Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures
Abstract Depth data from archival tagging studies of cod (Gadus morhua) were used in three different analyses with the aim of testing basic assumptions of cod behaviour. Examination of post-release depth profiles from cod tagged in the Barents, North, and Irish Seas revealed that some cod underwent...
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croxfordunivpr:10.1016/j.icesjms.2004.07.003 2023-12-31T10:07:02+01:00 Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures Heffernan, O. Righton, D. Michalsen, K. 2004 http://dx.doi.org/10.1016/j.icesjms.2004.07.003 http://academic.oup.com/icesjms/article-pdf/61/7/1062/29121897/61-7-1062.pdf en eng Oxford University Press (OUP) ICES Journal of Marine Science volume 61, issue 7, page 1062-1070 ISSN 1095-9289 1054-3139 Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2004 croxfordunivpr https://doi.org/10.1016/j.icesjms.2004.07.003 2023-12-06T08:45:01Z Abstract Depth data from archival tagging studies of cod (Gadus morhua) were used in three different analyses with the aim of testing basic assumptions of cod behaviour. Examination of post-release depth profiles from cod tagged in the Barents, North, and Irish Seas revealed that some cod underwent a post-release period of adaptation to increasing depth as they readjusted their buoyancy to its pre-tagging level. This depth adaptation behaviour was characterized by gradually increasing mean depth, and enabled the calculation of neutral-buoyancy compliant descent rates, which were less than 1 m h−1. Estimated rates of vertical movement were shown to be highly dependent upon the frequency at which depth was sampled. Maximum estimated rates of ascent and descent from sampling intervals of 10 or 15 min were inconsistent with the maintenance of neutral buoyancy, but estimates from sampling intervals greater than 1 h were not. Calculation of tilt angles using depth data sampled at 10-s intervals showed that cod were often tilted more than 5° relative to the horizontal, and that this effect was more pronounced at night. These findings suggest that basic assumptions regarding cod physiology and behaviour require revision if the accuracy and precision of acoustic methods are to be improved. Article in Journal/Newspaper Gadus morhua Oxford University Press (via Crossref) ICES Journal of Marine Science 61 7 1062 1070 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography Heffernan, O. Righton, D. Michalsen, K. Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
topic_facet |
Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Depth data from archival tagging studies of cod (Gadus morhua) were used in three different analyses with the aim of testing basic assumptions of cod behaviour. Examination of post-release depth profiles from cod tagged in the Barents, North, and Irish Seas revealed that some cod underwent a post-release period of adaptation to increasing depth as they readjusted their buoyancy to its pre-tagging level. This depth adaptation behaviour was characterized by gradually increasing mean depth, and enabled the calculation of neutral-buoyancy compliant descent rates, which were less than 1 m h−1. Estimated rates of vertical movement were shown to be highly dependent upon the frequency at which depth was sampled. Maximum estimated rates of ascent and descent from sampling intervals of 10 or 15 min were inconsistent with the maintenance of neutral buoyancy, but estimates from sampling intervals greater than 1 h were not. Calculation of tilt angles using depth data sampled at 10-s intervals showed that cod were often tilted more than 5° relative to the horizontal, and that this effect was more pronounced at night. These findings suggest that basic assumptions regarding cod physiology and behaviour require revision if the accuracy and precision of acoustic methods are to be improved. |
format |
Article in Journal/Newspaper |
author |
Heffernan, O. Righton, D. Michalsen, K. |
author_facet |
Heffernan, O. Righton, D. Michalsen, K. |
author_sort |
Heffernan, O. |
title |
Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
title_short |
Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
title_full |
Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
title_fullStr |
Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
title_full_unstemmed |
Use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
title_sort |
use of data storage tags to quantify vertical movements of cod: effects on acoustic measures |
publisher |
Oxford University Press (OUP) |
publishDate |
2004 |
url |
http://dx.doi.org/10.1016/j.icesjms.2004.07.003 http://academic.oup.com/icesjms/article-pdf/61/7/1062/29121897/61-7-1062.pdf |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
ICES Journal of Marine Science volume 61, issue 7, page 1062-1070 ISSN 1095-9289 1054-3139 |
op_doi |
https://doi.org/10.1016/j.icesjms.2004.07.003 |
container_title |
ICES Journal of Marine Science |
container_volume |
61 |
container_issue |
7 |
container_start_page |
1062 |
op_container_end_page |
1070 |
_version_ |
1786839273568206848 |