied significantly between the northern, central and southern areas of the central basin ('open ocean'), and within each area between the Greenland shelf slope, open ocean and Mid-Atlantic Ridge subregions. Different patterns of seasonal change in the acoustic backscatter between the upper 800 m and upper 200 m were also seen, indicating both persistent differences in the underlying amount of backscatter in each area, and varying patterns of seasonal increase in the near surface backscatter in the different areas and subregions. These observations could be related to the different oceanographic regimes encountered in each location, and are discussed in terms of their implications for potential predation pressure on C. finmarchicus. |
format |
Article in Journal/Newspaper |
author |
Anderson, C I H Brierley, A S Armstrong, F |
author_facet |
Anderson, C I H Brierley, A S Armstrong, F |
author_sort |
Anderson, C I H |
title |
Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
title_short |
Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
title_full |
Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
title_fullStr |
Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
title_full_unstemmed |
Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus |
title_sort |
spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the irminger sea, north atlantic, with implications for predation on calanus finmarchicus |
publishDate |
2005 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/spatiotemporal-variability-in-the-distribution-of-epi-and-mesopelagic-acoustic-backscatter-in-the-irminger-sea-north-atlantic-with-implications-for-predation-on-calanus-finmarchicus(fd4ccefc-98b8-4d83-af86-deae6d11f66f).html https://doi.org/10.1007/s00227-004-1510-8 http://www.scopus.com/inward/record.url?scp=18644380727&partnerID=8YFLogxK |
long_lat |
ENVELOPE(43.000,43.000,73.500,73.500) ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Antarctic Central Basin Greenland Irminger Sea Mid-Atlantic Ridge |
geographic_facet |
Antarctic Central Basin Greenland Irminger Sea Mid-Atlantic Ridge |
genre |
Antarc* Antarctic Antarctic Krill Calanus finmarchicus Greenland North Atlantic |
genre_facet |
Antarc* Antarctic Antarctic Krill Calanus finmarchicus Greenland North Atlantic |
op_source |
Anderson , C I H , Brierley , A S & Armstrong , F 2005 , ' Spatio-temporal variability in the distribution of epi- and meso-pelagic acoustic backscatter in the Irminger Sea, North Atlantic, with implications for predation on Calanus finmarchicus ' , Marine Biology , vol. 146 , no. 6 , pp. 1177-1188 . https://doi.org/10.1007/s00227-004-1510-8 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00227-004-1510-8 |
container_title |
Marine Biology |
container_volume |
146 |
container_issue |
6 |
container_start_page |
1177 |
op_container_end_page |
1188 |
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1766069936415834112 |