Using time-depth-light recorders to measure light levels experienced by a diving marine mammal.
This study examined the feasibility of using time-depth-light recorders (TDLRs) to measure light levels experienced by a diving marine mammal. TDLRs were deployed on ten female Antarctic fur seals (Arctocephalus gazella) at Bird Island, South Georgia (54degrees00 'S 38degrees02'W) in the 1...
Published in: | Marine Biology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2004
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/using-timedepthlight-recorders-to-measure-light-levels-experienced-by-a-diving-marine-mammal(9cb039a3-1ca0-42e9-a955-9d0264835b2b).html https://doi.org/10.1007/s00227-004-1428-1 http://www.scopus.com/inward/record.url?scp=11244294623&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/9cb039a3-1ca0-42e9-a955-9d0264835b2b 2023-05-15T13:47:48+02:00 Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. McCafferty, DJ Walker, TR Boyd, Ian Lamont 2004-12 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/using-timedepthlight-recorders-to-measure-light-levels-experienced-by-a-diving-marine-mammal(9cb039a3-1ca0-42e9-a955-9d0264835b2b).html https://doi.org/10.1007/s00227-004-1428-1 http://www.scopus.com/inward/record.url?scp=11244294623&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess McCafferty , DJ , Walker , TR & Boyd , I L 2004 , ' Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. ' , Marine Biology , vol. 146 , pp. 191-199 . https://doi.org/10.1007/s00227-004-1428-1 ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA BIOOPTICAL PROPERTIES BEHAVIOR WATERS OCEAN MIGRATIONS article 2004 ftunstandrewcris https://doi.org/10.1007/s00227-004-1428-1 2021-12-26T14:12:59Z This study examined the feasibility of using time-depth-light recorders (TDLRs) to measure light levels experienced by a diving marine mammal. TDLRs were deployed on ten female Antarctic fur seals (Arctocephalus gazella) at Bird Island, South Georgia (54degrees00 'S 38degrees02'W) in the 1994 - 1995 austral summer. Depth and light measurements were made during 11 foraging trips which lasted on average ( +/- SE) 7.1 +/- 0.7 days. A total of 25,657 dives were recorded with a mean dive depth and duration of 18.0 +/- 3.6 m and 49.5 +/- 6.9 s, respectively. Depending on time of day, fur seals experienced on average 6 - 57% of the surface illumination when diving. Illuminance ranged from full sunlight (10(4) lx) at the surface to minimum starlight (10(-6) lx) at night and during deep daytime dives. TDLRs recorded strong light attenuation in the top 50 m of the water column. The mean attenuation coefficient was 0.140 +/- 0.014 m(-1), which was in the upper range of values measured by ship surveys at South Georgia. These findings suggest that TDLRs may be a useful method of obtaining information on the biooptical properties of the ocean where fur seals forage. Development of sensors with appropriate spectral sensitivity and suitable resolution at low light levels is recommended to improve the capability of these devices for the study of marine mammals. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals University of St Andrews: Research Portal Antarctic Austral Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) Starlight ENVELOPE(64.483,64.483,-70.200,-70.200) Marine Biology 146 1 191 199 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA BIOOPTICAL PROPERTIES BEHAVIOR WATERS OCEAN MIGRATIONS |
spellingShingle |
ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA BIOOPTICAL PROPERTIES BEHAVIOR WATERS OCEAN MIGRATIONS McCafferty, DJ Walker, TR Boyd, Ian Lamont Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
topic_facet |
ANTARCTIC FUR SEALS NORTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA BIOOPTICAL PROPERTIES BEHAVIOR WATERS OCEAN MIGRATIONS |
description |
This study examined the feasibility of using time-depth-light recorders (TDLRs) to measure light levels experienced by a diving marine mammal. TDLRs were deployed on ten female Antarctic fur seals (Arctocephalus gazella) at Bird Island, South Georgia (54degrees00 'S 38degrees02'W) in the 1994 - 1995 austral summer. Depth and light measurements were made during 11 foraging trips which lasted on average ( +/- SE) 7.1 +/- 0.7 days. A total of 25,657 dives were recorded with a mean dive depth and duration of 18.0 +/- 3.6 m and 49.5 +/- 6.9 s, respectively. Depending on time of day, fur seals experienced on average 6 - 57% of the surface illumination when diving. Illuminance ranged from full sunlight (10(4) lx) at the surface to minimum starlight (10(-6) lx) at night and during deep daytime dives. TDLRs recorded strong light attenuation in the top 50 m of the water column. The mean attenuation coefficient was 0.140 +/- 0.014 m(-1), which was in the upper range of values measured by ship surveys at South Georgia. These findings suggest that TDLRs may be a useful method of obtaining information on the biooptical properties of the ocean where fur seals forage. Development of sensors with appropriate spectral sensitivity and suitable resolution at low light levels is recommended to improve the capability of these devices for the study of marine mammals. |
format |
Article in Journal/Newspaper |
author |
McCafferty, DJ Walker, TR Boyd, Ian Lamont |
author_facet |
McCafferty, DJ Walker, TR Boyd, Ian Lamont |
author_sort |
McCafferty, DJ |
title |
Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
title_short |
Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
title_full |
Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
title_fullStr |
Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
title_full_unstemmed |
Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
title_sort |
using time-depth-light recorders to measure light levels experienced by a diving marine mammal. |
publishDate |
2004 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/using-timedepthlight-recorders-to-measure-light-levels-experienced-by-a-diving-marine-mammal(9cb039a3-1ca0-42e9-a955-9d0264835b2b).html https://doi.org/10.1007/s00227-004-1428-1 http://www.scopus.com/inward/record.url?scp=11244294623&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(64.483,64.483,-70.200,-70.200) |
geographic |
Antarctic Austral Bird Island Starlight |
geographic_facet |
Antarctic Austral Bird Island Starlight |
genre |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals |
genre_facet |
Antarc* Antarctic Antarctic Fur Seals Arctocephalus gazella Bird Island Elephant Seals |
op_source |
McCafferty , DJ , Walker , TR & Boyd , I L 2004 , ' Using time-depth-light recorders to measure light levels experienced by a diving marine mammal. ' , Marine Biology , vol. 146 , pp. 191-199 . https://doi.org/10.1007/s00227-004-1428-1 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00227-004-1428-1 |
container_title |
Marine Biology |
container_volume |
146 |
container_issue |
1 |
container_start_page |
191 |
op_container_end_page |
199 |
_version_ |
1766247897374916608 |