Upside-down swimming behaviour of free-ranging narwhals
Abstract Background Free-ranging narwhals ( Monodon monoceros ) were instrumented in Admiralty Inlet, Canada with both satellite tags to study migration and stock separation and short-term, high-resolution digital archival tags to explore diving and feeding behaviour. Three narwhals were equipped wi...
Published in: | BMC Ecology |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
BMC
2007
|
Subjects: | |
Online Access: | https://doi.org/10.1186/1472-6785-7-14 https://doaj.org/article/efe172ef0d364a84afdb3c91881674cc |
id |
ftdoajarticles:oai:doaj.org/article:efe172ef0d364a84afdb3c91881674cc |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:efe172ef0d364a84afdb3c91881674cc 2023-05-15T17:13:06+02:00 Upside-down swimming behaviour of free-ranging narwhals Richard Pierre Tyack Peter L Orr Jack Bakhtiari Mehdi Shapiro Ari D Dietz Rune Eskesen Ida Marshall Greg 2007-11-01T00:00:00Z https://doi.org/10.1186/1472-6785-7-14 https://doaj.org/article/efe172ef0d364a84afdb3c91881674cc EN eng BMC http://www.biomedcentral.com/1472-6785/7/14 https://doaj.org/toc/1472-6785 doi:10.1186/1472-6785-7-14 1472-6785 https://doaj.org/article/efe172ef0d364a84afdb3c91881674cc BMC Ecology, Vol 7, Iss 1, p 14 (2007) Ecology QH540-549.5 article 2007 ftdoajarticles https://doi.org/10.1186/1472-6785-7-14 2022-12-31T09:11:29Z Abstract Background Free-ranging narwhals ( Monodon monoceros ) were instrumented in Admiralty Inlet, Canada with both satellite tags to study migration and stock separation and short-term, high-resolution digital archival tags to explore diving and feeding behaviour. Three narwhals were equipped with an underwater camera pod (Crittercam), another individual was equipped with a digital archival tag (DTAG), and a fifth with both units during August 2003 and 2004. Results Crittercam footage indicated that of the combined 286 minutes of recordings, 12% of the time was spent along the bottom. When the bottom was visible in the camera footage, the narwhals were oriented upside-down 80% of the time (range: 61100%). The DTAG data (14.6 hours of recordings) revealed that during time spent below the surface, the two tagged narwhals were supine an average of 13% (range: 9–18%) of the time. Roughly 70% of this time spent in a supine posture occurred during the descent. Conclusion Possible reasons for this upside-down swimming behaviour are discussed. No preference for a clockwise or counter-clockwise direction of roll was observed, discounting the possibility that rolling movements contribute to the asymmetric left-handed helical turns of the tusk. Article in Journal/Newspaper Monodon monoceros narwhal* Directory of Open Access Journals: DOAJ Articles Admiralty Inlet ENVELOPE(-86.000,-86.000,72.501,72.501) Canada The Tusk ENVELOPE(-168.250,-168.250,-84.867,-84.867) BMC Ecology 7 1 14 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 |
spellingShingle |
Ecology QH540-549.5 Richard Pierre Tyack Peter L Orr Jack Bakhtiari Mehdi Shapiro Ari D Dietz Rune Eskesen Ida Marshall Greg Upside-down swimming behaviour of free-ranging narwhals |
topic_facet |
Ecology QH540-549.5 |
description |
Abstract Background Free-ranging narwhals ( Monodon monoceros ) were instrumented in Admiralty Inlet, Canada with both satellite tags to study migration and stock separation and short-term, high-resolution digital archival tags to explore diving and feeding behaviour. Three narwhals were equipped with an underwater camera pod (Crittercam), another individual was equipped with a digital archival tag (DTAG), and a fifth with both units during August 2003 and 2004. Results Crittercam footage indicated that of the combined 286 minutes of recordings, 12% of the time was spent along the bottom. When the bottom was visible in the camera footage, the narwhals were oriented upside-down 80% of the time (range: 61100%). The DTAG data (14.6 hours of recordings) revealed that during time spent below the surface, the two tagged narwhals were supine an average of 13% (range: 9–18%) of the time. Roughly 70% of this time spent in a supine posture occurred during the descent. Conclusion Possible reasons for this upside-down swimming behaviour are discussed. No preference for a clockwise or counter-clockwise direction of roll was observed, discounting the possibility that rolling movements contribute to the asymmetric left-handed helical turns of the tusk. |
format |
Article in Journal/Newspaper |
author |
Richard Pierre Tyack Peter L Orr Jack Bakhtiari Mehdi Shapiro Ari D Dietz Rune Eskesen Ida Marshall Greg |
author_facet |
Richard Pierre Tyack Peter L Orr Jack Bakhtiari Mehdi Shapiro Ari D Dietz Rune Eskesen Ida Marshall Greg |
author_sort |
Richard Pierre |
title |
Upside-down swimming behaviour of free-ranging narwhals |
title_short |
Upside-down swimming behaviour of free-ranging narwhals |
title_full |
Upside-down swimming behaviour of free-ranging narwhals |
title_fullStr |
Upside-down swimming behaviour of free-ranging narwhals |
title_full_unstemmed |
Upside-down swimming behaviour of free-ranging narwhals |
title_sort |
upside-down swimming behaviour of free-ranging narwhals |
publisher |
BMC |
publishDate |
2007 |
url |
https://doi.org/10.1186/1472-6785-7-14 https://doaj.org/article/efe172ef0d364a84afdb3c91881674cc |
long_lat |
ENVELOPE(-86.000,-86.000,72.501,72.501) ENVELOPE(-168.250,-168.250,-84.867,-84.867) |
geographic |
Admiralty Inlet Canada The Tusk |
geographic_facet |
Admiralty Inlet Canada The Tusk |
genre |
Monodon monoceros narwhal* |
genre_facet |
Monodon monoceros narwhal* |
op_source |
BMC Ecology, Vol 7, Iss 1, p 14 (2007) |
op_relation |
http://www.biomedcentral.com/1472-6785/7/14 https://doaj.org/toc/1472-6785 doi:10.1186/1472-6785-7-14 1472-6785 https://doaj.org/article/efe172ef0d364a84afdb3c91881674cc |
op_doi |
https://doi.org/10.1186/1472-6785-7-14 |
container_title |
BMC Ecology |
container_volume |
7 |
container_issue |
1 |
container_start_page |
14 |
_version_ |
1766070008057692160 |